JPH07229861A - Radiation analyzer - Google Patents

Abstract

PURPOSE:To improve both of energy resolution and a counting rate. CONSTITUTION:The radiation analyzer is a radiation analyzer provided with an energy measurement system 20 for measuring energy of radiation (for instance, fluorescence X-ray) generated from a sample with pulse wave height and an event recognition system 10 for discriminating a pulse mutual time and acting upon the energy measurement system because of eliminating an unnecessary pulse. The event recognition system 10 is provided with a discrimination circuit 13 for discriminating energy on the basis of a pule and a switching means 30 for actuating so as not to input the unnecessary pulse to the energy measurement system 20 on the basis of an energy discrimination result or a time discrimination result in the event recognition system 10 on the input side of the energy measurement system 20 is provided therein.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation analyzer capable of measuring a trace component in a sample with high accuracy by measuring a pulse having a wave height proportional to the energy of radiation at a high count rate. Here, X-rays, α rays,
Although there are analyzers for β-rays, γ-rays, etc., for convenience of description, a case where the present invention is applied to an energy dispersive fluorescent X-ray analyzer among X-ray analyzers will be described below. The present invention can be applied to the various radiation analyzers described above.

[0002]

2. Description of the Related Art FIG. 16 is a block diagram showing a conventional technique of this type of fluorescent X-ray analyzer. In the figure, 10
Reference numeral 1 denotes a semiconductor detector, and this detector 101 outputs a voltage pulse having a wave height proportional to the energy of the fluorescent X-ray generated from the sample. This pulse is converted by a preamplifier 102, which is an integrator, into a staircase voltage whose height of each step is proportional to the energy of the fluorescent X-ray, and the analyzer 11
Entered in 2.

The staircase voltage includes a signal having a magnitude proportional to the energy of fluorescent X-rays, resistance noise of the detector 101 superimposed on the signal, and noise due to the field effect transistor forming the preamplifier 102. Therefore, in order to remove these noises and improve the energy resolution, the energy is input to the energy measuring system 107 in which the frequency band of the signal to be measured is narrowed (the pulse width of the shaped waveform is widened).

In the energy measuring system 107, the shaping circuit 108 having a large time constant converts the input staircase wave voltage into a pulse having a length from the crest to the wave tail of t _d . Here, t _d is called dead time or process time. Since the pulse height of the output pulse of the shaping circuit 108 corresponds to the energy of the fluorescent X-ray, the kind of the trace component can be specified from the pulse height of the pulse, and the concentration of the trace component can be measured from the pulse number. You can Since the energy measuring system 107 has the shaping circuit 108 having a large time constant, it is also called a slow channel.

On the other hand, since the generation of fluorescent X-rays from the sample is random, the number of pulses generated per unit time increases, and as the average count rate approaches 1 / t _d , the energy measuring system 107 shapes the pulse. The pulse intervals appearing are shorter than t _d . As a result, two pulse waveforms generated before and after overlap (this phenomenon is referred to as pile-up), which causes a problem that energy measurement accuracy is lowered and pulses are erroneously counted. Therefore,
To remove this pileup, _let t _{d be,} for example, 1 /
A system having a function of forming a pulse width of 10 or less and a function of discriminating whether or not an interval of events of pulse input is t _d or less based on the pulse width, that is, a time discrimination function is required.

Reference numeral 106 in FIG. 16 is an event recognition system that fulfills this function, and it is called a first channel because it has a shaping circuit 103 having a smaller time constant than the shaping circuit 108. In the event recognition system 106, a time discrimination circuit 104 for discriminating whether or not two pulse inputs, that is, an event interval is t _d or less is provided on the output side of the shaping circuit 103, and the pileup removal circuit 105 is provided on the output side thereof. Is provided. Based on the output signal of the time discriminating circuit 104, the removing circuit 105 prevents the A / D in the energy measuring system 107 from taking in these pulses when the interval between the preceding and following pulses is t _d or less.
An instruction is given to the conversion circuit 110, or the linear gate circuit 109 on the output side of the shaping circuit 108 is directly controlled so that these pulses are not input to the A / D conversion circuit 110.

A baseline compensation signal BLR is input from the time discrimination circuit 104 to the shaping circuit 108. When the output pulse of the shaping circuit 108 undershoots, this compensation signal causes the pulse height of the next pulse to rise from a level lower than the baseline of the voltage, resulting in a pulse height different from the actual value. ,
To prevent this, it is a timing signal sent to correct the baseline when the next pulse is input within a predetermined time interval.

When measuring the energy of fluorescent X-rays, such as when measuring the concentration of constituent atoms of a sample, only the peak of a specific spectrum is of interest depending on the purpose of the measurement. May be. In addition, it may not always be necessary to capture the entire data for a measurement target with a lot of background. Here, FIG. 17 shows a spectrum in the case where the constituent atoms of petroleum are subjected to fluorescent X-ray analysis. In this measurement, the peak of the sulfur component S-Kα for measuring the concentration of sulfur, and this peak is influenced by the composition ratio of carbon and hydrogen in the sample.
Of the other argon component Ar-Kα,
The iron component Fe-Kα or the like is unnecessary.

In such a case, conventionally, the number of single channel analyzers (not shown) corresponding to each component is provided, and the A / D converter 110 is operated by this analyzer to obtain only the data of the necessary component A / D. The method of D conversion is adopted. Further, as shown in FIG. 16, there is also a method in which a digital gate 111 is provided on the output side of the A / D converter 110 and the digital gate 111 is opened / closed to store only the data of a necessary component in the memory 112. However, in any of these methods, much of the data measured by the shaping circuit 108 having a large time constant is discarded, and as a result, it takes a lot of time to process unnecessary data. Therefore, it will not be possible to sufficiently measure various data.

[0010]

As described above, conventionally, when the energy resolution is increased, the time constant of the shaping circuit in the energy measuring system becomes long, and the dead time t _d must be made long. On the other hand, if the dead time t _d is long, the probability of pile-up increases, and a high count rate cannot be obtained. In addition, since the energy measurement system also performs molding processing for all data that is discarded as a result of pile-up removal and data for unnecessary components, processing time is wasted, and this is the number of data that is truly necessary. This has led to a decline in the rate. The present invention has been made to solve the above problems, and an object thereof is to provide a radiation analyzer capable of simultaneously satisfying both contradictory problems of improving energy resolution and improving counting rate. To do.

[0011]

FIG. 1 is a block diagram showing the constitution of the first and second inventions. In the figure, 10 is an event recognition system, and a shaping circuit 11 having a small time constant, a time discrimination circuit 12 for discriminating the time intervals between pulses for pile-up removal, and a shaping circuit 11
Discriminating circuit 13 for roughly discriminating energy from the wave height of the output pulse of
3 and the switching means 30 described later, and the control circuit 14 for controlling the baseline correction signal BLR. Reference numeral 20 denotes an energy measuring system, which includes a shaping circuit 21 having a large time constant and an A / D conversion circuit 22.

Further, 30 is a switching means, and this switching means 30 converts the staircase wave voltage from the preamplifier 102 into a pulse having a wave height proportional to the magnitude of the output pulse of the detector 101. Among the pulses, the piled-up pulses and those having energy other than the measurement target are removed by the switching operation by the control signal from the control circuit 14, and the remaining pulses are subjected to waveform shaping or the like and output. The output signal of the switching means 30 is the shaping circuit 2 of the energy measuring system 20.
Input to 1. Reference numeral 41 is a memory in which the output data of the A / D conversion circuit 22 is stored.

In the above structure, the time discrimination circuit 12 has the same function as the time discrimination circuit 104 in FIG.
A control signal is sent to the switching means 30 via the control circuit 14 in order to measure the time interval between two pulses input before and after and to remove the pulse when a pileup occurs. On the other hand, the energy discriminating circuit 13 discriminates the wave height of the input pulse by a high-speed A / D conversion circuit such as a plurality of single-channel analyzers or flash A / D conversion circuits to select a certain region of the spectrum for the purpose. A control signal is sent to the switching means 30 via the control circuit 14 so that only the pulse of the energy to be passed. That is, the energy discrimination circuit 13
Set the desired energy range by setting the upper and lower limits for the energy of the input pulse and making this variable,
The control circuit 14 and the switching means 30 act to discriminate the pulse to be taken into the energy measuring system 20.

In the switching means 30, the preamplifier 1
Based on the output of 02, a pulse whose energy information is given to the amplitude is produced, and only the signal judged to be necessary by the time discrimination circuit 12 or the energy discrimination circuit 13 is passed through and input to the shaping circuit 21 of the energy measurement system 20.

In the configuration of FIG. 1, the configuration in which the switching means 30 is controlled by using the energy discrimination result by the energy discrimination circuit 13 corresponds to the first invention, and switching is performed by using the time discrimination result by the time discrimination circuit 12. The configuration for controlling the means 30 corresponds to the second invention.

FIG. 2 shows the signal waveform of each part. If a pulse as shown in the figure is output from the detector 101 each time radiation (fluorescent X-ray) from the sample is detected, the shaping circuit 21 of the energy measuring system 20 deadens each pulse, that is, one event. A processing time of time t _d is required. As shown in the figure, when the average count rate becomes 1 / t _d or more, the next event occurs while one event is being processed, so that the processing times all overlap. Therefore, in the present invention, the dead time t _d
The time discriminating circuit 12 detects a pulse generated before the passage of time, and the switching means 30 through the control circuit 14 removes this pulse to prevent pile-up.

If the output signal of the preamplifier 102 is input to the switching means 30 and the processing such as differentiation is performed and the resulting pulse is as shown in the figure, "*" is added to these pulses. The pulse is the pulse that causes pile-up. In the present invention, the switching means 3
These pulses are removed by 0, and waveform shaping or the like is performed on the remaining pulses. As a result, the input pulse of the shaping circuit 21 becomes as shown in the figure. That is, the switching means 3
Of the processing pulses at 0, the pulse marked with "*" is in the same state as it was not originally present at the output of the preamplifier 102. In the energy measuring system 20, the input pulse to the shaping circuit 21 is shaped with a large time constant and is A /
D converted. In addition, in the shaping circuit 21, the baseline correction of the pulse is performed by the baseline correction signal BLR as in the conventional case.

FIG. 3 is a waveform diagram of each part when some of the processing pulses in the switching means 30 are made effective by the function of the energy discriminating circuit 13. Assuming that the processing pulses in the switching means 30 are as shown in the figure, and when it is not necessary to measure these pulses by paying attention to the energy held by the pulses marked with "*", the energy discriminating circuit 13 causes the control circuit 14 and the switching means. If these pulses are removed via 30 and the remaining pulses are subjected to waveform shaping or the like, the input pulse of the shaping circuit 21 becomes as shown in the figure. That is, as in the case of the time discrimination, the pulse marked with “*” is in the same state as when it was not originally present in the output of the preamplifier 102.

In this way, pile-up removal and
In the present invention, unnecessary pulses are removed in the preceding stage of the energy measuring system 20 when only the pulse that holds the target energy is taken in, so that the energy measuring system 20 does not perform unnecessary waveform shaping due to a large time constant.
Only truly needed pulses can be measured at high count rates.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 is a system configuration diagram when the present invention is applied to fluorescent X-ray analysis of sulfur components in petroleum. 1 is a sample (petroleum), 2 is an X-ray tube, 3 is a secondary target, 101 is the above-mentioned A detector, 4 is a linear amplifier (including the preamplifier 102) that is a main part of the present invention, 5 is a signal processing circuit, and 6 is a concentration converter that converts the output signal of the signal processing circuit 5 into the concentration of the sulfur component. is there.

By using a copper target as the X-ray tube 2 and titanium as the secondary target 3,
It is assumed that the sample 1 is excited by monochromatic light of Ti-Kα. As a result, the sulfur component in the sample is excited and SK
Fluorescent X-rays are generated by α, and the fluorescent X-rays are detected by the detector 10
1 and outputs a voltage pulse having a wave height corresponding to the energy. After performing preamplification in the linear amplifier 4, only the predetermined input pulse is selectively shaped by the time discrimination function and the energy discrimination function and output, and the signal processing circuit 5 performs A / D conversion and storage of the input data. After performing the above, the concentration converter 6 converts the sulfur concentration in the sample.

FIG. 5A shows the output signal of the preamplifier,
The height of each step of the staircase voltage is proportional to the energy of the detected fluorescent X-rays, and the number of signals within a certain time is proportional to the intensity of the fluorescent X-rays, that is, the concentration of the constituent atoms. In the conventional linear amplifier, since all the input signals are shaped as they are in the energy measuring system, the output waveform is as shown in FIG. That is, since the signals y and z overlap with the immediately preceding signals y ′ and z ′, respectively, to cause pile-up, when the pile-up removal processing is performed, the energy held by each signal y and z and y ′ and z ′ is held. The information becomes unknown. Therefore, the constituent atoms cannot be accurately detected, and thus the concentration of the constituent atoms cannot be accurately measured.

Therefore, in this embodiment, by the time discrimination function, the signal y input immediately after the signal y'is removed at the input side of the energy measuring system so that the signal y originally exists in the output signal of the preamplifier. By processing as if it did not exist, at least the signal y'is made valid. In addition, the energy discriminating function removes, for example, the signal z ′ having a large energy (wave height) at the input side of the energy measuring system and processes it so that the signal z ′ originally does not exist in the output signal of the preamplifier. . As a result, the output waveform of the linear amplifier 4 becomes as shown in FIG. As a result, the utilization rate of the input signal to the linear amplifier 4 is increased, and as a result, the measurement can be performed at a high counting rate.

FIG. 6 shows the first embodiment of the present invention, and the same components as those in FIG. 1 are designated by the same reference numerals. In this embodiment, the switching means 30A includes a sampler 31 to which the output signal of the preamplifier 102 is input, an analog delay line 32 on the output side, and a switch 33 which is controlled to open and close by a control signal from the control circuit 14. , And the shaping circuit 34 on the output side thereof, and the output of the shaping circuit 34 is input to the shaping circuit 21 of the energy measuring system 20. The time discrimination circuit 12 includes a monostable multivibrator and an AND gate, and the energy discrimination circuit 13
Is a flash A / D to distinguish the pulse height of the input pulse
It has a conversion circuit. The shaping circuit 21 of the energy measuring system 20 is composed of a Gaussian filter provided with a differentiating circuit, an integrating circuit and the like.

Here, the sampler 31 is the simplest in structure using a differentiating circuit composed of C and R as shown in FIG. 7A, and when the dead time t _d elapses from the rise of the input pulse. , Depending on the resolution, the peak value is 1
It is possible to obtain an output pulse having an exponential decay waveform that decays to / 1024 or 1/20484. In order to return this output pulse to a differential waveform with a long time constant, a pole-zero canceller circuit having the configuration shown in FIG. 7B may be used as the shaping circuit 34.

It is preferable that the differential time constant is short, but if it is too short, fluctuations in the data acquisition time in the detector 101 will occur and the energy information due to the pulse height will not be held accurately. As a method of preventing this influence, there is a well-known series switch method. FIG. 8A shows the configuration of the series switch, and FIG. 8B shows the operation waveform.
By replacing the switching means 30A of FIG. 6 with the series switch of FIG. 8A, turning off the switch S for a short time when an input signal is detected, and turning on the switch S when the integrated waveform of the input rises sufficiently. The output signal waveform has a fast rise and no fluctuation.

FIG. 9 shows the waveform of each part in this embodiment. It is assumed that the signals α, β and γ are sequentially generated at the output a of the preamplifier in FIG. First, it is assumed that the signal α is a signal that is determined to be valid (within the measurement range) as a result of the energy discrimination in the energy discrimination circuit 13. This signal α is slightly delayed by the analog delay line 32 via the sampler 31, is shaped into a differential waveform with a large time constant by the shaping circuit 34 via the switch 33 in the off state, and is input to the shaping circuit 21 of the energy measuring system 20. It In the shaping circuit 21, waveform shaping is performed with the same time constant as that of the shaping circuit 34, and the output signal is sent to an A / D conversion circuit (not shown) and stored in the memory.

The timing when the switch 33 is turned on is the timing when the delay time by the analog delay line 32 has elapsed after the signal α was input, and the timing when the switch 33 is turned on is
This is the time when the molding time by the molding circuit 21 has elapsed since the switch 33 was turned off.

The signal β of the output a of the preamplifier is a signal generated during the period when the next input can be processed by the time discrimination function of the time discrimination circuit 12 after processing the signal α in the energy measuring system 20. But the energy discrimination circuit 1
The signal is determined to be removed because the energy discriminating function of 3 has energy information different from that of the measurement target. In this case, since it is known from the discrimination result of the energy discrimination circuit 13 that the signal β is unnecessary, the switch 33 is maintained in the ON state without being turned off, and the output side of the analog delay line 32 is maintained. Ground. Therefore, the signal β is removed from the output a of the preamplifier and is not input to the energy measuring system 20.

The signal γ of the output a of the preamplifier is a signal which is determined by the energy discriminating function to be effective, that is, a signal having the energy information of the measurement object.
Since the time interval between the signal β immediately before and the signal β immediately before is short, if the signal β is not removed as described above, the signal cannot be measured together with the signal β due to pile-up.
In this embodiment, since the signal β is removed by the energy discriminating function, the signal γ is not removed but is input to the energy measuring system 20 as shown in FIG.

Here, the time discrimination function in this embodiment will be supplemented. When a signal as shown in FIG. 10A is input to the detector 101, the signal marked with a circle in FIG.
Signals marked with "x" cannot be measured by pile-up. On the other hand, in this embodiment, since the signal inputted at the preceding timing can be measured by the time discrimination function, more signals can be measured than the conventional one as shown in FIG. 7C, and the counting rate is increased. be able to.

To explain this point in more detail, the dead time of the forming circuit in the energy measuring system 20 is shown in FIG.
_Let t _d as shown in. Note that, here, for convenience, the shaped waveform is shown by a triangular wave, but the same can be applied to the case of a Gaussian waveform or the like. The time from the wave front to the peak of this shaped waveform is t _r , the time from the peak to the wave tail is t _f , the time interval between two continuously input signals is t _i , and the sampling time of the sampler 31 is shown in FIG.
Assuming that t _s is as shown in (b), in the prior art, when t _f <t _i , both of the two signals can be measured, and when t _r <t _i <t _f , it is input first. When only the obtained signal can be measured t _i <t _r , both of the two signals cannot be measured.

However, in the present embodiment, when t _f <t _i , both of the two signals can be measured, and when t _s <t _i <t _f , only the previously input signal can be measured. only in the case of a t _i <t _s, both of the two signals becomes the measurement are not allowed.

FIG. 12 shows a spectrum when both the time discrimination function and the energy discrimination function are activated in this embodiment. Since the purpose of this example is to measure the concentration of the sulfur component in petroleum, the data required in the spectrum is the peak of S-Kα, and this peak depends on the composition ratio of carbon and hydrogen in the sample. This is the peak of Ti-Kα necessary for correction. Therefore, A shown in FIG.
r-Kα, Ti-Kβ, Fe-Kα, Cu-Kα, C
u-Kβ is unnecessary data and needs to be removed by the energy discrimination function.

By the way, the detection limit (LDL) is an important index for performance evaluation, which is three times (3σ) the statistical fluctuation of the background of the spectrum of the target component.
Is expressed by the value converted into the concentration of the target component. In FIG. 17 shown as the prior art, the LDL of S-Kα
Was 15.6 [ppm], but when the other conditions were measured in the same manner as in the prior art by utilizing only the energy discriminating function in this example, the spectrum of FIG. 12 was obtained. In FIGS. 17 and 12, the areas occupied by all spectra (areas of the portion surrounded by the base line and the waveform) are considered to be equal, and therefore the X-rays of unnecessary energy are not processed by the energy measuring system 20 according to the present embodiment. As a result, the peak of the target component is large.

By the way, the setting of the energy discrimination function here is 0 to 1990 [eV] ............ invalid (not measured) 2000 to 2600 [eV] ...... effective 2610 to 3990 [eV] ...... … Invalid 4000 to 5300 [eV] ………… Valid 5310 to 10230 [eV] ………… Invalid. According to FIG. 12, the LDL of S-Kα is 10.3.
It has been improved to [ppm]. When both the energy discriminating function and the time discriminating function were utilized, a spectrum as shown in FIG. 13 was obtained. In this case, the count number was further increased, and the LDL was improved to 8.5 [ppm].

Next, FIG. 14 shows a second embodiment of the present invention. In this embodiment, the switching means 30B has an analog delay line 32, a switch 35, an output side capacitor C ₁ , a gain 1 buffer amplifier 36, an output side capacitor C ₂ and a switch 37.
The switches 35 and 37 are controlled to be opened and closed by a control signal from the control circuit 14.

FIG. 15 shows the output of the preamplifier and the shaping circuit 21.
FIG. 4 is a diagram showing the input of and the on / off timing of switches 35 and 37. Both the switches 35 and 37 are normally in the ON state, and when the event recognition system 10 determines that the input signal is valid (not a target to be removed) as a result of time discrimination or energy discrimination, the control circuit 14 The control signal from turns off the switch 35, turns it on after a lapse of a fixed time, and simultaneously turns off the switch 37.
Turn on.

As a result, a voltage (step voltage of the preamplifier output) that is substantially equal to the voltage of the capacitor C ₁ during the period when the switch 35 is on and the switch 37 is off is input to the shaping circuit 21. . For signals that do not need to be input to the shaping circuit 21 due to the time discriminating function or the energy discriminating function, the step voltage can be changed by keeping the switch 37 on.
No more input to 1. Since the input pulse to the shaping circuit 21 holds the energy information in its wave height, it is possible to count only the pulses of the necessary composition components by performing waveform shaping and measuring these pulses in the same manner as described above. It is possible to measure the concentration of sulfur components and the like at a high count rate.

Switching means 3 in each of the above embodiments
The configuration of 0 is merely an example, and the output signal of the preamplifier is converted into individual pulses holding energy information, and only the pulse selected by the time discrimination function or the energy discrimination function of the event recognition system is energized. Any configuration may be used as long as it can be input to the measurement system.

[0041]

As described above, according to the first aspect of the present invention, by controlling the switching means based on the energy discrimination result of the event recognition system, unnecessary pulses are not input to the energy measurement system in view of the purpose of measurement. The second aspect of the present invention prevents the unnecessary pulse that causes pile-up from being input to the energy measuring system by controlling the switching means based on the time discrimination result in the event recognition system. is there.

For this reason, the pulse that becomes unnecessary as a result is removed before being input to the energy measurement system, and time is wasted by performing processing such as waveform shaping on the unnecessary pulse as in the conventional case. The target pulse input during the processing time can be measured without omission. Therefore, it is possible to realize a radiation analyzer capable of performing highly accurate measurement with a high counting rate by satisfying both the requirement of increasing the dead time in the energy measuring system to improve the energy resolution and the requirement of improving the counting rate. You can

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of first and second inventions.

FIG. 2 is a waveform diagram showing the operation of FIG.

FIG. 3 is a waveform diagram showing the operation of FIG.

FIG. 4 is a configuration diagram of an entire system to which an embodiment of the present invention is applied.

FIG. 5 is a waveform chart showing the operation of the present invention.

FIG. 6 is a block diagram showing a first embodiment of the first and second inventions.

FIG. 7 is a diagram showing a main part of the embodiment of FIG.

FIG. 8 is a diagram showing a main part of the embodiment of FIG.

9 is a waveform chart showing the operation of the embodiment of FIG.

10 is a diagram illustrating a time discrimination function of the embodiment of FIG.

FIG. 11 is an explanatory diagram of a molding waveform of the embodiment of FIG.

FIG. 12 is a spectrum showing a measurement result according to the example of FIG.

FIG. 13 is a spectrum showing a measurement result according to the example of FIG.

FIG. 14 is a block diagram showing a second embodiment of the first and second inventions.

15 is a waveform chart showing the operation of the embodiment of FIG.

FIG. 16 is a block diagram showing a conventional technique.

FIG. 17 is a waveform diagram showing the operation of FIG.

[Explanation of symbols]

 1 sample 2 X-ray tube 3 secondary target 4 linear amplifier 5 signal processing circuit 6 concentration converter 10 event recognition system 11, 21, 34 molding circuit 12 time discrimination circuit 13 energy discrimination circuit 14 control circuit 20 energy measurement system 22 A / D conversion circuit 30, 30A, 30B switching means 31 sampler 32 analog delay line 33, 35, 37 switch 36 buffer 41 memory

Front page continuation (72) Inventor Kazuro Fushimi 32-2 Nakamachi, Kodaira-shi, Tokyo (72) Masahiko Kuwata 3-1-2 Musashino, Akishima-shi, Tokyo Inside Nippon Denshi Engineering Co., Ltd.

Claims (3)

[Claims] 1. A radiation system comprising: an energy measurement system that measures the energy of radiation by the pulse height of the pulse; and an event recognition system that acts on the energy measurement system to discriminate the time between the pulses and remove unnecessary pulses. In the analyzer, the event recognition system includes means for discriminating energy based on the pulse, and an unnecessary pulse is input to the energy measurement system on the input side of the energy measurement system based on the energy discrimination result in the event recognition system. A radiation analysis apparatus comprising switching means that operates so as not to input the radiation. 2. The radiation analyzer according to claim 1, wherein the means for discriminating the energy provided in the event recognition system has variable upper and lower limits for the pulse energy. 3. A radiation system comprising: an energy measurement system for measuring the energy of the radiation by the pulse height of the pulse; and an event recognition system acting on the energy measurement system to discriminate the time between the pulses and remove unnecessary pulses. In the analyzer, the input side of the energy measuring system is provided with a switching unit that operates so as not to input an unnecessary pulse into the energy measuring system based on the result of time discrimination in the event recognition system. .