SU1428009A1 - Dosimeter warning of dose threshold excess - Google Patents

Abstract

The invention relates to the field of measuring ionizing radiation, namely, devices for individual dosimetry monitoring. The purpose of the invention is to increase the number of alarm thresholds without increasing the overall dimensions and weight of the dosimeter. Two devices, OR 3 and 4, switch 5, threshold threshold 6, key 9, photosensitive receiver 11, D-trigger 12, are entered into the device containing detector 1, detective frequency 2, alarm control unit 7, alarm 8 and dose counter 10. optoelectronic transmitter 13 and two formers 14 and 15, which allows to increase the number of alarm thresholds by dividing the signals arriving at the dosimeter from the external unit by counting. Vani testimony. The separation in duration of the signals is due to the connection of the output of the photosensitive receiver 11 with the information in the soda switch 5 and D-flip-flop 12 and through the shaper 14 and D-flip-flop 12-with the input of the switch 5. The recalculation module counters thresholds 6 determines the number of alarm thresholds which can be from several units to several, tens of thousands of hours 1 l. with:

Description

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I Invention of OT iocj; Tcn to the region of imeregish ionizing radiation. fl precisely, to devices for individual monitoring.

The purpose of the invention is to increase the number of thresholds of the counts without increasing the overall size of the dosimeter,

  The drawing shows a functional diagram of the dosimeter, the dosimeter, the content-detector 1 and frequency divider 2, the elements OR 3 and 4, the transmitter 5, the counter thresholds 6, the alarm control unit 7,. Signals 8, Key 9, Counter 10, Photosensitive Receiver l, D-Trigger 12, 13-Onto Electronic Transmitter Shapes 14 and 1§. The detector t is connected via a frequency divider 2 to one input of elements SH1I 3 and 4, the inputs of which are connected respectively to the first and second outputs of switch 5. The output of element SHIII 3 is connected via a threshold counter 6 to the serially connected alarm control unit 7 and the signaling device 8 and to the first control input of the key 9, the output of the IL 4 element through the dose counter 10 - to the second control input of the switch 9,. The photosensitive receiver 11 is connected to the output. With informational input-1A switch 5 and key 9 to the informative input of the D-trigger 12, and through the forwarder 14-clock with the IiyiM input of the D-trigger 12. The output D-trigger 12 is connected to the input of the switch 5 and through the driver 15. with zero inputs of the dose counter 10 and the threshold counter b ..

Dosimeter, works as follows. -,

Coming from an external readout unit shown in CH (not shown), various sequences of long and short light signals are transformed by a photosensitive receiver 11 13 electrical signals of the same duration applied to the information inputs of the switch. 5, key 9, to the input-rammer 14 n to the information input D-flip-flop a 12. The shaper 14, on the leading edge of each signal, also generates a signal arriving at the clocking 4th D-flip-flop 1.2. On the falling edge of the output signal

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ST114 D-flip-flop 12 sets the output logic level, analogous to the logic level in this

moment entered his information entry. Therefore, when a long or short signal arrives at the output of D-flip-flop 12, a logic level is established that comes from

the output of the photosensitive receiver 11 during the signal or in its absence, respectively. A sputter level corresponding to a long OR short signal from the output of the D-flip-flop .12 is fed to the control input of the switch 5, allowing passage to the second inputs of the elements OR 3 shp 4, respectively, of short or differential signals. - Element OR 3

The signals from the outputs of frequency split 2 and switch 5 to the input of the porog counter 6, and the element IL11 4 pass to the input of the dose counter 10. As a result, short signals coming from the photosensitive receiver 11 are passed to the threshold counter input 65 a: long signals - to the input of the dose counter. 10, therefore the thresholds are set up by

receipt of the dosimeter from the reading unit of short signals, the dose reading when the signals arrive.

. The alarm threshold is set before starting work with the dosimeter. For this purpose, the dosimeter from the readout unit is fed first one after the other long and short signals, and then a series of short signals, the number of which is equal to the difference of the recalculation module of the threshold counter 6 and the number of signals received from the output divider 2 equal to the set alarm threshold. When a long and then a short signal arrives, D-flip-flop 12 performs the corresponding switching of logic levels at the input of shaper 15. According to the indicated difference of logical levels, shaper 15 forms a signal that is fed to the zeroing inputs of the count threshold 6 and dose counter 10. After zeroing the .6 and 10 counters, a series of short signals is fed to the input of the threshold counter 6, which sets the alarm threshold.

The signals from the output of detector 1 are fed to the input of the frequency divider 2 of the transformer kx B sigiazsh, corresponding to the dose units in which the sirnapisal threshold is set. The signals from the output of frequency divider 2 are passed by the element OR 3 to the input of the threshold counter 6 and the element OR A to the input of the dose counter 10. The counters 6 and 10 count the signals in parallel. When the output of frequency divider 2 arrives at the number of signals corresponding to the set alarm threshold, the threshold counter 6 overflows and sends a signal to the input of the alarm control unit 7 that controls the operation of the warning lamp 8. The warning light 8 starts to give audible or light signaling that the alarm threshold has been exceeded.

When reading from the reading unit to the photosensitive, the receiver 11 receives a series of long signals. the number of which is equal to the recalculation module of the dose counter, 10; These signals arrive simultaneously at the inputs of the key 9 and the dose counter 10; Until the counter of the dose counter 10 overflows, a logic level is supplied from its output to the first control input of the key 9 that prevents the key 9 from transmitting signals to the input of the optoelectronic transmitter 13, After the dose counter 10 inputs the number of signals, the p-avn difference of its conversion module and the number of signals received from frequency divider 2 when measuring the dose, the indicated counter to overflow, and from its output to the first control

Key input 9 is supplied with a logic level allowing transmission of the remaining signals to the input of the optoelectronic transmitter: 13, the rest of the series, the number of which is equal to the number of signals received from the output of frequency divider 2 and the input of dose counter 10 when measured. the doses are fed to the input of the optoelectronic transmitter 13 and are transmitted to the readout unit. In re-, As a result, the measured dose value is transmitted from the dosimeter to the reading device.

This device allows you to use different algo-

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rhythms of testing its operation prg-setting the alarm threshold and readings. If the alarm threshold is correctly measured, a dose of 10 can be performed by sending a series of long signals from a readout unit, the number of which is equal to twice the counting unit’s 10th unit recalculation rate. At the same time, a number of signals equal to the recalculation unit should go from the dosimeter to the readout unit dose counter 10. To verify that the threshold of the alarm output of the threshold threshold 6 is set correctly, it is connected to the second control input of switch 9, When the counter is overflowed and the thresholds 6 from its output, as well as for the dose counter 10, receive a logic level allowing the key 9 to transmit signals to the input of the optical transmitter 13. Therefore, checking the correctness of the threshold setting can be done the same as for the dose counter 10 by sending short signals to the dosimeter. / To test the performance of the dosimeter and the reliability of the transmitted data, before reading the readings, it is sufficient to send a set of short signals to the dosimeter from the output of the indication reading unit, the number of which is equal to twice the counting module of the threshold counter 6. A series of short signals should arrive at the reading unit, the number of which is equal to the recalculation module of the threshold counter 6 independent of the measured dose.

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Review of the dosimeter operation. was carried out for an algorithm in which the signaling threshold was set by means of feeding from the unit to read the readings of short signals, and the readings were made by means of feeding a series. long signals, which is determined by the performance of the switch 5. With the proper execution of the switch 5, the alarm threshold can be set by sending a series of long signals to the dosimeter,

Claims (1)

: F about rn-u. l and s about b. Dosimeter with the alarm threshold is exceeded dose comprising serially connected detector and the 'frequency divider, series-connected control unit and alarm indicator and counter .Also dose ¹ characterized in that in order to increase the number of alarm thresholds without increasing the overall dimensions and mass of the dosimeter, a switch, a threshold counter, a key, a G. optoelectronic transmitter, a photosensitive receiver, two forms I ι are introduced into it 1428009 '6' rover, D-flip-flop and two OR elements * connected by one input to the output of the frequency divider and other inputs respectively to the first and second outputs of the switch, the output of the first OR element is connected via the threshold counter to the input of the alarm control unit and to one control the key input, the output of the second element OR is connected through the dose counter to the second control input. of the key connected by the output to the input of the optoelectronic transmitter and information input ^x to the output of the photosensitive receiver, to the info switch input to the information input of the D-flip-flop and to. the input of the first driver, the output of which is connected to the timing input. the house of the D-trigger, connected by the output to the control input of the switch and through the second driver · to the zeroing inputs of the dose counter and threshold counter,.