SU1660490A1 - Multipurpose radiation-monitor - Google Patents

Abstract

The invention relates to the field of nuclear physics instrumentation and can be used for remote registration and investigation of mixed fields of ionizing radiation, such as neutron and gamma radiation. The purpose of the invention is to improve the accuracy of recording various types of radiation. A device containing a detector of ionizing radiation 1, a damping resistor 2, a load resistor 3, a differential amplifier 4t amplitude discriminator 5, the first 6 and second 8 pulse frequency meters, a current converter 7 is introduced the frequency of the field-effect transistor at the input, the source of which is its control input, and the third meter 9 pulse frequency, Part of the pulse energy from the radiation with the highest ionization It is directed through the second pulse frequency meter 8 to the source of the input transistor of the current-frequency converter 7, to the output of which the third pulse frequency meter 8 is connected. As a result, the in-phase potentials from the pulsed radiation component with high specific ionization losses at the gate and source of the current-frequency converter's transistor 7 are mutually compensated and limit its drain current to a value determined by the signal from the radiation with lower specific ionization losses. Thus, only one type of radiation is recorded in each of the channels of the device, which contributes to an increase in the registration accuracy. 1 il. Ј C a o th SO

Description

The invention relates to a nuclear physical instrument making apparatus and can be used for remote registration and investigation of mixed fields of ionizing radiation, for example, neutron and gamma radiation,

The aim of the invention is to improve the accuracy of recording various types of radiation.

The drawing shows a functional diagram of a universal radiometer-dosimeter j which contains the detector 1 ionizing radiation.

damping resistor 2, load resistor 3, differential amplifier 4, amplitude discriminator 5, first meter 6 pulse frequency, converter 7 current-frequency, second meter 8 pulse frequency, third meter-9 pulse frequency, high-voltage source 10 power supply and common bus.

The detector 1 is connected by an anode through an extinguishing resistor 2 to the positive terminal of a high-voltage power source 10 and to the non-inverting input of a differential amplifier 4, the inverting input of which is connected to the current-frequency converter 7 input and to the cathode of the detector 1 connected through a common resistor 3 tire. The output of differential amplifier 4 is connected via amplitude discriminator 5 to the inputs of the first meter 6 and the second meter 8 connected by the output to the control input of the current-to-frequency converter 7 connected to the input of the third meter 9 by the output. At the input of the current-frequency converter 7 the integrating circuit is turned on and a field effect transistor, the source of which is the control input of the converter 7.

Universal radiometer dosimeter works as follows.

When neutrons enter the active substance of the detector 1, the dividing fragments produced by them ionize the working environment of the detector 1, which leads to the appearance at the inputs of the differential amplifier 4 different electric impulses that fold on the collector of its input transistor. The total pulses are amplified in the differential amplifier 4 and fed to the input of the amplitude discriminator 5. Due to the difference in specific ionization losses of different types of radiation in the working substance of the detector 1, the amplitude of the pulses due to neutron about - and J-radiation is different, and the amplitude discriminator 5 passes only neutron signals radiation, having the greatest amplitude, detected by the first meter 6. According to their number, the neutron radiation flux density is judged, the neutron pulses together with the superimposed E-radiation pulses and the radiation active bЈ ve

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The substances of detector 1 charge the input capacitor and bias the gate of the input transistor of the current-to-frequency converter 7. These same pulses from the output of the amplitude discriminator 5 are fed to the input of the second meter 8 of the pulse count rate with an inverted potential output. Since the current-frequency signal at the input of the converter 7 coincides with the signal at the inverting input of the differential amplifier 4, and at the source of the current-frequency converter 7, it is inverted again and matched in amplitude by the second meter 8, the potentials from the neutron pulses are the gate and source of the input transistor of the current-frequency converter 7 are in-phase and equal in magnitude. Therefore, they are compensated, and the frequency of the pulse sequence at the output of the current-frequency converter 7 is determined only by the potential of the gate of its input transistor, due to the combination of V and r-radiation. During the operation of the device, the activity of the working substance of the detector 1 does not substantially change, and the oV component of the input signal of the first meter 6 is excluded during calibration. As a result, the measured pulse frequency is proportional to the intensity of the γ-radiation. When using detectors of another type, for example, a gas discharge counter, a similar separation of fti- and A-radiation is possible,

The use of the invention improves the accuracy of recording various types of radiation by compensating for the influence of the emission of one tin on the readings in the recorder of radiation parameters of another type,

Claims (1)

Invention Formula A universal radiometer-dosimeter containing a high-voltage power source, a damping resistor, a load resistor, a common bus, an amplifier connected in series, an amplitude discriminator and the first pulse frequency measurement, as well as a second pulse frequency meter and a detector of ionizing radiation with different specific ionization lost five connected by an anode through a damping resistor to a high-voltage power supply and a cathode through a load resistor to a common bus, the output of the amplitude discriminator is connected to the input of the second meter, which is characterized by the fact that, in order to improve the accuracy of recording various types of radiation, a converter is inserted current frequency with an input transistor, the source of which is the control input of the current-frequency converter, and the third meter of the following frequency pulses, the second pulse frequency meter is made with an inverted potential output, and the amplifier is differential and connected with a non-inverting input to the anode of the ionizing radiation detector and an inverting input to the cathode of the ionizing radiation detector and to the input of the current-frequency converter connected to the output of the third tracking frequency meter pulses and a control input to the output of the second pulse frequency meter,