SU795190A1 - Radiometric device - Google Patents

Description

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The invention relates to the field of nuclear instrumentation and can be used in radiometric and dosimetric equipment with autonomous power. A radiometric device is known for detecting alpha and beta active aerosols, consisting of a detecting unit, amplitude discriminator, normalizing cascade, recorder. (mid-frequency meter) and power supply unit C 1. The radiometric device has a similar design that differs from device 2 in that a switchable pulse counting device is included in front of the recorder. . A radiometric device is known comprising a detecting unit, an amplifier, a selection unit connected in series, a recorder, .3 also a constant voltage source connected to a pulse converter, which is connected to a detector unit, amplifier, a selection node and a recorder. The radiometer is built on the principle of measuring the pulse counting rate. Pulses from a scintillation counter, arising from exposure to gamma radiation, are amplified and fed to a discriminator, which discriminates against the noise pulses of the photomultiplier and the input stage of the amplifier. Pulses from the discriminator output follow to the average frequency meter (recorder), the readings of which are proportional to the average pulse frequency. The disadvantage of these radiometric devices is the additional error of radiometric devices caused by impulse interferences from the front of the transducer. The exclusion of these interferences is theoretically associated with the high requirements for shielding the pulse converter and with the optimal wiring of the device's zero bus, which leads to practically unrealizable adjustment work. The aim of the invention is to measure the measurement error caused by the pulse marks of the pulse converter and to simplify the setup of the instruments. 02 The goal is achieved in that a device comprising a detection unit, an amplifier, a selection unit connected in series, a recorder, as well as a constant voltage source connected to a pulse converter, which is connected to the detecting unit, amplifier, selection unit and the recorder, A scheme for allocating the fronts of the converter and keys is introduced. The pulse transducer is connected to the control input of the keys via the edge allocation circuit of the transducer, the information inputs of which are connected to the selection unit, and the information outputs to the input of the recorder. This achieves blocking of the recorder inputs for the duration of the converter fronts, and excluding the disturbed pulses from the fronts from the detector from the registration. In the drawing, the representation: is structured on the circuit of the described device. The device contains a source of applied voltage 1, a pulse converter 2, a circuit 3 for selecting the edges of the converter, keys i, selection node 5, amplifier 6, detection unit 7 and a recorder 8. The device operates as follows. Converter 2, powered by a constant voltage source 1 (such conditions arise either when building portable search radiometric equipment, or building equipment designed for conducting research in space) produces the necessary high voltage for the detection unit 7 and low voltage power for individual -nodes-6, 8 radiometric devices. The pulses from the detecting unit 7 after amplification and sampling are accumulated in the corresponding cascades of the recorder 8. During the time of operation of the radiometric device, the converter 2 generates pulse interferences coinciding in time with the fronts of the converter 2 (assembled for example, according to the Roer scheme). These interferences, superimposed on a sequence of pulses from the detection unit 7, distort them, which leads to an additional measurement error.

 795190

In order to eliminate these interferences, Thus, the proposed front edge fissioning converter allows one to exclude the addition of a control pulse, significant errors from the front which closes the keys k for the time of the generator and the substantially extensibility of the front of the transducer. 5 to set the complexity of the adjustment {while the pulses from the detector, about 2 times), falling from the front of the converter. Economic efficiency is automatically excluded from the register-of-retenion by reducing the supply. Obviously, the live-time regigrat on the shielding of the conversion, due to the constant Yul frequency, simplifying the wiring of the zero bus of the converter, can be easily pro-radiometer, as well as in connection with the normalized setting of the instrument.

Claims (1)

A RADIOMETRIC DEVICE comprising a detecting unit, an amplifier, a selection unit, connected in series, a recorder, and a DC voltage source connected to a pulse converter, 'which is connected to a detection unit, an amplifier, a selection unit and a recorder, characterized in that, in order to reduce measurement errors from the edges of the transducer and simplification of the device setup; a circuit for distinguishing the edges of the transducer and keys is introduced into it; moreover, the pulse transducer through the fr The converter ends are connected to the control inputs of the keys, the information inputs of which are connected to the selection unit, and the information outputs are connected to the input of the recorder.