SU409167A1 - RADIOMETRIC DEVICE - Google Patents

Description

I

The invention relates to electronic physical physics for nuclear research and can be used to register one type of radiation against the background of another.

A radiometric device is known for detecting a single radiation against the background of another, containing a detector, an amplifier, discriminators in amplitude and shape, an airfoil circuit, and a recorder.

However, this device has a large measurement error at high loads, which is caused by the superposition of pulses, corresponding to 1, ix background radiation.

The purpose of the invention is to increase the measurement accuracy by eliminating the error caused by the superposition of pulses.

The goal is achieved by introducing into the device a coincidence circuit, a delay stage, a trigger and a key, connected in an appropriate way.

The block diagram of the device irivedeya in the drawing.

Detector 1 through amplifier 2 and amplitude discriminator 3 connect with input of coincidence circuit 4; at the same time the detector output / not connected to the discriminator 5 of the pulse shape (DFI). The output of the background signals. The discriminator 5 is connected to one of the inputs of the scheme sovnadeyny 6 and through the cascade 7 delay to the other the input of the coincidence circuit 6,

The output of which via trigger 8 is connected to the control key input 9. The output of the main signals of the discriminator 5 is connected to the second input of the trigger 8 and through the key 9 is connected to another input of the fusion circuit 4, the output of which, in turn, is connected to the register 10.

The device works as follows, it follows.

The detector / converts the energy of ionizing radiation into electrical pulses, the shape of which depends on the ability of radiation, that is, on external radiation. From the output of the detector, two pulses are received with medium frequencies p., And

(P

P

- pulse frequency, corresponding to

the registered type of radiation, and Pf is the average frequency of the pulses of background radiation). These sigals are amplified by the installer 2 and are accessed by an amnlitic discriminator 3, which defines the energy registration zone. The normalized signals from the output of the discriminator are fed to one by one from the inputs of the coincidence circuit 4.

In addition, the signals from the detector output / also go to discriminator 5, where they are calibrated and sorted so that background signals arrive at one of the outputs of the discriminator 5, and pulses of the detected radiation arrive at the main output.

Background nmnuls from discriminator 5 are fed directly to one of the inputs of the matching circuit 6, and to its other input through the cascade 7 of the delay, and the delay time of the cascade 7 is chosen so that it exceeds the resolution time t of the matching circuit 6. As a result, the circuit matches 6 registers random matches of background pulses.

With random coincidence pulses from the output of the coincidence circuit 6, a separate trigger 8 is triggered and the key 9 is blocked.

From the output of the main pulses of the discriminator 5, signals are sent to the separate input of the trigger 8 and to the input of the key 9. If the trigger 5 is in a state in which the key 9 is locked by an output potential, then the pulse from the output of the DFI 5 with its falling edge reorients the trigger 8 to another state The key and the key 9 opens, but this signal does not pass through the key 9 to the coincidence circuit 4. If the key 9 was opened, the impulse with DFI confirms the state of the trigger 8 and passes through the key 9. Thus from

The average frequency of the pulses arriving at the main output of the DFI 5 and including both the signals corresponding to the radiation under study and background signals of double coincidences excludes the average frequency of the pulses of random coincidences.

The subject of the invention is a radiometric device, a detector, an amplifier, an amplitude discriminator, a pulse shape discriminator, an anti-sampling selection circuit and a recorder, characterized in that, in order to improve the measurement accuracy, a delay stage, a coincidence circuit, a trigger and a key are inserted in the device, the background output the discriminator of the pulse shape is connected to one of the inputs of the coincidence circuit and through a delay stage to another input of the coincidence circuit, the output of which through a trigger is connected to the control input of the key, in stroke main signal pulse shape discriminator is connected to the second input of the flip-flop and through the switch to the input of the second coincidence circuit.