SU476527A1 - Spectrometer -fold matches - Google Patents

Description

one

This invention relates to nuclear scintimetry.

Systems of fast-slow matches are known, which consist of detection units, amplifiers, discriminators, fast coincidence circuits, slow coincidence circuits (keys) and a multichannel amplitude analyzer.

The disadvantage of the known systems of fast-slow condominiums is that the analysis of the spectrum of condominiums is carried out only in one of the channels.

The purpose of the invention is to increase the efficiency of recording gamma-spectrometer multiple combinations with its use for controlling and analyzing the spectrum of information from all n channels.

This goal is achieved because the spectrometer additionally introduces a linear summation circuit, OR logic and delay lines, and (unlike the well-known fast-slow-coincidence spectrometers), regardless of which of the detection gamma-analyzers were recorded, It will be registered with a multi-channel amlite analyzer.

As a result, the efficiency of registering coincidences increases n times.

In addition, in each channel of the spectrometer

the full absorption of the remaining (p-1) gamma quanta is tuned, which additionally increases the efficiency of registration of matches by (n-1) times,

and ultimately, the efficiency of the spectrometer, as compared with the known, is increased by (p-1) -n times.

The drawing shows the block diagram of the proposed spectrometer.

The spectrometer contains detection units 1, each of which has two outputs. The outputs of the detection units, from which pulses are taken for amplitude analysis, are connected to linear amplifiers.

2 and with the corresponding inputs of the linear summation circuit 3, with the output of one detection unit connected to the circuit 3 directly, and the outputs of the remaining (-1) detection units — via lines

delays 4. The outputs of the linear amplifiers 2 through differential discriminators 5 are connected to the inputs of logic circuits "OR 6. The outputs of the latter are connected to the n inputs of the logic circuit" OR 7, one

the output directly, and (p-1) the outputs of the "OR 6" circuits through the delay lines 4. The outputs of the detection unit 1, from which the pulses are taken for time analysis, are connected via the corresponding fast inputs

coincidence circuits 8 to logical inputs

The OR 9 schemes directly and through delay lines 4, and the outputs of the OR 7 and 9 logic circuits to the inputs of the switch 10. The outputs of the linear summation circuit 3 and the switch 10 are connected to the corresponding inputs of the multichannel pulse analyzer 11.

The gamma-ray spectrometer “-frequency works as follows.

Amplitude pulses from the outputs of the n detection units 1 through the linear amplifiers 2 are fed to the inputs (p-1) of the differential discriminators 5 in each channel. In the discriminators, the windows are tuned to the peaks of the total absorption (p-1) of gamma-quanta of the g-fold cascade. Amplitude pulses from the detection units are simultaneously fed through delay lines 4 and directly to the n inputs of the linear summation circuit 3, the output of which is connected to the input of the multichannel pulse analyzer 11. Delay lines 4 are introduced in order to avoid the summation of pulses from cascade gamma quanta during their passage through linear summation. The delay values are chosen so that the pulses arriving at the inputs of the linear summation circuit do not overlap in time, for example, the delay in circuit 4-1 must be slightly longer than the total pulse duration from the output of detection units, the delay in circuit 4-2 must be twice as high delay in the 4-1 circuit, etc.

The pulses from the outputs of the differential discriminators 5 are fed to the inputs of logical circuits OR 6. The output pulses from the latter and the pulses from the output of the fast coincidence circuit 8 are fed through delay lines 4 and directly to the inputs of the logical circuits OR 7 and 9, respectively. The pulses from the outputs of the logic circuit "OR 7 and 9 are fed to the corresponding inputs

key 10, which produces an impulse coinciding in time with the analyzed pulse arriving at the input of the analyzer 11 from the output of the linear summation circuit 3. The control pulses from the output of the key 10 are fed to the control input of the multichannel analyzer 11 operating in the coincidence mode.

The advantage of a gamma spectrometer is the increased registration efficiency of g-multiple coincidences.

Subject invention

An n-fold coincidence spectrometer containing detection units, a key, fast coincidence circuit, amplification blocks, discriminators, and a multichannel pulse analyzer, characterized in that, in order to increase the efficiency of the registration of coincidences, a linear summation circuit, delay lines and logic circuits are introduced. ILR1, where the output of one detection unit is connected directly to one of the three inputs of the linear-summing circuit, the outputs of the remaining (p-1) detection units are connected via delay lines to the (p-1) inputs and linear summing circuits, the output of each amplifier is connected to the inputs (p-1) of the discriminators whose outputs are connected to the inputs of the OR circuit, the outputs of the OR circuit are connected via delay lines n directly to the inputs of another OR circuit, the output of which is connected to one from the key inputs, the output of the fast coincidence circuit is connected to the n inputs of the logical OR circuit and through the delay lines, and the output of the OR circuit is connected to another key input, and the outputs of the linear summation circuit and the key are connected to the corresponding inputs of the IMHO channel multiplex analyzer.