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Wide-energy-spectrum BF3 long neutron counter measurement system

A measurement system and counter technology, applied in the field of nuclear technology, can solve problems such as low detection efficiency and low sensitivity of long counters

Active Publication Date: 2020-06-09
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And because of the need to monitor the high flux rate, the sensitivity of the long counter is minimized, that is, there is a constant lower detection efficiency within a certain error in the high energy range

Method used

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  • Wide-energy-spectrum BF3 long neutron counter measurement system
  • Wide-energy-spectrum BF3 long neutron counter measurement system
  • Wide-energy-spectrum BF3 long neutron counter measurement system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1 A kind of BF of wide energy spectrum 3 long neutron counter

[0046] A Broad Spectrum BF 3 A long neutron counter, the long neutron counter is composed of an outer moderator layer 3, an absorber layer 4, an inner moderator layer 6, a counting tube 7 and an air channel 2; the outer moderator layer 3 and the absorber layer 4 They are all in the shape of a hollow barrel, the absorbing layer 4 is nested in the outer moderator layer 3, the inner moderator layer 6 is embedded in the absorbing layer 4; the counting tube 7 is in the shape of a hollow cylinder, and is arranged through the outer The central position of the moderator layer 3, the absorption layer 4 and the inner moderator layer 6; the air channel 2 is arranged around the counter tube 7 on the inner moderator layer 6; the top of the inner moderator layer 6 is conical Groove, the air channel 2 is arranged on the cone surface, the number of the air channel 2 is ≥ 1; the inner wall of the absorption lay...

Embodiment 2

[0047] Embodiment 2 A kind of BF3 long neutron counter measuring system and measuring method of wide energy spectrum

[0048] A BF3 long neutron counter measurement system with a wide energy spectrum, the measurement system includes the long neutron counter and an electronic instrument system;

[0049] The long neutron counter is connected with electronic instruments;

[0050] The long neutron counter converts the detected neutron signal into a pulse voltage signal, and transmits the voltage signal to the electronic instrument system;

[0051] In the electronic instrument system, the pulse voltage signal transmitted from the long neutron counter is amplified, threshold value screened, and the number of pulse voltages finally recorded is the number of neutrons recorded by the long neutron counter.

[0052] The measuring method of described long neutron counter measuring system, comprises the steps:

[0053] (1) The long neutron counter is connected with the electronic instrum...

Embodiment 3

[0057] The electronic measurement system of embodiment 3 long neutron counter

[0058] The long neutron counter measurement electronics system consists of a preamplifier, a linear amplifier, a high and low voltage power supply, a single-channel analyzer, and a scaler, such as figure 2 shown.

[0059] Measuring the detection efficiency of a neutron source with a long neutron counter requires knowing the BF 3 Optimum working voltage and electronic instrument performance parameters of proportional counter tube: When the working voltage is 1700V, use 210 The plateau width measured by the Po-α-Be neutron source is 400V, and the plateau slope is <1% per 100V.

[0060] BF first 3 The proportional counter tube detects the neutron signal to generate a voltage pulse signal, which is linearly amplified by the preamplifier and linear amplifier, and then connected to a multi-channel analyzer to obtain the pulse amplitude spectrum, such as image 3 As shown, the pulse amplitude distrib...

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Abstract

The invention belongs to the field of nuclear technology application and particularly relates to a wide-energy-spectrum BF3 long neutron counter, the average energy response of the long neutron counter is 3.01 cm<2>, and the average relative deviation is 6.87%. An MCNP5 program is used for controlling a simulation calculation result to be within a statistical error range of 0.78 percent; the relative detection efficiency of the long neutron counter at the position 150 cm away from a point source is simulated, the relative detection efficiency is 2.05*10<-3> to 2.62*10<-3> within the energy range of 1 KeV to 15.2 MeV, the average relative detection efficiency epsilon is 2.31*10<-3>, and the average deviation is 6.84%. The long neutron counter overcomes the problems that in the prior art, the energy lower limit of a neutron counter is high, the energy response is sharply reduced in a range of above 5 MeV, the energy response flat range is not long enough and the like, and the requirements of high-flux-rate monitoring of most accelerator neutron sources or neutron fluence rate calibration of radioactive isotope neutron sources can be met.

Description

technical field [0001] The invention belongs to the application field of nuclear technology, in particular to a BF with a wide energy spectrum 3 Long neutron counter measurement system. Background technique [0002] The neutron detection efficiency of the long neutron counter is constant with the change of neutron energy and the n and γ discrimination performance is high. It is a simple, reliable and directional neutron that can measure neutron fluence rates in multiple energy levels. Detectors, widely used as secondary standards for neutron fluence rate measurements, play an important role in neutron metrology delivery. [0003] BF 3 The proportional counter tube structure is basically the same as the G-M tube for gamma-ray measurement, BF 3 The tube is filled with BF 3 gas, thermal neutrons pass through 10 Be(n,α) 7 Li reacts to produce α and 7 The charged particles of the Li atomic nucleus cause electron ion pairs, and then amplify the gas to output an electrical s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T3/00
CPCG01T3/00Y02E30/30
Inventor 方开洪韩亚飞王强
Owner LANZHOU UNIVERSITY
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