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Method for eliminating counting loss of dose equivalent instrument around neutron

A surrounding dose equivalent and leakage counting technology, applied in pulsed neutron radiation field or strong neutron radiation field, can solve problems such as poor calibration, inability to measure online, unintuitive sub-dose equivalent, etc., to achieve easy data processing, Missing count correction, simple structure effect

Inactive Publication Date: 2007-12-05
TSINGHUA UNIV
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  • Summary
  • Abstract
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Problems solved by technology

Due to the residual radioactivity, the dose value is not easy to calculate when it is used repeatedly, and the reaction neutron dose equivalent is not intuitive and difficult to correct
[0005] Method 2: Use LiF thermoluminescence detector, this method cannot be measured online

Method used

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  • Method for eliminating counting loss of dose equivalent instrument around neutron
  • Method for eliminating counting loss of dose equivalent instrument around neutron
  • Method for eliminating counting loss of dose equivalent instrument around neutron

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Embodiment Construction

[0043] Use a 1 Curie Americium-Beryllium neutron source neutron irradiation dose equivalent probe, connect the main amplifier after the pre-charge sensitive amplifier, input the amplified voltage pulse into the multi-channel pulse analyzer, adjust the magnification and calculus time constant, This makes the peak at 2.31 Mev energy approximately correspond to a strain of 2.3V. Measured BF 3 The energy spectrum of the neutron counting tube is shown in Figure 5. Due to the low count rate, this spectrum has no superimposed pulses. According to the formula P j = Σ i = 1 j P i 1 · P j - i + 1 2 , Calculate Figure 6 The...

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Abstract

The invention discloses an eliminating method of error in omission of dosage equivalent meter around neutron in the pulse neutron radiation field or strong neutron radiation field applying technical domain, which is characterized by the following: utilizing charge quantity output by BF3 proportional pipe to be direct ratio to energy loss of electric particle in the pipe to test over two neutrons; increasing the output pulse amplitude; connecting multiple discriminators at the back of the equivalent meter to correspond to overlapped threshold of one, two and three neutrons; transmitting the output pulse of different discriminators into microprocessor; calculating the real dosage equivalent according to the probability of the overlapped energy spectrum; correcting the omission number. The invention is easy to process data with simple structure, which can correct the omission number effectively.

Description

technical field [0001] The present invention proposes an effective solution that can eliminate the missing counts in measurement, aiming at the neutron dose equivalent meter, which is an instrument for measuring neutron radiation hazards, when measuring in pulsed neutron fields or strong neutron fields. The invention belongs to the application technical field of pulsed neutron radiation field or strong neutron radiation field. Background technique [0002] Since the 1960s, scientists began to study the neutron dose equivalent meter. By the 1980s, it was a mature technology, and many companies in many countries had mature products for sale. For example, Neutron Monitor NM2B produced by NUCLEAR ENTERPRISES LTD. in the UK. ANM type area neutron detector and WENM wide energy neutron monitor produced by Beijing High Energy Radiation Protection Technology Co., Ltd. They are both Remmeters of the Andersson-Brauns type. Its probe structure is shown in Figure 1. Figure 1 is the pr...

Claims

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Application Information

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IPC IPC(8): G01T3/00
Inventor 李荐民王伟珍
Owner TSINGHUA UNIV
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