Comprehensive on-line measuring method of prompt neutron attenuation constant

A technology of attenuation constant and prompt neutron, which is applied in the field of random nuclear signal analysis and processing, and can solve the problems of difficult repeatability of measurement, high cost, and huge amount of data

Inactive Publication Date: 2011-11-09
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the fast nuclear reaction speed and the huge amount of data, it is difficult to achieve real-time online measurement
Although the NMIS (Nuclear Material Identification System) system in the United States has achieved nanosecond-level sampling and synchronization, the spectrum calculation relies on hardware, the intermediate data of the measurement cannot be saved, the measurement is difficult to repeat, and the cost is extremely expensive, and the function cannot be expanded.

Method used

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  • Comprehensive on-line measuring method of prompt neutron attenuation constant
  • Comprehensive on-line measuring method of prompt neutron attenuation constant
  • Comprehensive on-line measuring method of prompt neutron attenuation constant

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Experimental program
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Embodiment 1

[0037] Embodiment 1: the present invention comprises 235U nuclear components, a detector with a prompt neutron decay constant of 0.0375 is used as an example to illustrate that all neutron pulse signals are collected through 3 channels. The first channel is the source channel, which is used to directly collect the neutron pulse signal from the 252Cf neutron source. The second channel and the third channel are used to collect the neutron pulse signal generated by the detector body excited by the neutron source. The prompt neutron attenuation constant is calculated by using the cross-correlation function CC12 and cross-power spectral density function G12 between the first channel and the second channel, obviously, using the cross-correlation function CC13 between the first channel and the third channel and The cross power spectral density function G13 can also obtain similar results.

[0038] The first step is to collect the neutron pulse, the sampling frequency is f s = 1 GH...

Embodiment 2

[0048] Embodiment 2: During the measurement process, the collected neutron pulse signal is divided into 2×10 5 blocks, a total of 20 cycles were performed. Therefore, a total of 20 sets of data were measured by the two methods, such as Figure 7 shown. Its mean and variance are shown in Table 1. due to satisfaction | m r - m q | m r + m q ≤ 0.1 , | σ r | | m r | ≤ 0.1 and | σ ...

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Abstract

The invention discloses a comprehensive on-line measuring method of prompt neutron attenuation constant. The method mainly comprises the following stages: 1) collecting neutron pulse to obtain the time distribution of neutron pulse generated by neutron source and detecting body excited by the neutron source; 2) partitioning the collected data pack according to a given length, calculating the correlation function and power spectrum density of each block of neutron signal; 3) adopting the correlated fitting method to treat the correlation function so as to calculate the prompt neutron attenuation constant, adopting the break frequency method to treat the power spectrum density so as to calculate the prompt neutron attenuation constant; and 4) performing a comprehensive treatment to the results of the two different methods to obtain the final measuring result. The method can be used to estimate the prompt neutron attenuation constant both in time domain and frequency domain and perform measurement at the same time, thus as the operating precision of measurement increases gradually, the aim of on-line measurement is finally realized.

Description

technical field [0001] The invention belongs to the field of random nuclear signal analysis and processing, in particular to a neutron pulse signal sequence, and specifically relates to a method for synthesizing and online measuring the prompt neutron decay constant of a nuclear component by using the neutron pulse signal sequence. Background technique [0002] With the rapid development of nuclear science and technology, the measurement and analysis of the information carried by the nuclear information system composed of nuclear radiation and atomic nuclei is an important guarantee for the study of the internal characteristics and laws of the nuclear information system. Prompt neutron decay constant α is an important parameter closely related to the reactivity, criticality, amount and shape of fissile materials in nuclear systems. key indicators. [0003] Generally speaking, the measurement of the prompt neutron attenuation constant α can be divided into time-domain measur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T3/00
Inventor 冯鹏魏彪金晶米德伶任勇杜科
Owner CHONGQING UNIV
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