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Weak signal source positioning method based on four sensors

A weak signal and source location technology, applied in weak signal identification and radiation measurement fields, it can solve the problems of weak signal of detectors and easy to be affected by environmental background.

Active Publication Date: 2019-04-19
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a weak signal source positioning method based on four sensors for the problem that in the field environment, when the radiation source is far away, the signal of the detector will be relatively weak and easily affected by the environmental background

Method used

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  • Weak signal source positioning method based on four sensors

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Experimental use 241 Am and 137 Cs gamma radioactive source simulates pollution. 241 Am and 137 The characteristic gamma rays of the Cs source are 59.5keV and 661keV, respectively. The 2πγ emission rates of the two sources are 2.56E+04 / s and 3.18E+04 / s, respectively. In the experiment, the detector uses Ф1.5'×1.5' lanthanum bromide LaBr 3 scintillator detector. 241 Am and 137 The Csγ radiation source is measured at different distances from the detector at a position of 0.5m, and the source signal characteristics in the detector signal are analyzed, and the R ref To judge whether a radioactive source is found, the judgment method is as described above.

[0069] When the detector is selected, its intrinsic detection efficiency is correspondingly fixed. There are two factors that affect source judgment: time and distance. The measurement time is divided into 3 representative intervals: second level, 10 second level and minute level. The measuring distance ranges ...

Embodiment 2

[0077] Example 2 Source localization (3 detectors)

[0078] (1) Detector count is affected by source activity, distance from source to detector, detector shape and detection efficiency. When the distance between the source and the detector is long, the radioactive source can be approximated as a point source. Under ideal conditions, the detector count is determined by formula (5),

[0079]

[0080] In the formula:

[0081] I - the counting rate of the detector per unit time;

[0082] A - gamma emission rate of the source;

[0083] S - cross-sectional area of ​​the detector;

[0084] r - the distance from the detector to the source;

[0085] n 本征 - Intrinsic detection efficiency of the detector.

[0086] There are 3 identical detectors arranged in a row, and the distance between them is d, such as Figure 8 shown.

[0087] According to the inverse relationship between the intensity I of the detector signal and the square of the distance r (point source and the dista...

Embodiment 3

[0149] Example 3 Source localization (4 detectors)

[0150] (1) When the distance between the source and the detector is relatively long, the radioactive source can be approximately considered as a point source. Under ideal conditions, the detector count is determined by formula (20),

[0151]

[0152] In formula (20):

[0153] I - the counting rate of the detector per unit time;

[0154] A - gamma emission rate of the source;

[0155] S - cross-sectional area of ​​the detector;

[0156] r - the distance from the detector to the source;

[0157] n 本征 - Intrinsic detection efficiency of the detector;

[0158] k——The custom characteristic quantity associated with the source strength and the detector.

[0159] Such as Figure 9 As mentioned above, the four detectors are arranged symmetrically, and the two opposite detectors among the four detectors form two straight lines, and the intersection point of the two straight lines is recorded as the center point, and the dis...

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Abstract

The invention discloses a weak signal source positioning method based on four sensors, belongs to the field of weak signal identification, and aims to solve the problem that when a radioactive sourceis away in a field environment, signals of a detector are weak and are easily influenced by the environment. According to the method, four detectors are symmetrically arranged, and two opposite detectors in the four detectors form two straight lines; a gamma emissivity of the radiative source is obtained based on the intensity of the radiative source detected by the four detectors. Based on the improvement of the method, weak signal identification of the artificial gamma radiative source under the environment can be effectively achieved, and the problems in the prior method are effectively solved. Meanwhile, the method provides a four-sensor-based weak signal source positioning method which can achieve accurate positioning of the source; furthermore, when a certain detector is shielded bya front detector, the remaining three detectors can still be used for positioning, and accurate positioning can be better achieved.

Description

technical field [0001] The invention relates to the field of radiation measurement, especially the field of weak signal identification, in particular to a method for locating weak signal sources based on four sensors. Background technique [0002] Natural radiation background levels vary for many reasons (e.g. altitude, shielding, self-shielding, building structure, building materials, soil type, time of day, season, solar activity, etc.) and can vary widely. Since the radioactive source in the field is far away, the signal of the detector will be relatively weak. At this time, the fluctuation of the background will seriously affect the identification of radioactive source signals. [0003] For this reason, a new method is urgently needed to solve the above problems. Contents of the invention [0004] The purpose of the present invention is to provide a method for locating weak signal sources based on four sensors for the problem that in the field environment, when the r...

Claims

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Application Information

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IPC IPC(8): G01T1/202
CPCG01T1/202
Inventor 张宏俊文继熊忠华帅茂兵
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS