Weak signal source localization method based on four sensors
A source location and weak signal technology, applied in the fields of radiation measurement and weak signal identification, can solve the problems of weak signal of the detector and easy to be affected by the background of the environment, and achieve the effect of precise positioning
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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),
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[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] like 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 distan...
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