4. Conclusion
This paper presented a gamma detector we developed applied for rapid
detecting radioactive source. The performance test was carried out in
our work. The spectra collected by the detectors were low-count spectra,
which were hard to discern whether they contained source signal or not.
Therefore, a detection method based on principal component analysis
(PCA) was proposed. The PCA extracted the feature of source efficiently.
According to the detection method, the detector would not treat any
background spectrum as source contained spectrum, the accuracy had
reached 100%. Under this condition, the alarm accuracy of the test
position 35 cm away from a 25kBq Cs-137 source (generated dose rate
about 0.017μGy/h) had reached 76% within 5 seconds. The result
illustrated that the detector and the method had high detect sensitivity
and accuracy.
Acknowlegement
This work was supported by National Natural Science Foundation of China
(grant number: 11805111).
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