Abstract:
Owing to their inert chemical properties, large fission yields, and abilities to easily vent into the atmosphere, detection of radioactive xenon isotopes (
131Xe
m,
133Xe
m,
133Xe and
135Xe) is one of the most effective technology of underground test monitoring. Due to the lower γ ray emission probability and energy overlapping of X ray, the detection sensitivities of
131Xe
m and
133Xe
m are lower measured by using HPGe γ spectrometer. To enhance the detection sensitivities of
131Xe
m and
133Xe
m, an X and γ ray interactive analysis method was developed. The distribution of the net peak counts in γ spectrum was deduced through Bayesian approach. The likelihood function of
131Xe
m and
133Xe
m activities was established by using the distribution of net peak counts of X and γ ray. The activities of
131Xe
m and
133Xe
m were estimated by maximum likelihood method. The detection sensitivities of
131Xe
m and
133Xe
m are enhanced comparing with analyzing their γ ray.
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