Efficiency Calibration of HPGe Gamma Spectrometry of LAN system

P-4a-264
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Gamma
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spectrometry
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Gamma spectrometry
system
5.DISCUSSION
For the energy beyond 136kev, the measured values agree well with the transmission values of total
efficiency, while at the energy of 122kev, the error ix 7.8%. The reason is complicated and many-sided, such as
the statistical counting error and inaccuracy of the standard source’s activity provided.
Precise calculation of the total efficiency of cylinder-shaped volume source, as well as fast running and
other advantages, depend heavily on the personal computer. Besides, the self-absorption factor and adding
correction factor are rather important in efficiency calibration. In environmental samples, the self-absorptions of
sample’s density within wide range are quite different, but the method we’ve introduced is really used. Users
only need to measure the standard point source and some fixed data, such as detector’s parameters and trans
mission parameter. So, this method is suitable for point source and other volume sources.
If possible, we will evaluate the method on more users' detectors, and that maybe provide better result for
our work..
REFERENCES
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2.I. Ramos-Lerate, M.Barrera, R・A・Ligero, M・Casas Ruis A mew Summing—correction method for
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・Res.A395(1997)202-206.
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6.XU Zhongji, Monte carlo method, 1985.
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