Radiation hardness test of a silicon detector and preamplifier over the design lifetime for a reactor coolant leakage monitoring system
Radiation hardness tests were conducted on a silicon detector and preamplifier to develop a reactor coolant leakage monitoring system, which detects high-energy beta particles from 16N in the primary reactor coolant of nuclear power plants. Monte Carlo simulations were used to calculate the...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
VINCA Institute of Nuclear Sciences
2024-01-01
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| Series: | Nuclear Technology and Radiation Protection |
| Subjects: | |
| Online Access: | https://doiserbia.nb.rs/img/doi/1451-3994/2024/1451-39942402089P.pdf |
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| Summary: | Radiation hardness tests were conducted on a silicon detector and
preamplifier to develop a reactor coolant leakage monitoring system, which
detects high-energy beta particles from 16N in the primary reactor coolant
of nuclear power plants. Monte Carlo simulations were used to calculate the
doses that would be absorbed on components over a 60-year design lifetime.
The components were exposed to a 60Co gamma source with an activity of 2.4
kCi for 54 hours. The absorbed doses accumulated during the test were
determined to be 0.99 kGy for the detector and 1.37 kGy for the
preamplifier. During the test, the alpha count from a check source in the
high-channel range disappeared in a high-dose-rate environment, and the
gross gamma count decreased as the accumulated dose increased. The
performance degradation of the detector and preamplifier was evaluated by
comparing the alpha signals and background noise before and after
irradiation. The energy resolution of the alpha signals in the high-channel
range exhibited slight changes, whereas the electronic noise in the
low-channel range increased by approximately 773 % for the irradiated
detector and 17 % for the irradiated pre-amp. A method employing various
low-level discriminator channels is proposed to miti-gate noise effects in
the monitoring system. |
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| ISSN: | 1451-3994 1452-8185 |