Measuring additional dose rate contributed by nuclear plants.
Monitoring systems have been constructed to measure the net additional dose rate contributed by a nuclear plant. These systems compensate for the higher dose rate due to an increase in the natural background during rainfall or from formation of an inversion layer. The systems are simple, consisting of only four instruments; a NaI detector, a dose-rate-conversion unit to convert the distribution of pulse heights to dose rate, and two single-channel analyzers. These systems, called NaITSCA systems, have three outputs: one dose rate and two counting rates. These outputs are used to judge if the dose rate increase is due to a nuclear plant and to estimate the net additional dose rate. The Fukui Prefecture Environmental Radiation Remote Monitoring Systems are equipped with these instruments. These systems provide information every 10 min. The detection limit sensitivity of the net additional dose rate is about 5 nGy h-1.
Hayakawa
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Fukui Prefecture Environmental Radiation Monitoring Center, Tsuruga-shi, Japan.
Ohnishi
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Shimada
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D004784:Environmental Monitoring / Q000295:instrumentation*; D009688:Nuclear Reactors; D011210:Power Plants; D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000295:instrumentation*