Detection and Measurement of Nuclear Radiation (1962) / Chapter Skim
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Low-Level Counting
Low-Level Counting
Pages 111-113
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From page 111... ...
It may be found that if a conventional detector is used for counting such low-intensity samples, the sample counting rate is comparable to the background rate from cosmic rays and other environmental radiation sources. When choosing between detector systems, the criterion for optimum counting precision in a given time is the "figure of merit" Ni/N-,, where N., is the sample counting rate, and N_ is a a gjj i.
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From page 112... ...
When the specific activity is low, as in radiocarbon dating, there is no point in considering a method which will not permit introducing a large sample and counting with high efficiency. The beta-particle energy is also involved in the choice of a detector, since absorption effects in the sample and counter window are extremely acute for beta-particle energies below about 200 kev.
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