A handbook of key federal regulations and criteria for by David Reed Greenwood; G L Kingsbury; J G Cleland; United

By David Reed Greenwood; G L Kingsbury; J G Cleland; United States. Environmental Protection Agency. Office of Research and Development

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Is given by N. D. is 1 0 0 = 10. In this case the standard deviation is 10% of the number of counts (10/100 = 10%). Radiation Safety Officer's Handbook /TOO CHAPTER A3 A3-J5 Suppose we recorded 2700 counts from a sample in a time of 3 minutes, removed the sample from the counter, and recorded a background of 300 counts in another 3 minutes. The sample count rate is 2700/3 = 900 cpm and the background is 300/3 = 100 cpm. e. 900 - 100 = 800 cpm. It can be shown that if N counts are collected in time t, then the standard deviation on the count rate (N/t) is given by a = N / t 2 .

Radiation-induced ionization causes the fiber to collapse towards its original position, and the shadow registers the movement as an increase in accumulated exposure. This "self-reading� design Radiation Safety Officer's Handbook CHAPTER A3 A3-J can be read at any time by removing a protective plastic cap, pointing the charging end to a light source, and looking through the eyepiece. Some practice may be required before the scale can be properly seen, and the reading correctly interpreted. produces negative ions (electrons) and positive ions, by interaction with the gas molecules.

A3-J2 CHAPTER A3 l le l In lithium fluoride there are actually 5 different thermoluminescent "trap� levels. 5 years, and 7 and 80 years respectively. Since there is significant decay from the first 3 levels during the 3 month wearing period and the subsequent handling period before readout, these levels are not used for dosimetry. Before reading the dosimeter, these levels are "emptied� of any residual electrons by controlled heating or "annealing� in a separate oven for 1 hour at 80°C. The remaining two "deeper� (and hence longer lived) levels on which the dosimetry is based, require a temperature of 270°C for deexcitation.

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