The detection and measurement of radiation
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In the day-to-day control of radiation there are, in general, three types of measurement which must be made. Measurements are required of the dose accumulated by each individual in the course of his or her work, to ensure that the maximum permissible dose is not being exceeded. The dose rate or absorbed dose rate in areas has to be measured so that radiation areas, where the dose rate exceeds 0.75 mrem/h, can be identified. It is also necessary to detect and measure any contamination of surfaces and clothing, or even contamination of the air within a laboratory. This ensures the adequate control of open source material. Instruments have been developed with each of these tasks in mind and these instruments are considered in turn in the following sections of this chapter.
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