Analysis of Foods for Radioactivity * by Naomi H . Harley
نویسنده
چکیده
The analysis of foods for radioactivity should not be considered as a primary defense against human intake. The first indication should always come from information on releases or from measurements of radioactivity in the airborne or waterborne releases. Once the existence of contamination has been established then the foods can be analyzed to evaluate potential hazard to man. In contrast to most other pollutants the effects of radiation are considered to have a linear response regardless of the level, thus, there is no threshold and no absolutely safe limit. Instead it is necessary to set some lower level below which the radioactivity in foods is no longer of interest as compared with other sources of radiation or other hazards of life. The analytical significance of this is that the lower limits of detection for radioactive substances have been brought down to very low levels and the simple yes or no testing for acceptability that satisfies regulations for many other pollutants in foods cannot be used. The radionuclides of interest in the case of contaminating events are almost all present now in foods in measurable quantities. Short-lived nuclides are the exception and the transuranic elements are only present at levels that require con-
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تاریخ انتشار 1996