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  • Title: Randomization of grab-sampling strategies for estimating the annual exposure of U miners to Rn daughters.
    Author: Borak TB.
    Journal: Health Phys; 1986 Apr; 50(4):465-72. PubMed ID: 3007395.
    Abstract:
    Periodic grab sampling in combination with time-of-occupancy surveys has been the accepted procedure for estimating the annual exposure of underground U miners to Rn daughters. Temporal variations in the concentration of potential alpha energy in the mine generate uncertainties in this process. A system to randomize the selection of locations for measurement is described which can reduce uncertainties and eliminate systematic biases in the data. In general, a sample frequency of 50 measurements per year is sufficient to satisfy the criteria that the annual exposure be determined in working level months to within +/- 50% of the true value with a 95% level of confidence. Suggestions for implementing this randomization scheme are presented.
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