Graduate Thesis Or Dissertation
 

A comparison of deterministic and probabilistic radiation dose assessments at three fictitious ¹³⁷Cs contaminated sites in California, Colorado, and Florida

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/h989r732q

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  • Two methods of radiation dose assessment were evaluated for the Cs-137 in soil ⇒ leafy vegetable ⇒ human consumption exposure pathway at three fictitious contaminated sites in California, Colorado, and Florida. An annual dose equation was developed and per USEPA risk assessment guidelines, traditional, single point annual dose estimates were calculated for all three sites at the central tendency (50th percentile) and the high end (95th percentile). Probability distributions were developed for the variables from the dose equation and used in a Monte Carlo simulation to create a range of probable doses to compare to the deterministic method. The Monte Carlo simulation was performed by using the software Crystal Ball® (an add-on program to the spreadsheet program Microsoft Excel®). Each fictitious site differed in soil type, so the effect of a site specific parameter could be evaluated on the annual dose assessment from both methods. The deterministic dose at the 95th percentile was 19, 11, and 50 times greater than the probabilistic dose at the hypothetical California, Colorado, and Florida sites, respectively. The deterministic dose at the 50th percentile was 0.54, 0.74, and 0.17 times less than the probabilistic dose at the hypothetical California, Colorado, and Florida sites, respectively. The Florida site, due to soil type, had a greater annual dose than the other sites, regardless of computational method used.
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