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Management of Commercially Generated Radioactive Waste - U.S. ...

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Response<br />

135<br />

RISK PERSPECTIVES<br />

Agreed, this statement has been changed in the final document.<br />

Draft p. 3.1.65<br />

Issue<br />

The total quantity <strong>of</strong> radioactivity in curies is irrelevant. The nature <strong>of</strong> the radio-<br />

nuclides and their pathways to man are significant. (113-EPA)<br />

Response<br />

The paragraph noted was poorly worded and has been deleted. The expression <strong>of</strong> quantity<br />

<strong>of</strong> radioactivity in curies without qualification is indeed irrelevant.<br />

Draft p. 3.1.66<br />

Issue<br />

Describe how the estimate <strong>of</strong> 1 x 10 -6 for the "annual fatalities estimated due to<br />

isolated waste" is determined. Specifically, explain and justify the use <strong>of</strong> the "annual<br />

transfer probability for an atom <strong>of</strong> radium to enter the body from the geosphere." (208-NRC)<br />

Response<br />

Based on the quantity <strong>of</strong> 226 Ra in cadavers and the quantity <strong>of</strong> 22 6 Ra in the bio-<br />

sphere, the ratio <strong>of</strong> 226 Ra in man versus the biosphere was derived. This ratio, 4 x<br />

1013, coupled with the quantity <strong>of</strong> radioactive material in the repository was used to<br />

calculate the dose to man. Based on the dose to the population, the health effects were<br />

calculated to be 1 x 10- 6 /yr.<br />

Draft p. 3.1.161<br />

Issue<br />

The conclusion drawn from the comparison with the ore body would be improved.if some<br />

analysis were provided. (113-EPA)<br />

Response<br />

An expanded treatment <strong>of</strong> deep geologic waste disposal and hazard from ore bodies<br />

appears in Section 3.4.1.

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