23.04.2013 Views

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

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

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

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Draft p. 1.11<br />

Issue<br />

113<br />

DOSE CACCULATIONS<br />

The annual dose from naturally occurring sources is given as 100 millirem/yr. It<br />

should be pointed out that this is a lower limit estimate and not an estimate <strong>of</strong> typical<br />

exposure. (166)<br />

Response<br />

Natural background radiation was used to provide a perspective. According to NCRP-45<br />

(NCRP 1975) 100 millirem/yr would over estimate rather than under estimate the typical<br />

exposure.<br />

Draft p. 1.11<br />

Issue<br />

It is stated that 0.1 rem per year will be used as the background dose rate. Over<br />

70 years this will result in an exposure <strong>of</strong> 7.0 rem. - - One percent <strong>of</strong> this exposure is<br />

0.07 rem. The 0.1 rem the maximum individual receives as a result <strong>of</strong> transportation is<br />

greater than 1% <strong>of</strong> background exposure, not less than 1% as stated in the Statement.<br />

(208-NRC)<br />

Response<br />

0.1 rem 0.1<br />

The comment is correct. 0.1 rem x 70 = 5 = 1.4%<br />

Statements comparing 0.1 rem to 70 years background now indicate that the dose is approxi-<br />

mately 1% <strong>of</strong> background.<br />

Draft p. 1.11<br />

Issue<br />

In comparing natural and manmade doses, person-rem is the sum <strong>of</strong> doses to individuals<br />

in the population and so is a function <strong>of</strong> both individual doses and population size. The<br />

extra 260,000 person-rem in Colorado compared to Louisiana is meaningless in that population<br />

size selection was arbitrary. Why not use New York and Hawaii? (113-EPA)<br />

Response<br />

Comparisons <strong>of</strong> population doses caused by naturally occurring sources in various<br />

regions <strong>of</strong> the United States were deleted.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!