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

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Draft p. 2.3.3<br />

Issue<br />

44<br />

RADIOLOGICAL ISSUES<br />

According to the note at the bottom <strong>of</strong> Table 2.3.2 some 39% <strong>of</strong> the political units are<br />

assumed to have the national average annual dose. This assumption is unwarranted. (147)<br />

Response<br />

The material in the distribution <strong>of</strong> dose from natural background appearing on p. 2.3.3<br />

has been extensively revised. The refinement as dose distribution by political unit was no<br />

longer considered relevant and was removed.<br />

Draft p. 2.3.4<br />

Issue<br />

The dose estimates for radon are obsolete. Currently, dissolved radon in the body<br />

would give a dose <strong>of</strong> about 2 to 3 mrem/yr and the range <strong>of</strong> estimated dose from inhaled radon<br />

and daughters at 0.7 pCi/liter would be 130 mrem/yr to 1800 mrem/yr. See United Nations<br />

Scientific Committee on the Effects <strong>of</strong> Atomic Radiation (UNSCEAR) Report (1977) for a more<br />

complete treatment <strong>of</strong> the question, also NCRP-45 (NCRP 1975). (113-EPA)<br />

Response<br />

The Statement notes that the whole body dose from dissolved 22 2 Rn is 3 mrem/yr. EPA<br />

states that dose is 2 to 3 mrem/yr. NCRP-45 on page 110 says dose to total lung is<br />

90 mrem/yr and to segmental bronchioles is 450 mrem/yr. But Table 45 on page 109 gives<br />

90 for 218 Po- 214 Po only plus 2 from 222 Rn and 3 for 21 0 Pb- 210 o for a total <strong>of</strong> 95. (The<br />

range <strong>of</strong> 100 to 900 mrem/yr to lung would correspond to the.average 22 2 Rn concentrations in<br />

some places in the U.S.) The value <strong>of</strong> 0.7 pCi/ (700 pCi/m 3 ) was not found in either UNSCEAR<br />

report or NCRP-45. The values given in UNSCEAR, 1977, Table 30, page 80, are 160 (20-2000)<br />

for bronchial epithelial and 30 (3-300) for lung in rad/yr. If Q = 10, then these are<br />

1600 mrem/yr for bronchial epithelial and 300 mrem/yr for lung.<br />

Draft p. 2.3.5, Table 2.3.3<br />

Issue<br />

(113-EPA)<br />

Response<br />

The data in this table are obsolete, see UNSCEAR 1977 or NCRP-45 for current data.<br />

Data from NCRP-45 (NCRP 1975) were used in the final Statement.

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