In 2001, scientists evaluated potential radiological doses to the public and biota resulting from exposure to Hanford Site liquid effluents and airborne emissions to determine compliance with pertinent regulations and limits.
The potential dose to the maximally exposed individual in 2001 from site operations was 0.009 millirem (9 x 10-5 millisievert) per year. Special exposure scenarios not included in this dose estimate include the hunting of game animals residing on the Hanford Site, and exposure to radiation at a publicly accessible location near the site boundary with the maximum exposure rate. Doses from these scenarios were small compared to the annual DOE dose limit.
The national average dose from background sources, according to the National Council on Radiation Protection, is ~300 millirems (3 millisieverts) per year; the current DOE radiological dose limit for a member of the public is 100 millirems (1 millisievert) per year. Therefore, the maximally exposed individual potentially received 0.009% of the DOE limit and 0.003% of the national average background dose.
|A Summary of Potential Radiological Doses from 2001 Hanford Operations|
|Radiological Dose Assessments||Dose Parameters||Dose|
|Average radiological dose from natural sources and consumer products||The dose limit includes sources such as cosmic, terrestrial, internal, and radon.||300 millirems per year|
|DOE's annual radiological dose limit for a member of the public||The dose limit includes air, drinking water, food, recreation and external radiation exposure pathways.||100 millirems per year|
|Maximally exposed individual||This hypothetical person's diet, dwelling place, and other factors were chosen to maximize the combined doses from all reasonable environmental pathways of exposure to radionuclides in Hanford Site effluents and emissions. In 2001, this individual was located at Sagemoor, directly across the Columbia River from the 300 Area.||0.009 millirem per year|
|Collective dose||The collective dose is based on a population residing within 80 kilometers (50 miles) of Hanford Site operating areas.||0.4 person-rem per year|
|Maximum Hanford Site boundary dose||Boundary dose rates are not used to calculate annual doses to the general public because no one can actually reside at the boundary locations. The highest boundary location exposure rate in 2001 was measured along the 100-N Area shoreline of the Columbia River.||0.015 millirem per hour|
|Dose to people consuming drinking water at the Fast Flux Test Facility||The potential dose to Fast Flux Test Facility workers assumes a consumption of 1 liter of drinking water from onsite wells per day (0.26 gallon per day) for 240 days.||~0.02 millirem per year|
|Maximum dose to non-DOE workers on the site (per Clean Air Act standards)||Doses to members of the public employed at non-DOE facilities were outside access-controlled areas on the Hanford Site.||0.12 millirem per year|
|Individual dose from non-DOE sources||Various non-DOE industrial sources of public radiation exposure exist at or near the Hanford Site.||~0.05 millirem per year|
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Document Number: PNNL-13910-SUM
Document Date: September 2002
Posted: October 2002