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1Title:  Occupational radiation exposure from U.S. naval nuclear plants and their support facilities Add
 Summary:  As noted in the summary, this report describes "radiation exposures to Navy and civilian personnel monitored for radiation associated with U.S. naval nuclear propulsion plants" (1). Most of the exposure comes "from inspection, maintenance, and repair inside the reactor compartment [following reactor shutdown]. The major source of this radiation is cobalt-60 deposited inside the piping systems" (5). Additionally, "the radiation exposures in this report are almost entirely from gamma radiation," given the low level of neutron radiation following shutdown (9). The report describes the high priority placed by the Naval Reactors organization on reducing exposure, noting that "shield design criteria establishing radiation levels in various parts of each nuclear-powered ship are personally approved by the Director, Naval Nuclear Propulsion" (5). It provides an in-depth summary of personnel dosimetry used in the Naval Nuclear Propulsion Program throughout its history. The move from calcium fluoride thermoluminescent dosimeters (TLDs) to lithium fluoride TLDs began in 2006 in shipyards that perform nuclear propulsion work; the transition to lithium fluoride TLDs throughout the program, including the fleet, was completed in 2010. With lithium fluoride dosimeters, it's possible, using a methodology described in the report, to estimate background radiation sources and subtract background exposure from the "program sources of radioactivity" received by shipboard personnel (8). As a result of the move to lithium fluoride TLDs, the total fleet exposure markedly decreased in 2010 (compared with 2009), as described in the summary. Finally, the report describes the radiological controls training required for naval personnel in the nuclear propulsion program and for workers in shipyards supporting nuclear construction and maintenance work. In summary, this report provides a concise and informative study of the program's approach to radiation exposure, both in the past and current practices, including information on radiation sources, dosimetry, required physical examinations, and training. 
 Source:  http://nnsa.energy.gov/sites/default/files/nnsa/02-12-multiplefiles/NT-11-2%20FINAL.pdf 
 Date:   2011 
 Subject(s):  Health physics | Naval Reactors 
 Type:  Text 
 Format:  PDF 
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