RISK TO CREWMEMBERS. Death from cancer is the principal health concern associated with occupational exposure to radiation. We assume a risk coefficient of 6.3 in 100,000 per millisievert for excess cancer deaths (BEIR 1990, see note with reference). For the flights listed in table 1, a crewmember's lifetime risk of fatal cancer from occupational exposure to galactic cosmic radiation can be estimated using the data in column 6. For example, on flights between Minneapolis and New York, 5.0 millisieverts (500 millirem) is received in a representative work year.1 Therefore, for each year of flying between these two cities, a crewmember will incur a lifetime risk of 5.0 x 6.3 = 31 in 100,000. After 20 years, the lifetime risk would be 20 x 31 = 620 in 100,000, or 6 in 1000.2 Thus, if 1000 crewmembers fly between Minneapolis and New York for 20 years, the expectation is that about 6 would eventually die of cancer as a result of occupational exposure to radiation. Based on normal expectation for the U.S. adult population, about 220 of the 1000 crew embers would die of cancer from causes unrelated to occupational radiation exposure (Seidman et al. 1985). It would be impossible to determine whether a particular cancer death was caused by occupational exposure.
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