Conservative evaluation of space radiation dose equivalent using the glow curve of 7LiF:Mg, Ti (TLD-700).
For conservative evaluation of dose equivalent in space, a simple method using two glow peaks in TLD-700 has been proposed. This method is superior to the method using the two-peak ratio in terms of following the 1990 ICRP recommendation. Dependence of each peak on LET was confirmed using relativistic heavy-ion beams (He, C, Ne, Ar, and Kr) at NIRS-HIMAC. TL values as gamma-ray absorbed-dose equivalent of both peak areas were additionally combined to conservatively estimate a dose equivalent over a range of LET of 0.5-440 keV microm(-1). This method was tested in an 8.8-d Shuttle-Mir mission (STS-89) at 400 km x 51.65 degrees. The dose-equivalent rates obtained at two positions in the Spacehab module were about 0.9 mSv d(-1); this result is reasonable in a conservative sense.
Yasuda
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National Institute of Radiological Sciences, Chiba-shi, Japan.
D005118:Extraterrestrial Environment; D005720:Gamma Rays; D006801:Humans; D018499:Linear Energy Transfer; D008962:Models, Theoretical; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation / Q000379:methods; D013026:Space Flight; D013696:Temperature