title: Comparisons of LET distributions measured in low-earth orbit using tissue-equivalent proportional counters and the position-sensitive silicon-detector telescope (RRMD-III).
abstract: Determinations of the LET distribution, phi(L), of charged particles within a spacecraft in low-Earth orbit have been made. One method used a cylindrical tissue-equivalent proportional counter (TEPC), with the assumption that for each measured event, lineal energy, y, is equal to LET and thus phi(L) = phi(y). The other was based on the direct measurement of LETs for individual particles using a charged-particle telescope consisting of position-sensitive silicon detectors called RRMD-III. There were differences of up to a factor of 10 between estimates of phi(L) using the two methods on the same mission. This caused estimates of quality factor to vary by a factor of two between the two methods.
authors.affiliation: Tsukuba Space Center, National Space Development Agency of Japan, 2-1, Sengen-2 chome, Tsukuba-shi, Ibaraki-ken 305-8505, Japan. tdoke@mn.waseda.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Doke
authors.forename: T
authors.initials: T
authors.lastname: Hayashi
authors.forename: T B
authors.initials: TB
authors.lastname: Borak
mesh_terms: D003359:Cosmic Radiation; D018534:Earth, Planet; D018499:Linear Energy Transfer; D008962:Models, Theoretical; D012825:Silicon / Q000032:analysis*; D013026:Space Flight
chemical_list: D012825:Silicon