Differences in Rbe of Gamma-Rays and Fast Neutrons in the Polyploid Wheat Series

RELATIVE BIOLOGICAL EFFICIENCY OF 14.1MeV FAST NEUTRONS AND ¹³⁷Cs GAMMA RAYS IN THE STAMEN HAIRS OF <i>TRADESCANTIA REFLEXA</i> RAFIN

“…. These values are much lower than the 10 to 50 reported for higher plants with 14.1 or 14.7 MeV fast neutrons (Matsumura 1961(Matsumura , 1964(Matsumura , 1966Matsumura and Nezu 1961;Fujii 1964aFujii , 1964bSmith 1967), or the 10 to 100 with the higher LET (linear energy transfer) 0.08 to 4.7 MeV fast neutrons (Neary et al 1963;Davies and Bateman 1963;Fujii 1964b;Smith et al 1964;Matsumura and Mabuchi 1965;Matsumura 1966;Smith 1967Smith , 1969Ahnstrom et al 1969;Underbrink et al 1970), or the 10 to 50 with other heavy particles (Matsumura et al 1963;Fujii et al 1966;Moutschen et al 1968;Ikushima unpub.). Most of the earlier high RBE values (excepting those by Neary et al 1963, Davies and Bateman 1963, Matsumura et al 1963and Underbrink et al 1970) have been obtained from irradiation of dry or dormant seeds whose water contents usually fall between only 8 to 15 percent.…”

RELATIVE BIOLOGICAL EFFICIENCY OF 14.1MeV FAST NEUTRONS AND ¹³⁷Cs GAMMA RAYS IN THE PRESOAKED SEEDS OF <i>TRITICUM BOEOTICUM</i> BOISS. AND ITS AUTOTETRAPLOID

“…1, 2 and 3). These values are obviously lower than the values of about 10 to 50 usually obtained from irradiation of dry seeds with 14.1 or 14.7 MeV fast neutrons (Matsumura 1961(Matsumura , 1964(Matsumura , 1966Matsumura and Nezu 1961;Fujii 1964aFujii , 1964bSmith 1967). The present results also differ remarkably from earlier reports of extremely high RBE values of about 10 to 100 obtained from dry seeds for 0.08 to 4.7 MeV fast neutrons (Fujii 1964b;Smith et al 1964;Matsumura and Mabuchi 1965;Matsumura 1966;Smith 1967Smith , 1969Ahnstrom et al 1969) and of about 10 to 50 for other heavy particles (Fujii et al 1966;Moutschen et al 1968 (Matsumura et al 1963, with heavy particles from 10B (n , a) 7Li reaction).…”

“…Namely, high RBE values of about 10 to 50 have been obtained for 14.1 or 14.7 MeV fast neutrons (Matsumura 1961(Matsumura , 1964(Matsumura , 1966Matsumura and Nezu 1961;Fujii 1964aFujii , 1964bSmith 1967), and similarly high RBEs or sometimes those as high as 100 have been reported for 0.08 to 4.7 MeV fast neutrons with higher LET (linear energy transfer) (Neary et al 1963;Davies and Bateman 1963;Fujii 1964b;Smith et al 1964;Matsumura and Mabuchi 1965;Matsumura 1966;Smith 1967Smith , 1969Ahnstrom et al 1969;Underbrink et al 1970). Also, the RBE values reported for other heavy particles usually fall between about 10 to 50 (Matsumura et al 1963;Fujii et al 1966;Moutschen et al 1968;Ikushima unpub.…”

RELATIVE BIOLOGICAL EFFECTIVENESS OF 14MeV NEUTRONS TO γ-RAYS FOR INDUCING MUTATIONS IN SILKWORM GONIA

“…On the other hand, 14 MeV neutrons have been known to show RBE of 10 or more for induction of recessive mutations in wheat (Matsumura 1961(Matsumura , 1964Fujii 1964a) and Arabidopsis (Fujii 1964b). These high RBE values were interpreted by Matsumura et al (1963) as an evidence for the chromosome aberrations to be the cause of the majority of radiation-induced recessive mutations in higher plants.…”