Abstract
Haigh Mary V. and Howard Alma Radiation-induced tumorous outgrowths in young gametophytes of Osmunda regalis. Radiation Botany 13, 111-119, 1973.-When prothalli of Osmunda regalis were irradiated 21 days after spore germination, abnormal outgrowths were observed one week or more later. Some outgrowths developed into normally-growing new prothalli: others formed tumors of limited growth. The frequency of appearance of each type was dependent on radiation dose. When 300 kVp X rays were compared with 14 MeV neutrons, the RBE for tumor production was in the range 2·5–5. For spore killing in the same material the RBE was 5·2 at high doses. The OER was also essentially the same for the two endpoints, i.e. about 2·5 for tumor induction and 2·3 for cell killing. It is suggested that the radiation effect primarily responsible for tumor production is cell death and/or mitotic arrest.
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