By Patsy F. Kanter, Cynthia Hearn Dorfman, United States. Office of Educational Research and Improvement

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When data for different proton energies and all tumor types in both sexes are pooled, the dose response appears curvilinear and similar in its general form to low-LET radiation responses for tumor induction. The results suggest some radiation-induced loss of proliferative capacity.

However, the repair and expression of damage are influenced by a number of postirradiation conditions. 1 Gy (10 rad). Low-LET radiation effects are modifiable by changing the intracellular concentration of various electronaffinic compounds, especiallyoxygen. ,1984). There are few data on late effects of electron irradiation but their carcinogeniceffects have been studied in skin (see Bums and Albert, 1986). The results indicate that repair of potentially carcinogenic damage occurs in fractionation regimes and that the doseresponse curve for single exposures is curvilinear (Fig.

RADIATION ENVIRONMENT IN SPACE originatingfrom flares located in the Eastern solar hemisphere. But,the ability to p d c t SPE can be expected to improve as solar x-ray imaging cameras and similar devices are applied to this problem. 4. 1 Introduction In order to arrive at realistic estimations of the risk posed by the radiation to which astronauts will be exposed on a given mission, estimates must be made of the amount and type of radiation to which various critical body organs might be exposed in order to assess the risk of occurrence of a given radiation-induced response.

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Helping your child learn math: with activities for children aged 5 through 13 by Patsy F. Kanter, Cynthia Hearn Dorfman, United States. Office of Educational Research and Improvement


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