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A study of genetic effects induced in populations by radioactive products of uranium 235 nuclear division part 2 predicting genetic effectiveness of irradiation at low dose rates



A study of genetic effects induced in populations by radioactive products of uranium 235 nuclear division part 2 predicting genetic effectiveness of irradiation at low dose rates



Genetika 14(4): 622-631



Chlorella, beans, wheat and developing loach eggs were used to study the dose-response relationship (dose-function of dose rate) with 90Sr, 90Y and 147Pm as sources of .beta.-radiation. In Chlorella, point mutations were induced by 147Pm. Chromosomal aberrations were induced in bean root cells and apical meristem tissue by 90Sr-90Y irradiation. Meiotic bean and wheat cells also showed chromosomal aberration after 90Sr-90Y irradiation. These all show degree dependence at a dose of less than 1. The dose which doubles the number of induced mutations is not constant and depends on dose rate. An inverse relationship is shown between dose intensity and genetic effect per dose unit. The decrease in the yield of genetic damages in the range of dose rates analyzed may be due to repair activation induced by ionizing radiations. The role of the level of spontaneous mutagenesis in estimating the resolution of test systems is considered. Increasing the level of the spontaneous mutational process is shown to increase the size of population samples which, when analyzed reveal statistically significant differences between the effect observed and the level of spontaneous mutagenesis. Applying the experimental results to the prediction of effects of ionizing radiations on natural animal and plant populations is considered.

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