[Quantitative regularities and peculiarities of the development of the cerebral form of radiation sickness at fractionated irradiation].

Several peculiarities in manifestations of cerebral form of radiation sickness have been revealed at a fractionated double irradiation with equal and unequal doses per fraction and different intervals between the fractions. A reliable increase in average lifespan of rats irradiated with (100 + 100 Gy) equal doses at 10 and 60 min intervals between two fractions compared to the single radiation exposure to 200 Gy has been obtained. Lifespan of rats irradiated with a total dose greater than 200 Gy in most cases of double exposures with 10 min interval was reliably less than that for animals after a single exposure.

[Reaction of young pigs to total gamma-irradiation].

A study was made of clinical manifestations of radiation sickness of pigs exposed to gamma-radiation within a wide range of doses, LD50/30 was about 2.82 Gy after a short-term whole-body exposure: the nonuniformity coefficient was 1.2.