Assuntos
Academias e Institutos , Medicina Aeroespacial , Cooperação Internacional , Animais , Canadá , Europa (Continente) , Humanos , Índia , Japão , Pesquisa , Federação Russa , Estados UnidosRESUMO
The paper describes the design and experimental conditions of rat irradiation aboard the biosatellite Cosmos-690. An essential dose gradient due to different distances between the gamma-source and irradiated rats as well as due to the presence of construction components and equipment in the beam was made up by a special dose-equilibrating filter. The spectral distribution of scattered radiation reached maximum in the region of 0.1--0.3 Mev. The average dosage in the location of the main group of animals was 800 +/- 85 rad and that in the location of an additional group was 220 +/- 25 rad.
Assuntos
Radioisótopos de Césio , Doses de Radiação , Voo Espacial , Animais , Raios gama , RatosRESUMO
Animals on the Cosmos 690 were exposed to Cs 137 gamma-radiation of 320 curies. The on board emitter was a spherical container made of tungsten alloy with a gamma source placed in the centre. A special dose filter provided a uniform +/-10% distribution of the dose field. Animal containers were equipped with thermoluminescent dosimeters. Radiation was monitored by an on-board dosimeter and displayed. The emitter was controlled by commands from the ground. On the tenth flight day the emitter was turned on and bio-objects were exposed for 24 hours. The dose received by bio-objects located in different areas of the biosatellite varied from 200 to 1000 rad. The flight experiment confirmed entirely the reliability of the radiation system.
Assuntos
Raios gama , Monitoramento de Radiação/instrumentação , Voo Espacial/instrumentação , Dosimetria Termoluminescente , Animais , Radioisótopos de Césio , Estudos de Avaliação como Assunto , Fluoretos , Abrigo para Animais , Compostos de Lítio , Imagens de Fantasmas , Doses de Radiação , Monitoramento de Radiação/métodos , Radiometria , RatosRESUMO
Preliminary results of the radiobiological experiments carried out on the biosatellite Cosmos 690 with a radiation exposure unit on board are presented. The duration of the satellite flight was 20.5 days. On the tenth day of the flight 35 rats were exposed on board the satellite to 220 or 800 rads of gamma radiation. Comparison of data obtained in test and control groups of animals has shown that under the influence of space flight factors a somewhat more severe radiation injury develops than in on-ground conditions.
