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the flow of electrons or positrons (beta particles) that are emitted during the beta decay of radioactive isotopes.
Effect on the organism. Beta radiation leads to the development of all the signs of radiation poisoning, even to the destruction of cells, tissues, or the entire organism. The effect of beta radiation is similar to the biological effect of ionizing radiations of other types. External irradiation of an organism by beta radiation affects only the surface tissues, since the penetrating power of beta particles does not exceed several millimeters. When 45Ca, 99Sr, and other beta-radioactive isotopes enter the organism, the nature of the radiation damage depends both on their distribution in the organs and tissues and on their half-life. The relative biological effectiveness of beta radiation is close to 1.