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25-Dec-2017 19:46

The radiation produced during radioactivity is predominantly of three types, designated as alpha, beta, and gamma rays.These types differ in velocity, in the way in which they are affected by a magnetic field, and in their ability to penetrate or pass through matter.One half-life is the time required for one half of any given quantity of the substance to decay......, which is the time required for one half of a given quantity of the substance to decay.radiation sickness,harmful effect produced on body tissues by exposure to radioactive substances.The biological action of radiation is not fully understood, but it is believed that a disturbance in cellular activity results from the chemical changes caused by ionization (see.....Alpha rays are nuclei of ordinary helium atoms (see alpha particlealpha particle,one of the three types of radiation resulting from natural radioactivity.Alpha radiation (or alpha rays) was distinguished and named by E. Rutherford in 1909, who found by measuring the charge and mass of alpha particles that they are the nuclei of ordinary..... Alpha decay reduces the atomic weight, or mass number, of a nucleus, while beta and gamma decay leave the mass number unchanged.

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Members of the series are often called actinides, although actinium (at. 89) is not always considered a member of the series......

Rutherford, who found that it consists of high-speed electrons......