Radiochemical dating definition chemistry
Alpha rays are nuclei of ordinary helium atoms (see alpha particlealpha particle,one of the three types of radiation resulting from natural radioactivity.
They move at the speed of light and have a very short wavelength (or high frequency); thus they are a type of electromagnetic radiation (see gamma radiationgamma radiation,high-energy photons emitted as one of the three types of radiation resulting from natural radioactivity.radioactive waste,material containing the unusable radioactive byproducts of the scientific, military, and industrial applications of nuclear energy.Since its radioactivity presents a serious health hazard (see radiation sickness), disposing of such material is a great problem......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.....
Other, less common, types of radioactivity are electron capture (capture of one of the orbiting atomic electrons by the unstable nucleus) and positron emission—both forms of beta decay and both resulting in the change of a proton to a neutron within the nucleus—an internal conversion, in which an excited nucleus transfers energy directly to one of the atom's orbiting electrons and ejects it from the atom.