Production and use of radioactive substances for medical, research or industrial purposes

Radioactive materials have been used widely since their discovery for a variety of scientific, medical and industrial uses. In some cases, either through ignorance, carelessness or accident, sites have been left contami­nated with residues of the operations. Such sites include, for instance, fac­tories where radium was used in luminescent paint (see Chapter 15) and thorium was used in thorium-coated gas mantles.

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