Naturally Occurring Radioactive Material NORM 1
Naturally Occurring Radioactive Material NORM 1 :
Radioactive material containing no significant amounts of radionuclides other than naturally occurring radionuclides. The exact definition of 'significant amounts' would be a regulatory decision. Material in which the activity concentrations of the naturally occurring radionuclides have been changed by a process are included in NORM. Naturally occurring radioactive material or NORM should be used in the singular unless reference is explicitly being made to various materials.
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