Abstract

Human exposure to isotopes of uranium, thorium, radium, lead, polonium and some of their shorter-lived progeny in typical natural radiation background environments is reviewed. The sources and pathways of exposure considered include external irradiation of the whole body from typical levels of the primordial radionuclides in soils, and internal irradiation of various tissues following dietary or inhalation intake. Because the scientific literature in this area is replete with extensive reviews by national, e.g. NCRP and international, e.g. UNSCEAR committees, reliance is placed on their findings.

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