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In page Radioactive decay:

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After World War II, the increased range and quantity of radioactive substances being handled as a result of military and civil nuclear programs led to large groups of occupational workers and the public being potentially exposed to harmful levels of ionising radiation. This was considered at the first post-war ICR convened in London in 1950, when the present International Commission on Radiological Protection (ICRP) was born.[1] Since then the ICRP has developed the present international system of radiation protection, covering all aspects of radiation hazards.[citation needed]