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| IAEA | | The International Atomic Energy Agency (a UN body concerned with radiation and nuclear safety; also has an Action Plan on radiological protection of patients - see http://rpop.iaea.org) |
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| ICNIRP | | The International Commission on Non-Ionizing Radiation Protection (a parallel organisation dealing with non-ionising radiation - ICRP deals only with ionising radiation). |
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| ICRU | | The International Commission on Radiation Units and Measurement (a sister organisation). |
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| ICRE | | The International Commission on Radiation Education (our other sister organisation, does not currently have a Web site). |
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| ILO | | The International Labour Organization (a UN body addressing safety at work). |
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| IRPA | | The International Radiation Protection Association (a professional society open to specialists in radiation protection). |
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| ISR | | The International Society of Radiology (the founders of ICRP, ICRU, and ICRE). |
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| NEA | | The Nuclear Energy Agency (an OECD body active in radiological protection). |
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| UNSCEAR | | The United Nations Scientific Committee on the Effects of Atomic Radiation (collects and summarises information on sources and effects of radiation). |
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| WHO | | The World Health Organization (a UN body, works with radiation issues). |
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