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Radiation Protection Glossary

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Medical Exposure
Medical exposures relate to planned and deliberate exposure of a patient to Ionising Radiations for medical diagnosis or treatment. E.g. the use of X-Rays by dentists, CT Scans and incorporation of Sealed or Unsealed sources in the body. There are no 'Dose Limits ' but there are usually recommended upper levels (e.g. diagnostic reference levels). The ICRP states that only necessary exposures should be made and these should be justified on the basis that the '..medical benefits of the exposure outweigh the radiation risk..' - i.e. minimum dose that would be consistent with the medical benefit.
General term for materials used in nuclear reactors to reduce the energy (speed) of Fast Neutrons to that of Thermal (slow) Neutrons . The thermal neutrons are then able to interact and Fission with U-235.