Radiation dosimetry

Radiation dosimetry measures and assesses energy deposited by ionizing radiation in matter, including human tissue. It uses dose quantities, instruments, and models to estimate exposure and its effects.

Absorbed dose: Energy imparted by ionizing radiation per unit mass, measured in grays. This is the physical quantity dosimetry seeks to measure or calculate.
Equivalent dose: A radiation-protection quantity that weights absorbed dose by radiation type, measured in sieverts. It accounts for differing biological effectiveness among radiation types.
Radiotherapy dosimetry: The measurement and calculation of radiation dose delivered during cancer treatment. It verifies that treatment beams deliver the prescribed dose to intended targets.
Relative biological effectiveness: The ratio of doses from two radiation types needed to produce the same specified biological effect. It describes biological comparisons that protection weighting factors approximate in simplified form.
Gray: The SI unit of absorbed dose, equal to one joule of energy deposited per kilogram. It expresses absorbed dose in the standard unit used for dosimetric measurements.
Effective dose: A radiation-protection quantity that weights organ doses by tissue sensitivity, measured in sieverts. It estimates overall detriment from nonuniform exposure across the body.
Personal dosimetry: Monitoring an individual's occupational or environmental exposure using worn or carried dosimeters. It tracks accumulated exposure for radiation workers and other monitored individuals.
Radiation hormesis: The hypothesis that low doses of radiation can produce beneficial biological effects. It challenges simple interpretations of low-dose risk, while dosimetry itself measures dose rather than benefit.
Ionization chamber: A gas-filled detector that measures electric charge produced by radiation-induced ionization. Its collected charge provides a calibrated estimate of dose in clinical beams.
Sievert: The SI unit for equivalent and effective dose, incorporating radiation or tissue weighting factors. It distinguishes protection quantities from absorbed dose expressed in grays.

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