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[[Accelerated fractionation]]The ICRP Glossary collects ICRP’s definitive explanations of terms for current use. Some entries include historical descriptions to help readers better understand the term in a particular context.
[[Acceptance test]]It is a living document, updated regularly.
[[Access Control]]Many ICRP publications feature their own glossaries including, for example, highly specialized terms relevant to that specific publication or helpful for a reader to have close at hand, or when introducing new terms to be added to the ICRP Glossary.
[[Active (red) bone marrow]]<div style="column-count:2;-moz-column-count:2;-webkit-column-count:2">
[[Activity median thermodynamic diameter (AMTD)]]=== <big><span id="09">0-9</span></big> ===
[[Acute Exposure]]=== <big><span id="A">A</span></big> ===
[[Clearance level]]=== <big><span id="B">B</span></big> ===
[[Decommissioning]]=== <big><span id="C">C</span></big> ===
[[Excretion function]]=== <big><span id="D">D</span></big> ===
[[Investigation level]]=== <big><span id="E">E</span></big> ===
[[Oversight]]=== <big><span id="F">F</span></big> ===
[[Principle of justification]]=== <big><span id="G">G</span></big> ===
[[Radiation Source]]=== <big><span id="H">H</span></big> ===
no edit summary
__NOTOC__[[Absorption TypeFile:Glossary Header-left2.png|800px|frameless|none|link=ICRP Glossary]]
Although the ICRP Glossary is not a dictionary, terms already well covered in the Oxford English Dictionary are not included here unless further explanation is needed to understand the way in which these terms are used in [[AccountabilityICRP publications]].
----{| class="wikitable"|-| [[Action Level#09|0-9]]|| [[#A|A]] || [[#B|B]] || [[#C|C]]|| [[#D|D]] || [[#E|E]] || [[#F|F]] || [[#G|G]] || [[#H|H]] || [[#I|I]] || [[#J|J]] || [[#K|K]] || [[#L|L]] || [[#M|M]] ||[[#N|N]] || [[#O|O]] || [[#P|P]] || [[#Q|Q]] || [[#R|R]] || [[#S|S]] || [[#T|T]] || [[#U|U]] || [[#V|V]] || [[#W|W]] || [[#X|X]] || [[#Y|Y]] || [[#Z|Z]] || [[#ZZ|...]]|}
*4DCT (see [[Activity, ATime-resolved computed tomography]])
*[[AdventitiousAbsolute risk]]
*[[Adventitious SourceAbsorbed dose]], D
*[[Aerodynamic diameter (dae)Absorbed fraction]]
*[[Air samplingAbsorption]]
*[[Air-kerma rate constantAccelerated fractionation]]
*[[Air-kerma rate constant (Γδ)Acceptance test]]
*[[Air-kerma, entrance surfaceAccess control]]
*[[Air-kerma, incident (Ki)Accountability]]
*[[Air-kerma, product (PKA)Accreditation]]
*[[Alimentary tractAction Level]]
*[[Alimentary tract transfer factor, fAActivation]]
*[[Alpha decayActive detection system]]
*[[Alveolar-interstitial region, AIActive (red) bone marrow]]
*[[AngiogenesisActivity]]
*[[Annihilation photonsActivity median thermodynamic diameter]]
*[[Annual doseAcute exposure]]
*Acute radiation sickness (see [[Area monitoringAcute radiation syndrome]])
*[[Auger transitionAcute radiation syndrome]]
*[[Authorised DischargeAdditional dose]]
*[[AuthorizationAdaptive response]]
*[[Authorized limitAdditive risk projection model]]
*[[Autoimmune diseaseAdenoma]]
*[[AutonomyAdventitious]]
*[[AvalancheAdventitious source]]
*[[Averted doseAerodynamic diameter ]]
*[[Background dose (Air-kerma rate)constant]]
*[[Backscatter Factor (B)Air kerma at the patient entrance reference point]]
*[[Basal cellAir-kerma, entrance surface]]
*[[BeneficenceAir-kerma, incident]]
*[[BenthicAir-kerma, product]]
*[[Best Available Techniques (BAT)ALARA]]
*ALI (see [[Beta-minus decayAnnual limit on intake]])
*[[Beta-plus decayAlimentary tract]]
*[[BioassayAlimentary tract transfer factor]]
*[[Bioassay functionAllometry]]
*[[Biokinetic modelAlpha decay]]
*[[Biological dosimetryAlveolar-interstitial region]]
*AMAD (see [[Biomedical research volunteerActivity median aerodynamic diameter]])
*[[BioturbationAmbient dose equivalent]], H*(10)
*[[Bone marrowAML/eto]]
*[[BradycardiaAngiogenesis]]
*[[Branching fractionAnnihilation photons]]
*[[Bronchial regionAnnual dose]]
*[[Bystander effectAnnual intake]]
*[[CalibrationAnnual limit on intake]]
*[[Cardiac arrhythmiasApoptosis]]
*[[Cardiac valve diseasesArea monitoring]]
*ARS (see [[CardiomyopathyAcute radiation syndrome]])
*[[Cardioverter-defibrillatorAttributable risk]]
*[[Categories of exposureAuger transition]]
*[[Category of exposed individualAuthorised discharge]]
*[[Cell deathAuthorization]]
*[[Chromosome dosimetryAuthorized limit]]
*[[Chronic exposureAutoimmune disease]]
*[[Class SR-0 gasesAutomatic exposure control]]
*[[Class SR-1 gasesAutonomy]]
*[[Class SR-2 gasesAverted dose]]
*[[Clonogenic cellsBackground dose (rate)]]
*[[Clonogenic survivalBackscatter detection system]]
*[[Co-expertiseBackscatter factor]]
*[[ColonyBasal cell]]
*[[Committed effective dose, E(τ)Baseline disease rates]]
*BAT (see [[CommodityBest available techniques]])
*Bcr/abl (see [[Complex tissuesBreakpoint cluster region/abelson]])
*[[Computed tomography dose index, CTDIBeneficence]]
*[[Conditional renewing (complex or flexible) tissuesBenthic]]
*[[Confidence limitsBest available techniques]]
*[[ConfinementBeta-minus decay]]
*[[Connective tissueBeta-plus decay]]
*[[Consequential late effectsBioassay]]
*[[Constancy testBiological half-life]]
*[[Consumer productBiomarker]]
*[[ContaminationBiomedical research volunteer]]
*[[Control measuresBioturbation]]
*[[Coronary heart disease/congestive heart diseaseBone marrow]]
*[[Cortical (bone) marrowBradycardia]]
*[[Cost-benefit analysisBrachytherapy]]
*[[Coster-Kronig (CK) transitionBranching fraction]]
*[[Critical groupBragg peak]]
*[[Curie, CiBreakpoint cluster region/abelson]]
*[[CytokinesBroad beam therapy irradiation technique]]
*[[D0Bronchial region]]
*[[Decay constantBronchiolar region]]
*[[Decision thresholdBystander effect]]
*CACA (see [[DecontaminationCobblestone area forming cell assay]])
*CAFC (see [[Decontamination factorCobblestone area forming cell assay]])
*CBCT (see [[Defence-in-depthCone beam computed tomography]])
*[[Deontological EthicsCardiac arrhythmias]]
*[[Deposition classCardiac valve diseases]]
*[[Derived consideration reference levelCardiomyopathy]]
*[[DiastasisCardioverter-defibrillator]]
*[[DichotomousCarers and comforters]]
*[[DifferentiationCase–control study]]
*[[DignityCell death]]
*[[Direct bioassayCharged-particle equilibrium]]
*[[DisposalChronic exposure]]
*[[Disposal FacilityClass SR-0 gases]]
*[[DNA damage signallingClass SR-1 gases]]
*[[Dose assessment/estimationClass SR-2 gases]]
*[[Dose constraintClearance]]
*[[Dose criteriaClearance level]]
*[[Dose equivalent in an organ or tissue, HT,QClinical audit]]
*[[Dose limitClonogenic cells]]
*[[Dose Modifying Factor (DMF)Clonogenic survival]]
*[[Dose per unit intake, DPUIClonogenic surviving fraction]]
*Cobblestone area cell assay (see [[Dose rateCobblestone area forming cell assay]])
*[[Dose rate effectiveness factor, DREFCobblestone area forming cell assay]]
*[[Dosemeter/dosimeterCollective dose]]
*[[DoseCo-rate effectexpertise]]
*[[Dose–response function (DRF)Cohort study]]
*[[Dose-thresholdCollective dose]]
*[[DosimetristsCollective effective dose]]
*[[DysrhythmiaCollimation]]
*[[Early effectColony]]
*[[Early normal tissue responsesCommissioning]]
*[[Effect Dose 50 (ED50)Committed effective dose]]
*[[Effective charge number, Z*Committed equivalent dose]]
*[[Effective dose equivalent, HECompartment]]
*[[Effective half-life Compartment (Teffenvironmental)]]
*[[Electron-capture decayComplex tissues]]
*[[ElectrophysiologyComputed tomography dose index]]
*[[EmergencyConcentration ratio]]
*[[Emergency exposure situationCone beam computed tomography]]
*[[Emergency planConnective tissue]]
*[[Emergency preparednessConsequential late effects]]
*[[Emergency proceduresConstancy test]]
*[[Emergency WorkerContainment]]
*[[Endogeneous excretionContamination]]
*[[Entrance surface doseCoronary heart disease]]
*[[Environmental (Cosmic radiation) monitoring]]
*[[Environmental exposureCost-benefit analysis]]
*[[Environmental radiation protectionCoster-Kronig transition]]
*CR (see [[EpitheliumConcentration ratio]])
*[[EquityCross section]]
*Cumulative air kerma (see [[Equivalent dose (HT)Air kerma at the patient entrance reference point]])
*[[ErythropoietinCumulative dose]]
*[[EthicsCurie]]
*[[Event tree analysisCytokines]]
*DAC (see [[Excretion rateDerived air concentration]])
*DBT (see [[Exempt wasteDigital breast tomosynthesis]])
*DCRL (see [[Exemption Derived consideration reference level]])
*DD (see [[Existing exposure situationDoubling dose]])
*DDI, detector dose indicator (see [[Exponential survival curveExposure index]])
*DIL (see [[ExposureDerived investigation level]])
*DDREF (see [[Exposure assessmentDose and dose-rate effectiveness factor]])
*[[Exposure PathwayDecay constant]]
*[[Exposure situationDecommissioning]]
*[[External radiationDecontamination]]
*[[Extrapolation numberDecontamination factor]]
*[[Extrathoracic airwaysDental and maxillofacial imaging]]
*[[Extremity dosemeterDeontological Ethics]]
*[[FairnessDeposition]](inhalation)
*[[Fault tree analysisDerived air concentration]]
*[[Field-size effectDerived consideration reference level]]
*[[Fixed (surface) contaminationDerived investigation level]]
*[[Flexible tissuesDerived limit]]
*[[Fluoroscopically guided interventionsDerived reference level]]
*[[ForbiddennessDesignated area]]
*Detector dose indicator (see [[FractionationExposure index]])
*[[Fractionation sensitivityDetector quantum efficiency]]
*[[Galactic cosmic radiation (GCR)Deterministic effect]]
*[[Gamma rayDetriment]]
*[[GastrointestinalDetriment-adjusted risk]]
*[[Gastrointestinal syndromeDiagnostic reference level]]
*[[Geochemical phase associationDiastasis]]
*[[Graded approachDicentric chromosome]]
*[[Granulocyte colony-stimulating factorDichotomous]]
*[[Granulocyte-macrophage colony-stimulating factorDifferentiation]]
*[[Growth fractionDigital breast tomosynthesis]]
*[[Growth hormone (somatotropin)Dignity]]
*[[Habitual mouth breatherDirect bioassay]]
*[[Habitual nose breatherDirectional dose equivalent]]H’(d,Ω)
*[[Half-life, physical (T1/2)Disposal]]
*[[HazardDisposal facility]]
*[[Health SurveillanceDistribution coefficient]](''K<sub>d</sub>'')
*DLP (see [[HeliosphereDose-length product]])
*[[Hierarchical tissuesDNA damage signalling]]
*[[High level waste, HLWDose]](of ionising radiation)
*[[HormonesDose and dose-rate effectiveness factor]]
*[[Human Respiratory Tract Model (HRTM)Dose coefficient]]
*[[Hyperbaric oxygenDose commitment]]
*[[Hypertrophic cardiomyopathyDose constraint]]
*[[HypoplasiaDose conversion coefficient]]
*[[Immune systemDose conversion convention]]
*[[In vivo measurementDose conversion factor]]
*[[Inactive (bone) marrowDose criteria]]
*[[IncidentDose equivalent]]in an organ or tissue
*[[InclusivenessDose limit]]
*[[Individual decontaminationDose modifying factor]]
*[[Individual doseDose of record (E)]]
*[[Individual dose equivalentDose of record Hp (10)]]
*[[Individual dose restrictionDose per content function]]
*[[Individual monitoringDose per unit intake coefficient]]
*[[Individual-relatedDose rate]]
*[[Individual-relatedDose rate effectiveness factor]]
*[[IndividualDose-related assessmentlength product]]
*[[Informed ConsentDose-threshold hypothesis]]
*[[Ingestion exposure planning zone, IEPZDose-rate effect]]
*[[InhalabilityDose-response function]]
*[[Inhalation classDose-threshold]]
*[[Initial slopeDoubling dose]]
*DQE (see [[Inner bremsstrahlungDetector quantum efficiency]])
*DRL (see [[Institutional controlDiagnostic reference level]])
*[[Intermediate level waste, ILWDRL process]]
*[[Internal conversion electronDRL quantity]]
*[[Interphase deathDRL value]]
*[[Intervention LevelDS02]]
*[[Interventional procedureDS86]]
*EAR (see [[Iodine prophylaxisExcess absolute risk]])
*[[Iso-effect plotsEarly normal tissue responses]]
*[[IsolationEdema]]
*[[Isomeric transition decayEffect Dose 50 ]]
*[[IsomersEffect modifier]]
*[[Isotropic geometryEffective charge number]]
*[[IteroparousEffective dose]], E
*[[Itinerant (radiation) workerEffective dose equivalent]]
*[[JusticeEffective half-life]]
*EI (see [[JustificationExposure index]])
*[[K, Kp indexElectron-capture decay]]
*[[Kerma-area product (KAP)Electrophysiology]]
*[[Late effect, delayed effectElemental dose]]
*ELR (i.e. Excess Lifetime Risk, see [[Latent time/period or latency intervalLifetime risk estimates]])
*[[Legal personEmergency]]
*[[LegislatorsEmergency exposure situation]]
*[[LimitEmergency plan]]
*[[Limitation of doseEmergency preparedness]]
*[[Lineal energyEmergency procedures]]
*[[Linear no-threshold (LNT) hypothesisEmployer]]
*[[Linear-non-threshold (LNT) modelEndogeneous excretion]]
*Endosteal tissue (see [[Low Earth orbit (LEO)Endosteum]])
*[[Low level waste, LLWEndosteum]]
*[[Low toxicity alpha emitterEnvironmental exposure]]
*[[Lung absorption typeEnvironmental radiation protection]]
*[[Lymphatic systemEpigenetic effects]]
*[[Macrophage colony stimulating factorEpithelium]]
*[[MagnetosphereEquieffective dose]]
*[[Medical exposure]] [[Medical interventionEquilibrium equivalent concentration]]
*[[Member of the publicEquilibrium factor]]
*[[Mendelian diseasesEquity]]
*[[Minimum significant activity (MSA)Equivalent dose]]
*ERR (see [[MitigationExcess relative risk]])
*[[MonitoringErythropoietin]]
*[[Multistage tumorigenesisEthics]]
*[[Myocardial perfusionEvacuation]]
*[[Nasal AugmenterExcess absolute risk]]
*Excess lifetime risk (see [[Natural backgroundLifetime risk estimates]])
*[[Natural environmentExcess relative risk]]
*[[Naturally occurring radioactive material Excretion rate (NORMinstantaneous)]]
*[[NecrosisExclusion]]
*[[Neurological syndromeExempt waste]]
*[[Neurovascular syndromeExemption level]]
*[[Non-maleficenceExisting exposure situation]]
*[[Non-sphericity parameter (η)Exogenous excretion]]
*[[Nuclear track detectorsExpanded and aligned radiation field]]
*[[Nuclear transformationExpanded radiation field]]
*[[Occupational exposureExponential survival curve]]
*[[Occupationally exposed workerExposed individuals]]
*[[EdemaExposure, external or internal]]
*[[Operational intervention level, OILExposure (in the context of inhalation)]]
*[[Operational monitoringExposure index]]
*[[Optically stimulated luminescence (OSL) dosimetersExposure pathway]]
*[[OptimisationExposure situation]]
*[[Orphan sourceExtrathoracic airways]]
*[[Particle radiance, Φ ̇ΩFairness]]
*[[PatientField-size effect (Volume effect)]]
*[[Patient entrance reference pointFlexible tissues]]
*[[Peak skin doseFluence]], Φ
*[[PelagicFluoroscopically guided interventions]]
*[[Percutaneous coronary intervention (PCI)Fluoroscopically or computed tomography guided interventions]]
*[[PericarditisForbiddenness]]
*[[Personal air samplingFractional absorption in the gastrointestinal tract]], f<sub>1</sub>
*[[Personal/Individual MonitoringFractionation]]
*[[PharynxFractionation and dose delivery patterns]]
*[[Planned exposure situationFractionation sensitivity]]
*[[Practical radiological protection cultureFrequent flyer]]
*FSU (see [[Precautionary principleFunctional subunits]])
*[[Principle of application of dose limitsFunctional subunits]]
*[[Principle of optimisationGalactic cosmic radiation]]
*[[Procedural valuesGamma ray]]
*[[Projected doseGastrointestinal syndrome]]
*[[Protection strategyGastrulation]]
*[[Protective actionGastroschisis]]
*[[PrudenceGATA binding protein 2]]
*GATA-2 (see [[Public exposureGATA binding protein 2]])
*[[ReasonablenessGenomic integrity]]
*Geomagnetic cut-off rigidity (see [[RecoveryRigidity threshold]])
*[[Reference levelGraded approach]]
*[[RehabilitationGraft vs host disease]]
*[[Rehabilitation of living conditionsGranulocyte colony-stimulating factor]]
*[[RemediationGranulocyte-macrophage colony-stimulating factor]]
*[[Representative organism Gray]] (non-human biotaGy)]]
*[[Representative personGround-level enhancement]]
*[[Residual doseGrowth factor]]
*[[Right to knowGrowth fraction]]
*[[Self-help protectionGrowth hormone (somatotropin)]]
*[[StakeholderHabitual mouth breather]]
*[[TolerabilityHabitual nose breather]]
*[[TransparencyHalf-life, physical]]
*HATM (see [[Utilitarian ethicsHuman Alimentary Tract Model]])
*[[Value judgementHazard]]
*[[Virtue ethicsHealth Surveillance]]
*[[Heliosphere]] *[[Hereditary effect]] *[[Hierarchical tissues]] *[[High level waste]] *[[High linear energy transfer radiation]] *[[Homologous recombination]] *[[Hormones]] *[[Hounsfield unit]] *HRTM (see [[Human Respiratory Tract Model]]) *[[Human Alimentary Tract Model]] *[[Human Respiratory Tract Model]] *[[Hyperbaric oxygen]] *[[Hyperfractionation]] *[[Hypertrophic cardiomyopathy]] *[[Hypoplasia]] === <big><span id="I">I</span></big> === *[[ICRU 4-element tissue]] *[[ICRU sphere]] *[[Immune system]] *IMRT (see [[Intensity-modulated radiotherapy]]) *[[In vivo radiobioassay]] *[[Incidence]] *Incidence rate (see [[Incidence]]) *[[Incident]] *[[Inclusiveness]] *[[Individual decontamination]] *[[Individual monitoring]] *[[Individual-related]] *[[Induced genomic instability]] *[[Informed consent]] *[[Inhalability]] *[[Inner bremsstrahlung]] *[[Institutional control]] *[[Intervention]] *[[Intensity-modulated radiotherapy]] *[[Intake]] *[[Intermediate level waste]] *[[Internal conversion electron]] *[[Interphase death]] *[[Intervention Level]] *[[Interventional procedure]] *[[Investigation level]] *[[Iso-effect plots]] *[[Isomers]] *[[Isotropic geometry]] *[[Itinerant (radiation) worker]] === <big><span id="J">J</span></big> === *[[Justice]] *[[Justification]] === <big><span id="K">K</span></big> === *[[Kerma]], K *[[Kerma approximation]] *[[Kp index]] === <big><span id="L">L</span></big> === *[[Lag]] *[[Late normal tissue responses]] *[[Latent time/period or latency interval]] *[[LD 50/30|LD<sub>50/30</sub>]] *LET (see [[Linear energy transfer]]) *[[Licensee]] *[[Life Span Study]] *[[Lifetime risk]] *[[Lifetime risk estimates]] *[[Limitation of dose]] *[[Lineal energy]] *[[Linear dose response]] *[[Linear energy transfer]] *[[Linear-non-threshold model]] *[[Linear-quadratic dose response model]] *LLE (see [[Lifetime risk estimates]]) *[[Local DRL]] *Loss of Life Expectancy (see [[Lifetime risk estimates]]) *[[Low Earth orbit]] *[[Low dose]] *[[Low dose rate]] *[[Low level waste]] *[[Low linear energy transfer radiation]] *LSS (see [[Life Span Study]]) *[[Lymphatic system]] === <big><span id="M">M</span></big> === *[[Macrophage colony stimulating factor]] *[[Magnetosphere]] *[[Marrow cellularity]] *[[Mass median diameter]] *MDCT (see [[Multi-detector computed tomography]]) *[[Mean glandular dose]] *[[Measured quantity]] *[[Medical exposure]] *[[Member of the public]] *[[Mendelian diseases]] *[[Mitigation]] *MMD (see [[Mass median diameter]]) *[[Molecular imaging]] *[[Multifactorial diseases]] *[[Multiplicative risk projection model]] *[[Multistage carcinogenesis model]] *[[Multistage tumorigenesis]] *[[Multitarget equation]] *[[Multi-detector computed tomography]] *[[Mutation component]] *[[Myocardial perfusion]] *[[Myocardial stress test]] === <big><span id="N">N</span></big> === *[[National radon survey]] *[[National DRL]] *[[Naturally occurring radioactive material]] *[[Necrosis]] *[[Neurological syndrome]] *[[Neurovascular syndrome]] *NHEJ (see [[Non-homologous end joining]]) *[[Noise]] (in imaging) *[[Nominal value]] *[[Nominal risk coefficient]] *[[Non-homologous end joining]] *[[Non-maleficence]] *[[Non-sphericity parameter]] *[[Non-targeted effects]] *[[Normal tissue complication probability]] *[[Notification value]] (in CT) *[[Nuclear medicine]] *[[Nuclear track detectors]] === <big><span id="O">O</span></big> === *OAR (see [[Organ at risk]]) *[[Occupancy factor]] *[[Occupational exposure]] *OEA (see [[Oxygen enhancement ratio]]) *[[OLINDA/EXM]] *[[Oncogene]] *[[Operating management]] *[[Operational quantity]] *[[Optimisation]] *[[Optimisation of protection]] *Organ absorbed dose (see [[Organ/tissue absorbed dose]]) *[[Organ at risk]] *[[Organ dose equivalent]] *[[Organ/tissue absorbed dose]] *[[Other (systemic) tissues]] *[[Orphan source]] *[[Oversight]] *[[Oxygen enhancement ratio]] === <big><span id="P">P</span></big> === *Particle fluence (see [[Fluence]]) *[[Particle transport]] (in biokinetics) *[[Particle radiance]] *[[Patient entrance reference point]] *[[Peak skin dose]] *[[Pelagic]] *[[Pencil beam]] *[[Percutaneous coronary intervention]] *[[Pericarditis]] *[[Personal dose equivalent]], H<sub>p</sub>(d) *[[Phantom]] *[[Pharynx]] *[[Pilomatricoma]] *[[Planned exposure situation]] *[[Platelet-derived growth factor]] *PLDR (see [[Potentially lethal damage repair]]) *[[Pooled analysis]] *[[Population risk]] *[[Potential alpha energy concentration]] *[[Potential exposure]] *[[Potential recoverability correction factor]] *[[Potentially lethal damage repair]] *[[Practical radiological protection culture]] *[[Practice]] *PRCF (see [[Potential recoverability correction factor]]) *[[Prevailing circumstances]] *[[Principle of application of dose limits]] *[[Principle of justification]] *[[Principle of optimisation]] *[[Principles of protection]] *[[Procedural values]] *[[Progenitor cell]] *[[Programmed cell death]] *[[Projected dose]] *[[Protection quantities]] *[[Protection strategy]] *[[Protective action]] *[[Protective action guide]] *[[Prudence]] *[[Public exposure]] === <big><span id="Q">Q</span></big> === *[[Qualified expert]] *[[Quality control testing]] (x-ray equipment) *[[Quality factor]], Q(L) *[[Quasi-threshold dose]] === <big><span id="R">R</span></big> === *[[Radiation belt]] *Radiation detriment (see [[Detriment]]) *[[Radiation modifier]] *[[Radiation risk]] *[[Radiation safety officer]] *[[Radiation source]] *[[Radiation weighting factor]], w<sub>R</sub> *[[Radiation-induced second cancer]] *[[Radiation-induced secondary malignancy]] *[[Radiation worker]] *[[Radioactive dispersion device]] *[[Radioactive source]] *[[Radioactive substance]] *[[Radioactive waste]] *[[Radioactivity]] *[[Radiofrequency ablation]] *[[Radiographer]] *[[Radiological attack]] *[[Radiological controlled area]] *[[Radiological protection principles]] *[[Radionuclides of natural origin]] *[[Radioresponsiveness]] *[[Radiosensitiser]] *[[Radiosensitivity, cellular]] *[[Radon progeny]] *[[Radon-prone area]] *RAP (see [[Reference Animal and Plant]]) *[[Ras]] *[[Rb]] *RBE (see [[Relative biological effectiveness]]) *[[Reactive oxygen species]] *[[Reasonableness]] *[[Recovery]] *[[Recovery responder]] *[[Recovery (cellular or tissue)]] *[[Redox]] *[[Reference air kerma]] *[[Reference Animal and Plant]] *[[Reference bioassay function]] *[[Reference biokinetic model]] *[[Referrer]] *Reference female (see [[Reference Person]]) *[[Reference individual]] *[[Reference level]] *Reference male (see [[Reference Person]]) *[[Reference parameter value]] *[[Reference Person]] *[[Reference phantom]] *[[Reference value]] *[[Reference worker]] *[[Region]] *[[Regional diagnostic reference levels]] *[[Registry]] *REID (see [[Lifetime risk estimates]]) *[[Rigidity threshold]] *[[Rehabilitation of living conditions]] *[[Relative biological effectiveness]] *[[Relative life lost]] *[[Relative risk]] *[[Relative survival]] *[[Relocation]] *[[Remedial action]] *[[Remediation]] *[[Repopulation]] *[[Representative organism (non-human biota)]] *[[Representative person]] *[[Reproductive integrity]] *[[Residual dose]] *[[Respiratory protection]] *Response function (see [[Dose-response function]]) *[[Retrievability]] *[[Reversibility]] *[[Right to know]] *[[Rigidity threshold]] *[[Rigidity]] *[[Ring chromosome]] *[[Risk]] *[[Risk coefficient]] *[[Risk model]] *RISM (see [[Radiation-induced secondary malignancy]]) *Risk of exposure-induced death (see (see [[Lifetime risk estimates]]) *ROS (see [[Reactive oxygen species]]) *[[Routine monitoring]] *RR (see [[Relative risk]]) === <big><span id="S">S</span></big> === *[[S coefficient (radiation weighted)]] *SAF (see [[Specific absorbed fraction]]) *[[Safety case]] *[[Safety]] *[[Safety culture]] *[[Scintigraphy]] *[[Sealed source]] *[[Secondary radiation]] *[[Secretory cells]] *[[Security]] *[[Security screening]] *SEE (see [[Specific effective energy]]] *[[Self-help protection]] *[[Senescence]] *[[Severe deterministic injury]] *[[Sheltering]] *[[Shielding]] *[[Sievert]] (Sv) *[[Size-specific dose estimate]] *SLDR (see [[Sublethal damage repair]]) *[[Slice]] (in CT & CBCT) *[[Slow repair]] *SOBP (see [[Spread-out Bragg peak]]) *[[Solar cosmic radiation]] *[[Solar cycle]] *[[Solar flare]] *[[Solar particle event]] *[[Solar wind]] *[[Somatic effect]] *Source (see [[Radiation source]]) *[[Source region]] *[[Source term]] *[[Source-related]] *[[Source-related assessment]] *[[South Atlantic anomaly]] *[[Special (non-routine) monitoring]] *[[Specific absorbed fraction]] *[[Specific effective energy]] *[[Spongiosa]] *[[Spontaneous fission]] *[[Spread-out Bragg peak]] *[[Stakeholder]] *[[Standard-size adult]] *[[Stem cell]] *[[Stenosis]] *[[Stochastic effect]] *[[Storage]] *[[Subcutaneous tissue]] *[[Sublethal damage repair]] *[[Substantial radiation dose level]] *[[Superposition principle]] (in dosimetry) *[[Supervised area]] *[[Surface contamination]] *[[Systemic model]] === <big><span id="T">T</span></big> === *[[Tachycardia]] *[[Target region]] *[[Target tissue]] *[[Targeted effects]] *[[Telangiectasia]] *[[Teratocarcinoma]] *[[Thermodynamic diameter]] *[[Thoracic airways]] *[[Threshold dose for tissue reactions]] *[[Threshold level]] *Tissue absorbed dose (see [[Organ/tissue absorbed dose]]) *[[Thoron progeny]] *[[Thyroid blocking]] *[[Time factor]] *[[Time-resolved computed tomography]] *[[Tissue equivalent material]] *[[Tissue reaction]] *[[Tissue weighting factor]] *[[Tolerability]] *[[Tolerance dose]] (in Radiotherapy) *[[Track structure]] *[[Transfer compartment]] *[[Transfer of risk]] *[[Transfer rate]] *[[Transforming growth factor]] *[[Transgenerational effect]] *[[Translocation]] *[[Transmission detection system]] *[[Transparency]] *Transport of risk (see [[Transfer of risk]]) *[[Tumour suppressor gene]] *[[Trapped particles]] *[[Treatment preparation in radiotherapy]] *[[Trophic level]] *[[Types of materials]] *[[Typical value]] (for DRL) === <big><span id="U">U</span></big> === *[[Unattached fraction]] *[[Unsealed source]] *[[Upper reference levels]] *[[Uptake]] *[[Utilitarian ethics]] === <big><span id="V">V</span></big> === *[[Value judgement]] *[[Valvular heart disease]] *[[Virtue ethics]] *[[Voxel phantom]] === <big><span id="W">W</span></big> === *[[Waste disposal]] *[[Waste management]] *[[Wisdom]] *WL (see [[Working level]]) *WLM (see [[Working level month]]) *[[Worker]] *[[Working level]] *[[Working level month]] *w<sub>T</sub> (see [[Tissue weighting factor]]) *w<sub>R</sub> (see [[Radiation weighting factor]]) === <big><span id="X">X</span></big> === *[[X ray]] *[[Xerostomia]] === <big><span id="Y">Y</span></big> === === <big><span id="Z">Z</span></big> === === <big><span id="ZZ">...</span></big> === *[[α/β value]] *α/β ratio (see [[α/β value]]) *[[γH2AX foci]] <div>
