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ICRP Glossary

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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.

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 [[ICRP publications]].

----

{| class="wikitable"

|-

| [[#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|...]]

|}

=== <big>0-9</big> ===

*4DCT (see [[Time-resolved computed tomography]])

=== <big>A</big> ===

*[[Absolute risk]]

*[[Absorbed dose]], D

*[[Absorbed fraction]]

*[[Absorption]]

*[[Accelerated fractionation]]

*[[Accountability]]

*[[Accreditation]]

*[[Action Level]]

*[[Activation]]

*[[Active detection system]]

*[[Active (red) bone marrow]]

*[[Activity]]

*[[Activity median thermodynamic diameter]]

*[[Acute exposure]]

*Acute radiation sickness (see *[[Acute radiation syndrome]])

*[[Acute radiation syndrome]]

*[[Additional dose]]

*[[Adaptive response]]

*[[Additive risk projection model]]

*[[Adenoma]]

*[[Adventitious]]

*[[Aerodynamic diameter ]]

*[[Air-kerma rate constant ]] *[[Air kerma at the patient entrance reference point]]

*[[Air-kerma, entrance surface]]

*[[Air-kerma, product]]

*[[ALARA]]

*ALI (see [[Annual limit on intake]])

*[[Alimentary tract]]

*[[Alimentary tract transfer factor]]

*[[Allometry]]

*[[Alpha decay]]

*[[Alveolar-interstitial region]]

*AMAD (see [[Activity median aerodynamic diameter]])

*[[Ambient dose equivalent]], H*(10)

*[[AML/eto]]

*[[Angiogenesis]]

*[[Annual dose]]

*[[Annual intake]]

*[[Annual limit on intake]]

*[[Apoptosis]]

*[[Area monitoring]]

*[[Autoimmune disease]]

*[[Automatic exposure control]]

*[[Autonomy]]

*[[Background dose (rate)]]

*[[Backscatter detection system]]

*[[Backscatter factor]]

*BAT (see [[Best available techniques]])

*Bcr/abl (see [[Breakpoint cluster region/abelson]])

*[[Beneficence]]

*[[Bioassay]]

*[[Biological half-life]]

*[[Biomarker]]

*[[Bradycardia]]

*[[Brachytherapy]]

*[[Branching fraction]]

*[[Bragg peak]]

*[[Breakpoint cluster region/abelson]]

*[[Broad beam therapy irradiation technique]]

*[[Bronchial region]]

*[[Bronchiolar region]]

*[[Bystander effect]]

=== <big>C</big> ===

*CACA (see [[Cobblestone area forming cell assay]])

*CAFC (see [[Cobblestone area forming cell assay]])

*CBCT (see [[Cone beam computed tomography]])

*[[Cardiac arrhythmias]]

*[[Cardioverter-defibrillator]]

*[[Carers and comforters]]

*[[Case–control study]]

*[[Cell death]]

*[[Charged-particle equilibrium]]

*[[Chronic exposure]]

*[[Class SR-2 gases]]

*[[Clearance]]

*[[Clearance level]]

*[[Clinical audit]]

*[[Clonogenic cells]]

*[[Clonogenic survival]]

*[[Clonogenic surviving fraction]]

*Cobblestone area cell assay (see [[Cobblestone area forming cell assay]])

*[[Cobblestone area forming cell assay]]

*[[Collective dose]]

*[[Co-expertise]]

*[[Cohort study]]

*[[Collective dose]]

*[[Collective effective dose]]

*[[Collimation]]

*[[Colony]]

*[[Commissioning]]

*[[Committed effective dose]]

*[[Committed equivalent dose]]

*[[Compartment]]

*[[Compartment (environmental)]]

*[[Complex tissues]]

*[[Computed tomography dose index]]

*[[Concentration ratio]]

*[[Cone beam computed tomography]]

*[[Connective tissue]]

*[[Constancy test]]

*[[Containment]]

*[[Contamination]]

*[[Coronary heart disease]]

*[[Cosmic radiation]]

*[[Cost-benefit analysis]]

*[[Coster-Kronig transition]]

*CR (see [[Concentration ratio]])

*[[Cross section]]

*Cumulative air kerma (see [[Air kerma at the patient entrance reference point]])

*[[Cumulative dose]]

*[[Curie]]

=== <big>D</big> ===

*DAC (see [[Derived air concentration]])

*DBT (see [[Digital breast tomosynthesis]])

*DCRL (see [[Derived consideration reference level]])

*DD (see [[Doubling dose]])

*DDI, detector dose indicator (see [[Exposure index]])

*DIL (see [[Derived investigation level]])

*DDREF (see [[Dose and dose-rate effectiveness factor]])

*[[Decontamination factor]]

*[[Dental and maxillofacial imaging]]

*[[Deontological Ethics]]

*[[Deposition]] (inhalation)

*[[Derived air concentration]]

*[[Derived consideration reference level]]

*[[Derived investigation level]]

*[[Derived limit]]

*[[Derived reference level]]

*[[Designated area]]

*Detector dose indicator (see [[Exposure index]])

*[[Detector quantum eﬃciency]]

*[[Deterministic effect]]

*[[Detriment-adjusted risk]]

*[[Diagnostic reference level]]

*[[Diastasis]]

*[[Differentiation]]

*[[Digital breast tomosynthesis]]

*[[Dignity]]

*[[Direct bioassay]]

*[[Directional dose equivalent]] H’(d,Ω)

*[[Disposal]]

*[[Disposal facility]]

*[[Distribution coefficient]] (''Kd'')

*DLP (see [[Dose-length product]])

*[[DNA damage signalling]]

*[[Dose]] (of ionising radiation)

*[[Dose and dose-rate effectiveness factor]]

*[[Dose coefficient]]

*[[Dose commitment]]

*[[Dose constraint]]

*[[Dose conversion coefficient]]

*[[Dose conversion convention]]

*[[Dose conversion factor]]

*[[Dose criteria]]

*[[Dose equivalent ]] in an organ or tissue]]

*[[Dose limit]]

*[[Dose modifying factor]]

*[[Dose of record (E)]]

*[[Dose of record Hp (10)]]

*[[Dose per content function]]

*[[Dose per unit intake coefficient]]

*[[Dose rate effectiveness factor]]

*[[Dose-length product]]

*[[Dose-threshold hypothesis]]

*[[Dose-rate effect]]

*[[~~Dose–response~~ Dose-response function ]]

*[[Dose-threshold]]

*[[Doubling dose]]

*DQE (see [[Detector quantum eﬃciency]])

*DRL (see [[Diagnostic reference level]])

*[[DRL process]]

*[[DRL quantity]]

*[[DRL value]]

*[[DS02]]

*[[DS86]]

=== <big>E</big> ===

*[[Effective charge number]]

*[[Effective dose]], E

*[[Effective dose equivalent]]

*[[Effective half-life]]

*EI (see [[Exposure index]])

*[[Electron-capture decay]]

*[[Emergency procedures]]

*[[Employer]]

*[[Endogeneous excretion]]

*Endosteal tissue (see [[~~Epigenetic effects~~Endosteum]]) *[[Endosteum]]

*[[Environmental exposure]]

*[[Environmental radiation protection]]

*[[Epigenetic effects]]

*[[Epithelium]]

*[[Equieffective dose]]

*[[Equilibrium equivalent concentration]]

*[[Equilibrium factor]]

*[[Equity]]

*[[Ethics]]

*[[Evacuation]]

*[[Excess absolute risk]]

*[[Excretion rate (instantaneous)]]

*[[Exclusion]]

*[[Exempt waste]]

*[[Existing exposure situation]]

*[[Exogenous excretion]]

*[[Expanded and aligned radiation field]]

*[[Expanded radiation field]]

*[[Exponential survival curve]]

*[[Exposed individuals]]

*[[Exposure, external or internal]]

*[[Exposure (in the context of inhalation)]]

*[[Exposure index]]

*[[Exposure pathway]]

*[[Flexible tissues]]

*[[Fluence]], Φ

*[[Fluoroscopically guided interventions]]

*[[Fluoroscopically or computed tomography guided interventions]]

*[[Forbiddenness]]

*[[Fractional absorption in the gastrointestinal tract]], f1

*[[Fractionation]]

*[[Fractionation and dose delivery patterns]]

*[[Fractionation sensitivity]]

*[[Frequent flyer]]

*FSU (see [[Functional subunits]])

*[[Functional subunits]]

=== <big>G</big> ===

*[[Gastrointestinal syndrome]]

*[[Gastrulation]]

*[[Gastroschisis]]

*[[GATA binding protein 2]]

*GATA-2 (see [[GATA binding protein 2]])

*[[Genomic integrity]]

*Geomagnetic cut-off rigidity (see [[Rigidity threshold]])

*[[Graded approach]]

*[[Graft vs host disease]]

*[[Granulocyte colony-stimulating factor]]

*[[Granulocyte-macrophage colony-stimulating factor]]

*[[Gray]] (Gy)

*[[Ground-level enhancement]]

*[[Growth factor]]

*[[Growth fraction]]

*[[Half-life, physical]]

*HATM (see [[Human Alimentary Tract Model]])

*[[Hazard]]

*[[High level waste]]

*[[High linear energy transfer radiation]]

*[[Homologous recombination]]

*[[Hormones]]

*[[Hounsﬁeld unit]] *HRTM (see [[Human ~~respiratory tract model~~Respiratory Tract Model]]) *[[Human Alimentary Tract Model]] *[[Human Respiratory Tract Model]]

*[[Hyperbaric oxygen]]

*[[Hyperfractionation]]

*[[Hypertrophic cardiomyopathy]]

=== <big>I</big> ===

*[[ICRU 4-element tissue]]

*[[ICRU sphere]]

*[[Immune system]]

*IMRT (see [[Intensity-modulated radiotherapy]])

*[[In vivo radiobioassay]]

*[[Institutional control]]

*[[Intervention]]

*[[Intensity-modulated radiotherapy]]

*[[Intake]]

*[[Intermediate level waste]]

=== <big>K</big> ===

*[[Kerma]], K

*[[Kerma approximation]]

*[[Kp index]]

=== <big>L</big> ===

*[[Lag]]

*[[Late normal tissue responses]]

*[[LD 50/30|LD50/30]]

*LET (see [[Linear energy transfer]])

*[[Licensee]]

*[[Life Span Study]]

*[[Linear dose response]]

*[[Linear energy transfer]]

*[[Linear-non-threshold model]]

*LLE (see [[Lifetime risk estimates]])

*[[Local DRL]]

*Loss of Life Expectancy (see [[Lifetime risk estimates]])

*[[Low level waste]]

*[[Low linear energy transfer radiation]]

*LSS (see [[Life Span Study]])

*[[Magnetosphere]]

*[[Marrow cellularity]]

*[[Mass median diameter]]

*MDCT (see [[Multi-detector computed tomography]])

*[[Mean glandular dose]]

*[[Measured quantity]]

*[[Medical exposure]]

*[[Mitigation]]

*MMD (see [[Mass median diameter]])

*[[Molecular imaging]]

*[[Multifactorial diseases]]

*[[Multiplicative risk projection model]]

*[[Multistage tumorigenesis]]

*[[Multitarget equation]]

*[[Multi-detector computed tomography]]

*[[Mutation component]]

=== <big>N</big> ===

*[[National radon survey]]

*[[National DRL]]

*[[Naturally occurring radioactive material]]

*NHEJ (see [[Non-homologous end joining]])

*[[Noise]] (in imaging)

*[[Nominal value]]

*[[Nominal risk coefficient]]

*[[Normal tissue complication probability]]

*[[Notiﬁcation value]] (in CT)

*[[Nuclear medicine]]

*[[Nuclear track detectors]]

=== <big>O</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>P</big> ===

*Particle fluence (see [[Fluence]])

*[[Particle transport]] (in biokinetics)

*[[Particle radiance]]

*[[Pelagic]]

*[[Pencil beam]]

*[[Percutaneous coronary intervention]]

*[[Pericarditis]]

*[[Personal dose equivalent]], Hp(d)

*[[Phantom]]

*[[Pharynx]]

*[[Pilomatricoma]]

*[[Planned exposure situation]]

*[[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 optimisation]]

*[[Principles of protection]]

*[[Procedural values]]

*[[Projected dose]]

*[[Protection quantities]]

*[[Protection strategy]]

*[[Qualified expert]]

*[[Quality control testing]] (x-ray equipment)

*[[Quality factor]], Q(L)

*[[Quasi-threshold dose]]

*[[Radiation source]]

*[[Radiation weighting factor]], wR *[[Radiation-induced second cancer]] *[[Radiation-induced secondary malignancy]]

*[[Radiation worker]]

*[[Radioactive substance]]

*[[Radioactive waste]]

*[[Radioactivity]]

*[[Radiographer]]

*[[Radiological attack]]

*[[Radiological controlled area]]

*[[Radiosensitivity, cellular]]

*[[Radon progeny]]

*[[Radon-prone area]]

*RAP (see [[Reference Animal and Plant]])

*[[Ras]]

*[[Rb]]

*RBE (see [[Relative biological effectiveness]])

*[[Recovery (cellular or tissue)]]

*[[Redox]]

*[[Reference air kerma]]

*[[Reference Animal and Plant]]

*[[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 risk]]

*[[Relative survival]]

*[[Relocation]]

*[[Respiratory protection]]

*Response function (see [[Dose-response function]])

*[[Retrievability]]

*[[Risk model]]

*RISM (see [[Radiation-induced secondary malignancy]])

*Risk of exposure-induced death (see (see [[Lifetime risk estimates]])

=== <big>S</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]]

*[[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]]

*[[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]]

*[[Substantial radiation dose level]]

*[[Superposition principle]] (in dosimetry)

*[[Supervised area]]

*[[Surface contamination]]

*[[Systemic model]]

=== <big>T</big> ===

*[[Tachycardia]]

*[[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]]

*[[Tolerability]]

*[[Tolerance dose]] (in Radiotherapy)

*[[Track structure]]

*[[Translocation]]

*[[Transmission detection system]]

*[[Transparency]]

*[[Trapped particles]]

*[[Treatment preparation in radiotherapy]]

*[[Trophic level]]

*[[Types of materials]]

*[[Typical value]] (for DRL)

=== <big>U</big> ===

*[[Unattached fraction]]

*[[Unsealed source]]

*[[Upper reference levels]]

*[[Uptake]]

*[[Utilitarian ethics]]

*[[Virtue ethics]]

*[[Voxel phantom]]

=== <big>W</big> ===

*[[Waste disposal]]

*[[Waste management]]

*[[Wisdom]]

*WL (see [[Working level]])

*WLM (see [[Working level month]])

*[[Worker]]

*[[Working level]]

*[[Working level month]]

*wT (see [[Tissue weighting factor]])

Chris Clement

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