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Definition of Half-thickness

Half-thickness Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
(*) Thickness of absorbing material necessary to reduce by one-half the intensity of radiation which passes through it.
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )
Half-thickness Definition from Science & Technology Dictionaries & Glossaries
NRC Nuclear Energy Glossary
Any given absorber that will reduce the intensity of an original beam of ionizing radiation to one-half of its initial value.
A service to the public by The U.S. Nuclear Regulatory Commission (NRC).
Half-thickness Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
A material's half-value layer (HVL), or half-value thickness, is the thickness of the material at which the intensity of radiation entering it is reduced by one half. HVL can also be expressed in terms of air kerma rate (AKR), rather than intensity: the half-value layer is the thickness of specified material that, "attenuates the beam of radiation to an extent such that the AKR is reduced to one-half of its original value. In this definition the contribution of all scattered radiation, other than any [...] present initially in the beam concerned, is deemed to be excluded." Rather than AKR, measurements of air kerma, exposure, or exposure rate can be used to determine half value layer, as long as it is given in the description.

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