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 radiati.....
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http://en.wikipedia.org/wiki/Half-value_layer
the thickness of a specified material that reduces the exposure rate to 50 per cent; the second HVL is the additional thickness necessary to reduce the exposure rate to 25 percent of the initial value NOTE - Measurements of HVL are performed under narrow beam conditions.
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=881-04-34
<radiobiology> The thickness of a specified material (usually a specific absorber), which attenuates a beam of radiation so that the exposure rate or absorbed dose rate at a specified point is reduced by half. ... (20 Sep 2002) ...
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http://www.encyclo.co.uk/local/20973
the thickness of a given substance that, when introduced in the path of a given beam of rays, will reduce its intensity by one half.
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http://www.encyclo.co.uk/local/21001
(HVL) Type: Term Definitions: 1. the thickness of a specific absorber (aluminum) that will reduce the intensity of a beam of radiation to one-half its initial value.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=48363
No exact match found.
