IEVref:881-04-34ID:
Language:enStatus: Standard
Term: half-value layer (abbreviation: HVL)
Synonym1: half-value thicknes (abbreviation: HVТ)
[Preferred]
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Definition: 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.


Publication date:1983-01
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