Nev. Admin. Code § 459.450 - "Half-value layer" defined
"Half-value layer," abbreviated as "HVL," means the thickness of specified material which attenuates the beam of radiation to an extent that the exposure rate is reduced to one-half of its original value. In this definition the contribution of all scattered radiation, other than any which may be present initially in the beam concerned, is considered excluded.
Notes
NRS 459.201
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