half-value layer
noun
half-val·ue layer
-ˈval-(ˌ)yü-, -ˈval-yə- 
: the thickness of an absorbing substance necessary to reduce by one half the initial intensity of the radiation passing through it
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“Half-value layer.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/half-value%20layer. Accessed 29 Nov. 2024.
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