HVL
![](dev/images/h-r-.png)
half-value layer
半値層. 半値層厚. 放射線強度を半分に減衰させるアルミ金属媒質層の厚み.
half-value layer; or half thickness; defined as the thickness of aluminum filtration required to cut the (radiation) beam intensity in half; the thickness of a layer which gives a half attenuator of radiation; in r
![](dev/images/h-r-.png)
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