Page 407 - Emergency Response Book

Shielding 17

Half-Value Layer

The half-value layer (HVL) is commonly used for this purpose and to determine

what thickness of a given material is necessary to reduce the exposure rate from a

source to some level.

For example, if a Gamma source is producing 369 R/h at one foot and a four HVL

shield is placed around it, the intensity would be reduced to 23.0 R/h

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