half-value layer

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half-value layer

[′haf ¦val·yü ‚lā·ər]
(physics)
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2)Capability to deliver a range of at least 4 energies, user selectable and interlocked from within a range of at least 50 kVp - 220 kVp, corresponding to typical half value layers of 1 mm Aluminium through to 2 mm Copper.
As a result, the half value layers for Gamma-Rays have decreased by approximately a factor of two.