Lead equivalence in glass: the default value vs. a defined value.

摘要

To most health physicists, the specification of lead-equivalent thickness in a glass viewing window is a request for equal attenuation by the glass and sheet lead of the same stated thickness. A failure to specify the energy at which equivalence is desired can lead to a significant deviation from the intended attenuation value. The reason for this is an alternative or "default" definition of lead equivalence that is used by the glass suppliers when the energy information is omitted.