The thickness of lead affording the same attenuation, under specified conditions, as the material in question. Used as shielding value for e.g. control windows, protective wear, etc.

Gamma rays are a form of nuclear radiation that consists of photons emitted by radioactive elements from the nucleus. This high energetic light emission is also produced from subatomic particle interaction, such as electron positron annihilation. Gamma radiation, similar to x-radiation can injure and destroy tissue, especially cell nuclei.
Gamma rays have in general very high frequencies, short wavelengths, are electrically neutral and penetrate matter. The interaction of gamma rays with matter depends on the nature of the absorber as well as the energy of the gamma rays; these interactions determine also the type and amount of shielding needed for radiation protection.

See also Radiation Safety, Lead Equivalence, Lead Apron, Leaded Glove, Glove-Box, Radioactive Decay Law and Radiation Worker.

A leaded glove is used to reduce radiation hazards. Leaded gloves made of materials containing metallic lead or lead compounds, a radiation absorbing material.

See also Glove-Box, Absorber, Radiation Shielding, and Lead Equivalence.