We now offer a selection of exempt quantity gamma sources encapsulated in standard size test tubes or rods for use with well type radiation detectors. These sources are exempt sources and of nominal activity. The isotope is deposited as a point source in the bottom of the tube and is then sealed with epoxy. Two tube sizes are stocked as standard, 13x100mm and 12x75mm, which is shipped as the standard if the other size is not specified. Rods are available as 5" x 0.375" -which will be shipped as the standard if the 0.5" diameter rod is not specified and 5" x