The foil is further protected from accidental damage by a wire gauze cap
over the open window’ of the mount. The active material is enclosed in
metal foil fixed in a cylindrical mount provided with a stem of 4mm
diameter. The nature and strength of each source is clearly engraved on
its mount and it is also colour coded for identification. Each is
supplied in a small lead castle’ in a suitably labelled MDF storage box
100 x 75 x 65mm high. A data sheet is enclosed with each.
5μCi (185 kBq) of Americium241 incorporated in a silver-palladium disc
which transmits a substantial proportion of the alpha particles and a
small amount of low energy gamma emission.
