The foil is further protected from accidental damage by a wire gauze cap
over the open window’ of the mount. 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. The active material is enclosed in metal foil fixed in a
cylindrical mount provided with a stem of 4mm diameter.
5μCi (185 kBq) of Cobalt60 covered by an aluminium disc to shield beta particles so that only gamma radiation is emitted.
