Beta Particle Standard – Type A

Beta Particle Standards—Type A
The active material is uniformly distributed over the surface of a 0.937” (23.8 mm) diameter foil and sealed in an aluminum mounting ring under a 0.9 mg/cm² aluminized Mylar window for most nuclides. The active diameter of the source is 0.805” (20.4 mm). Special absorbers may be included under the window to filter undesirable low energy radiation. This configuration is most useful for determining efficiencies of G.M. and windowless counters used for beta assaying evaporated liquid samples. The overall source diameter is 1” (25.4 mm) and 0.125” (3.18 mm) thick.

Activites up to 37 kBq