A2 Capsule Type

Alpha Particle Standards—Type A-2

The type A-2 source is permanently fixed in an aluminum holder 0.5” diameter x 0.250” high (12.7 mm x 6.35 mm).

The active diameter is 0.197” (5.0 mm).

Alpha Standards Type A-2

All alpha standards are offered as spectral grade sources up to the activity and active diameters listed unless otherwise noted. All electroplated alpha standards are manufactured to a tolerance of +/-30% of the nominal activity.

Nuclide Product code Activity range Remark
Am-241 AF-241-A2 185 Bq – 37 kBq
Cf-252 AF-252-A2 185 Bq – 37 kBq
Cm-244 AF-244-A2 185 Bq – 37 kBq
Gd-148 AF-148-A2 185 Bq – 3,7 kBq
Np-237 AF-237-A2 185 Bq maximum activity, Not supplied as spectroscopy grade sources.
Po-210 AF-210-A2 185 Bq – 37 kBq
Pu-238 AF-238P-A2 185 Bq – 37 kBq
Pu-239 AF-239-A2 185 Bq – 370 Bq
Ra-226 AF-226-A2 185 Bq – 3,7 kBq Not necessarily in equilibrium with daughters at time of shipment.Ra-226 will leak Rn-222 gas.
Th-228 AF-228-A2 185 Bq – 18,5 kBq Not necessarily in equilibrium with daughters at time of shipment.Th-228 will leak Rn-220 gas.
Th-230 AF-230-A2 185 Bq – 3,7 kBq
Th-232 AF-232-A2 Not available
U-235 AF-235-A2 15 Bq maximum activity, Not supplied as spectroscopy grade sources.Not necessarily in equilibrium with daughters at time of shipment.
U-238 (Nat) AF-238(Nat)-A2 1,85 Bq maximum activity, Not supplied as spectroscopy grade sources.Not necessarily in equilibrium with daughters at time of shipment.
U-238D AF-238D-A2 1,18 Bq maximum activity, Not supplied as spectroscopy grade sources.Not necessarily in equilibrium with daughters at time of shipment.