Beta Particle Standards – Type A1

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.

1”

0.805”

0.125”

25.4 mm

20.4 mm

3.18 mm

Evaporated Salts on 0.010” Stainless Steel

5 nCi -100 nCi (185 Bq – 3.7 kBq)

Bi-210: 10 nCi – 100 nCi (370 Bq – 3.7 kBq)Sr-90 : 2.5 nCi -100 nCi (92.5 Bq -3.7 kBq)

Bi-210

BF-210-A

370 Bq – 37 kBq

Pb-210 parent

C-14

BF-014-A

370 Bq – 37 kBq

Cl-36

BF-036-A

370 Bq – 37 kBq

Co-60

BF-060-A

370 Bq – 37 kBq

Cs-137

BF-137-A

370 Bq – 37 kBq

Ge-68¹⁾

BF-068-A

370 Bq – 37 kBq

On Request

Na-22

BF-022-A

370 Bq – 37 kBq

Pm-147

BF-147-A

370 Bq – 37 kBq

Ru-106/Rh-106

BF-106-A

370 Bq – 37 kBq

Si-32/P-32²⁾

BF-032-A

370 Bq – 1,85 kBq

Sn-113

BF-113-A

370 Bq – 37 kBq

on platinum foil only

Sr-90/Y-90³⁾

BF-090-A

370Bq

Sr-90/Y-90³⁾

1,85 kBq – 18,5 kBq

Tc-99

BF-099-A

370Bq – 37 kBq

Tl-204

BF-204-A

370Bq – 37 kBq