Beta Nuclide 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.
| Catalog Number | Nuclide | Half-Life | Substrate | Beta Energies (E-max keV) | Window |
|---|---|---|---|---|---|
| BF-210-A | Bismuth-210 | 22.3 y | Stainless Steel | 1160 | 6.9 mg/cm2 Aluminum |
| BF- 014-A | Carbon-14 | 5730 y | Polymeric Membrane | 156 | 0.9 mg/cm2 Aluminized Mylar |
| BF-137-A | Cesium-137 | 30.17 y | Stainless Steel | 1175 | 0.9 mg/cm2 Aluminized Mylar |
| BF-036-A | Chlorine-36 | 3.01 x 105 y | Stainless Steel | 1142 | 0.9 mg/cm2 Aluminized Mylar |
| BF-060-A | Cobalt-60 | 5.272 y | Stainless Steel | 1491 | 0.9 mg/cm2 Aluminized Mylar |
| BF-068-A | Germanium-68 (1) | 270.8 d | Stainless Steel | 2921 (β+) | 0.9 mg/cm2 Aluminized Mylar |
| BF-147-A | Promethium-147 | 2.6234 y | Stainless Steel | 225 | 0.9 mg/cm2 Aluminized Mylar |
| BF-106-A | Ruthenium-106 /Rhodium-106 | 1.020 y | Stainless Steel | 39, 3540 | 0.9 mg/cm2 Aluminized Mylar |
| BF-032-A | Silicon-32/ Phosphorus-32 (2) | 104 y | Stainless Steel | 225, 1710 | 13.7 mg/cm2 Aluminum |
| BF-022-A | Sodium-22 | 950.8 d | Stainless Steel | 2842 (β+) | 0.9 mg/cm2 Aluminized Mylar |
| BF-090-A | Strontium-90/Yttrium-90 (3) | 28.5 y | Stainless Steel | 546, 2282 | 0.9 mg/cm2 Aluminized Mylar |
| BF-099-A | Technetium-99 | 2.13 x 105 y | Stainless Steel | 294 | 0.9 mg/cm2 Aluminized Mylar |
| BF-204-A | Thallium-204 | 3.78 y | Stainless Steel | 763 | 0.9 mg/cm2 Aluminized Mylar |
| BF-113-A | Tin-113 | 115.1 d | Platinum Foil or Pt/Clad Ni | 392 | 0.9 mg/cm2 Aluminized Mylar |
Overall Diameter: 1 inch (25.4 mm)
Active Diameter: 0.805 inch (20.4 mm)
Height: 0.125 inch (3.18 mm)
Nature of Active Deposit: Evaporated Salts on 0.010” Stainless Steel
Available Activities: 5 nCi -100 nCi (185 Bq - 3.7 kBq)
Exceptions:
Bi-210 : 10 nCi - 100 nCi (370 Bq - 3.7 kBq)
Sr-90 : 2.5 nCi - 100 nCi (92.5 Bq - 3.7 kBq)
Beta Particle Standards—Type MF2
This is a “scatterless” configuration in which the activity is applied as a 0.12” (3 mm) spot centered between two laminated 0.9 mg/cm2 aluminized Mylar foils. The source is supplied in a removable aluminum holder. In the holder the source has an overall diameter of 1” (25.4 mm) and a thickness of 0.125” (3.18 mm). Out of the holder the source is 0.937” (23.8 mm) in diameter with a thickness of approximately 0.030” (0.76 mm). This configuration is most useful for the precise determination of G.M. and proportional counter efficiencies, and as an educational tool for the verification of the inverse square law, as well as demonstrating back-scatter phenomena. Additional beta sources are available, including disk standards suitable for use with low background counting systems and 3.94” x 3.94” (100 mm x 100 mm) distributed beta sources for instrument calibration and dose assessments.
| Catalog Number | Nuclide | Half-Life | Substrate | Beta Energies (E-max keV) | Window |
|---|---|---|---|---|---|
| BF-014-MF2 | Carbon-14 | 5730 y | Polymeric Membrane | 156 | 0.9 mg/cm2 Aluminized Mylar |
| BF-137-MF2 | Cesium-137 | 30.17 y | Stainless Steel | 1175 | 0.9 mg/cm2 Aluminized Mylar |
| BF-036-MF2 | Chlorine-36 | 3.01 x 105 y | Stainless Steel | 1142 | 0.9 mg/cm2 Aluminized Mylar |
| BF-060-MF2 | Cobalt-60 | 5.272 y | Stainless Steel | 1491 | 0.9 mg/cm2 Aluminized Mylar |
| BF-068-MF2 | Germanium-68(1) | 270.8 d | Stainless Steel | 2921 (β+) | 0.9 mg/cm2 Aluminized Mylar |
| BF-147-MF2 | Promethium-147 | 2.6234 y | Stainless Steel | 225 | 0.9 mg/cm2 Aluminized Mylar |
| BF-106-MF2 | Ruthenium-106 /Rhodium-106 | 1.020 y | Stainless Steel | 39, 3540 | 0.9 mg/cm2 Aluminized Mylar |
| BF-022-MF2 | Sodium-22 | 950.8 d | Stainless Steel | 2842 (β+) | 0.9 mg/cm2 Aluminized Mylar |
| BF-090-MF2 | Strontium-90 /Yttrium-90(2) | 28.5 y | Stainless Steel | 546, 2282 | 0.9 mg/cm2 Aluminized Mylar |
| BF-099-MF2 | Technetium-99 | 2.13 x 105 y | Stainless Steel | 294 | 0.9 mg/cm2 Aluminized Mylar |
| BF-204-MF2 | Thallium-204 | 3.78 y | Stainless Steel | 763 | 0.9 mg/cm2 Aluminized Mylar |
1) Positron emission from Ga-68.
2) Sr-90 sources are certified as to the contained activity of the Sr-90 only. Sr-90, a beta emitter, is in equilibrium with the Y-90 daughter. Thus, a 1 μCi (37 kBq) Sr-90 source also contains 1 μCi (37 kBq) of Y-90. When comparing sources in similar geometries (i.e., similar backing, cover and source detector distance) good results should be obtained. Sr-90 has an average beta energy of 196 keV and Y-90 has an average beta energy of 934 keV, thus care must be taken when comparing sources of substantially different geometries since effects such as backscatter and window absorption
must be considered.
Overall Diameter: 1 inch (25.4 mm)
Active Diameter: 0.12 inch (3 mm)
Height: 0.125 inch (3.18 mm)
Nature of Active Deposit: Evaporated Salts on Mylar
Available Activities: 5 nCi -100 nCi (185 Bq - 3.7 kBq)
Exceptions:
Bi-210 : 10 nCi - 100 nCi (370 Bq - 3.7 kBq)
Sr-90 : 2.5 nCi - 100 nCi (92.5 Bq - 3.7 kBq)
