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Calibration sources
Alpha and beta sources for calibration and operational checks of contamination monitors, probes and alpha spectrometers.
Download product sheet (PDF)All values with references – for tender documents
Specifications checked against the manufacturer’s documents on 2026-10-16
The number after each value refers to the source listed below. Values are as published by the manufacturer; the exact configuration is always confirmed in our quotation.
| Radiation | Alpha or beta1 |
|---|---|
| Standard radionuclides, EAS alpha | U-233, Pu-238, Pu-239, Am-241, Cm-2442 |
| Alpha-flux measurement uncertainty, EAS catalog | ≤1.5% at k=22 |
| Example radionuclides, EBS beta | Cl-36, Co-60, Sr-90/Y-90, Cs-137/Ba-137m, Pm-1473 |
| Active diameter, standard EAS | 15 mm2 |
|---|---|
| Active diameter, standard EBS | 3–30 mm3 |
| Active diameters, standard ESA discs | 15, 36, 44 or 110 mm4 |
| Mounting | A/B: aluminum ring; C/D: unmounted2 |
| Source formats | Point sources and wide areas: discs, planchets, rectangles or squares1 |
|---|
| Geometry options | Replace [Type] with A, B, C or D when ordering2 |
|---|
| Use | Calibration of alpha spectrometers and contamination monitors1 |
|---|---|
| Equivalent activity, EAS catalog | 0.3, 0.8 or 3 kBq, depending on nuclide2 |
| Equivalent activity, EBS catalog | 0.08 or 3 kBq3 |
| Equivalent activity, standard ESA discs | Alpha: 0.4 kBq; beta: 4 kBq4 |
| Measurement uncertainty | ≤1.5 %; k=22 |
| Manufacturing tolerance | ±30 %2 |
| Substrate and deposition | Stainless steel disk with electrodeposited radionuclides2 |
| Listed ISO 2919 class | C111112 |
The data comes from the manufacturer’s published documents. Manufacturers may change specifications; the current configuration and performance are confirmed in the quotation.
10 models in the series. Filter or scroll the table to compare.
| Model | Radionuclide2 | Alpha emission into 2π sr2 | Equivalent activity2 | Export control2 |
|---|---|---|---|---|
| 9ML04 EAS [Type] 25 | ²³⁹Pu / ²⁴¹Am / ²⁴⁴Cm | 400 α/s | 0.8 kBq | Subject to dual-use export control (EC Regulation 428/2009); an end-user certificate is requested |
| AM241 EAS [Type] 20 | ²⁴¹Am | 150 α/s | 0.3 kBq | – |
| AM241 EAS [Type] 30 | ²⁴¹Am | 1500 α/s | 3 kBq | – |
| CM244 EAS [Type] 20 | ²⁴⁴Cm | 150 α/s | 0.3 kBq | – |
| CM244 EAS [Type] 30 | ²⁴⁴Cm | 1500 α/s | 3 kBq | – |
| PU238 EAS [Type] 20 | ²³⁸Pu | 150 α/s | 0.3 kBq | – |
| PU238 EAS [Type] 30 | ²³⁸Pu | 1500 α/s | 3 kBq | – |
| PU239 EAS [Type] 20 | ²³⁹Pu | 150 α/s | 0.3 kBq | Subject to dual-use export control (EC Regulation 428/2009); an end-user certificate is requested |
| PU239 EAS [Type] 30 | ²³⁹Pu | 1500 α/s | 3 kBq | Subject to dual-use export control (EC Regulation 428/2009); an end-user certificate is requested |
| U233 EAS [Type] 20 | ²³³U | 150 α/s | 0.3 kBq | Subject to dual-use export control (EC Regulation 428/2009); an end-user certificate is requested |
The number after each value refers to the source listed below. Values are as published by the manufacturer; the exact configuration is always confirmed in our quotation.
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