Gamma radiation sources: Cesium-137 / Cs-137
137Cs
| |
Ba XKα2 | 31.8174 keV (1.95±0.04%) |
Ba XKα1 | 32.1939 keV (3.59±0.07%) |
Ba XKβ2 | 36.31-36.67 keV (1.055±0.022%) |
Ba XKβ1 | 37.26-37.43 keV (0.266±0.008%) |
γ | 661.657±0.003 keV (84.99±0.20%) |
Reference data:
Update of x ray and gamma ray decay data standards for detector calibration and other applications (IAEA), volume 1, 2007
137Cs is incorporated in ceramic matrix and sealed in a welded stainless steel capsule.

Code | Nominal
activity * | DxH, mm | dxh, mm | |
mCi | MBq | |||
GCs7.11 ** | 0.0027-0.135 | 0.1-5 | 3x3 | 2.1x1.5 |
GCs7.12 | 0.0027-0.135 | 0.1-5 | 3x10 | 2.1x1.5 |
GCs7.13 | 0.0027-0.135 | 0.1-5 | 4x10 | 3.1x1.5 |
GCs7.14 | 0.0027-0.135 | 0.1-5 | 7x10 | 5x2.5 |
GCs7.15 | 0.0027-0.135 | 0.1-5 | 8x5 | 4x1.2 |
* Tolerance: ±10%
** ISO classification: Ñ64344
ISO classification: Ñ64444
Recommended working life: 15 years
Other dimensions and activities are available on request