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Gamma radiation sources: Cesium-137 / Cs-137

137Cs
Radionuclide characteristics
Half-life, days: 10990 ± 40
Photon energy:

Ba XKα231.8174 keV (1.95±0.04%)
Ba XKα132.1939 keV (3.59±0.07%)
Ba XKβ236.31-36.67 keV (1.055±0.022%)
Ba XKβ137.26-37.43 keV (0.266±0.008%)
γ661.657±0.003 keV (84.99±0.20%)
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: 64344

ISO classification: 64444

Recommended working life: 15 years

Other dimensions and activities are available on request

 

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