RITVERC GmbH

tel.:	+7 (812) 297 44 63 +7 (812) 297 22 69
fax:	+7 (812) 297 58 87
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Gamma radiation sources: Cesium-137 / Cs-137

¹³⁷Cs

Radionuclide characteristics

Half-life, days: 10990 ± 40

Photon energy:

Ba XK_α2	31.8174 keV (1.95±0.04%)
Ba XK_α1	32.1939 keV (3.59±0.07%)
Ba XK_β2	36.31-36.67 keV (1.055±0.022%)
Ba XK_β1	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
Code	mCi	MBq	DxH, mm	dxh, mm
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: С64344

ISO classification: С64444

Recommended working life: 15 years

Other dimensions and activities are available on request