137CsCesium
¹³⁷CsCs-137Цезий-137Cesium-137Caesium-137
Radionuclide characteristics
Half-life, days
10990.0000 ± 40.0000
Photon energy
Line
Energy
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
Certificates and documentation
- Special form radioactive material approval certificate No. D/0098/S-96 (Rev. 1) DE (PDF)
- Certificate of conformity No. ОИАЭ.RU.192 OC.00328 RU (PDF)
Description
137Cs is incorporated in a light ceramic matrix and sealed in a welded stainless steel capsule. GCs7.27 source is also available in titanium capsule.
D × H, mm
d × h, mm
Nominal activity, mCi
Nominal activity, MBq
Code
3 × 3
2.1 × 1.5
0.0027–0.135
0.1–5
GCs7.11
3 × 10
2.1 × 1.5
0.0027–0.135
0.1–5
GCs7.12
4 × 10
3.1 × 1.5
0.0027–0.135
0.1–5
GCs7.13
7 × 10
5.2 × 2.5
0.0027–0.135
0.1–5
GCs7.14
8 × 5
4 × 1.2
0.0027–0.135
0.1–5
GCs7.15
10 × 5
8.5 × 1
0.0027–0.135
0.1–5
GCs7.16
12 × 3
8.5 × 1
0.0027–0.135
0.1–5
GCs7.17
30 × 4.5
8.5 × 1
0.0027–0.135
0.1–5
GCs7.18
10 × 4
4 × 1.2
0.0027–0.135
0.1–5
GCs7.19
6 × 10
4 × 6.1
0.0027–0.135
0.1–5
GCs7.26 **
3 × 5
2.1 × 1.5
0.0027–0.135
0.1–5
GCs7.27
6 × 9.5
3 × 4
0.0058–0.23
0.215–8.5
GCs7.46 **
* Tolerance: −10 ÷ +20 %.
** Heavy-duty capsule type; available on request.
Other activities and dimensions are available on request.
ISO classification: C64344 (GCs7.11); C64444 (GCs7.12 ÷ GCs7.19); C65546 (GCs7.26); C66444 (GCs7.27 / Stainless Steel); C65343 (GCs7.27 / Titanium); C66546 (GCs7.46).
Recommended working life: 15 years.