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Standard and testing sources: Point gamma standard spectrometry sources set / "OSGI-R" - set

Application: Gamma standard sources ("OSGI-R"-set) are used as working standards for verification and graduation of photon measuring equipment, for certification of measuring methods and measurement accuracy control of photon emission. "In particular, the set is intended for testing and calibration of precision instruments, spectrometers and radiometers, ionization chambers and scintillation counters. "OSGI-R"-set is especially designed for use in testing and calibration of spectrometers used in environmental analysis.
Description: The source is produced in the form of a flat round capsule made of aluminum, 25 mm in diameter and 3 mm thick. The source active part of less than 3 mm in diameter is embedded between two polyimide foils with total thickness of 100 ± 10 µm.

Radionuclide

Decay mode Half-life, days Photon energy,
keV
Probabilities
(gamma per decay)

Nominal
activity, kBq *

Exposure dose rate,
μSv/h
Na-22 EC 950.570.23 511 (annihil) 1.7980.002 1-1000 ≤35
1274.5370.003 0.999400.00014
Ti-44 EC 2190015 68.8680.014 0.9300.0015 1-100 ≤0.2
78.360.03 0.964 0.0011
1157.0200.015 0.998750.0003
Mn-54 EC 312.290.26 834.8380.005 0.9997460.000011 1-1000 ≤14
Fe-55 EC 1002.72.3 (Mn Kα) 5.8988 0.16560.0027 1-1000 ≤0.002
(Mn Kβ) 6.49-6.54 0.03400.007
Co-57 EC 271.800.05 14.412950.00031 0.09150.0017 1-1000 ≤2.3
122.060650.00012 0.85510.0006
136.473560.00029 0.10710.0015
Co-60 β- 1925.230.27 1173.2280.003 0.99850.0003 1-300 ≤35
1332.4920.004 0.9998260.000006
Zn-65 EC 243.860.20 511 (annihil) 0.02840.0004 1-1000 ≤8
1115.5390.002 0.50600.0022
Y-88 EC 106.6250.024 898.0360.004 0.93900.0023 1-1000 ≤44
1836.0520.013 0.99380.0003
Cd-109 EC 461.41.2 88.03360.0011 0.036260.00020 1-1000 ≤5
Sn-113 EC 115.090.04 391.6980.003 0.64940.0017 1-500 ≤1.5
Ba-133 EC 3848.71.2 80.99790.0011 0.3290.003 1-1000 ≤8
276.39890.0012 0.07160.0005
302.85080.0005 0.18340.0013
356.01290.0007 0.62050.0019
383.84850.0012 0.08940.0006
Cs-134 β- 753.51.0 569.3270.003 0.15380.0004 1-300 ≤7
604.7200.003 0.976500.00018
795.830.03 0.8550.003
Cs-137 β- 1099040 661.6570.003 0.84990.0020 1-1000 ≤9
Ce-139 EC 137.6420.020 165.85750.0011 0.79900.0004 1-1000 ≤3.5
Eu-152 EC 49417 121.78170.0003 0.28410.0013 1-1000 ≤17
344.27850.0012 0.26580.0012
778.90450.0024 0.12960.0006
964.0720.018 0.14620.0006
1085.8370.010 0.10130.0006
1112.0760.003 0.13400.0006
1408.0130.003 0.20850.0009
Bi-207 EC 11800300 569.6980.002 0.97760.0003 1-100 ≤2.2
1063.6560.003 0.74580.0049
1770.2280.009 0.06870.0002
Th-228 α 6702 39.86 ÷ 2614.53 1.03 – 36.06 1-50 ≤0.8
Am-241 α 157850230 26.34460.0002 0.02400.0003 1-300 ≤0.1
59.54090.0001 0.35780.0009

* Other activities are available on request

Reference data:
Update of x ray and gamma ray decay data standards for detector calibration and other applications (IAEA), volume 1, 2007

Expanded uncertainty for coverage factor k=2: 3%

Recommended working life and intercalibration interval


Radionuclide

Recommended working
life, years
Intercalibration
interval, years
Am-241 5 (activity < 10 Bq) 2
3 (activity > 10 q) 1

Mn-54, Co-57, Zn-65, Y-88, Cd-109, Sn-113, Ce-139

4 1

Na-22, Fe-55, Cs-134

10 2

Co-60, Cs-137, Ba-133,Eu-152, Bi-207

12 2


Holder type Overall geometric dimensions Active part, d, mm,
not more than
Active area, mm2,
not more than
D, mm H, mm
Holder a 25 3 3 7.07
Holder b 29 3