gamma reference sources at RIPS at RIKEN

RIPS group has two sets of WEAK and SEALED gamma reference sources in E6 (controlled room) in RIKEN. They were made by Amersham Buchler GmbH & co KG.

No. 387416

products code QCRB6094
Drawing VZ-1240/2

Nuclide Source no. Activity in kBq Overall uncertainty
Americium-241 FU798 42.1 3%
Barium-133 FU799 42.2 3%
Caesium-137 FU800 46.6 3%
Cobalt-60 FU801 41.2 3%
Europium-152 FU802 40.9 5%

reference date 1 January 1998
radioactive impurities Related to Cs-137, Eu-154(equal 100%) the following radioactive impurities were detected:
Cs-134:< 0.01%, Eu-154<1.10%

No. 387417

products code	QCRB6095
Drawing	VZ-1240/2

Nuclide	Source no.	Activity in kBq	Overall uncertainty
Americium-241	FU803	354	3%
Europium-152	FU804	462	4%
Barium-133	FU805	453	3%
Yttium-88	FU806	467	3%
Sodium-22	FU807	359	3%
Caesium-137	FU808	384	3%
Cobalt-60	FU809	467	3%

reference date	1 January 1998
radioactive impurities	Related to Eu-154(equal 100%) the following radioactive impurities were detected:
	Eu-154<1.06%

Nuclide	half-life^a	E_gamma[keV] (Emission Prob.)^b
Americium-241	432.27 years	26.345 (2.4%) 59.537 (36.0%)
Barium-133	10.52 years	80.998 (34.11%), 276.398 (7.15%), 302.853 (18.30%), 356.017 (61.94%), 383.851 (8.91%)
Caesium-137	30.07 years	661.660 (85.1%)
Cobalt-60	5.27 years	1173.238 (99.86%), 1332.502 (99.98%)
Europium-152	13.542 years	121.7824 (28.37%), 244.6989 (7.53%), 344.2811 (26.57%), 411.126 (2.238%), 443.965 (3.125%), 778.903 (12.97%), 867.390 (4.214%), 964.055 (14.63%), 1085.842 (10.13%), 1089.767 (1.731%), 1112.087 (13.54%), 1212.970 (1.412%), 1299.152 (1.626%), 1408.022 (20.85%)
Yttium-88	106.65 days	898.042 (94.0%), 1836.063 (99.36%)
Sodium-22	2.6019 years	1274.542 (99.94%)

*a Table of Isotope 1995
*b IAEA TECDOC-619 Evaluated Data (XG Standards)