IAEA RGTh-1 Reference Material - 700 - 1200 keV -Practical Gamma-Ray Spectrometry

IAEA RGTh-1 Reference Material - 700 - 1200 keV

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This spectrum was measured using a 45% n-type detector, mounted in a standard 10cm thick cylindrical graded shield, in a routine laboratory at typical altitude with no special background suppression facilities. The material is IAEA RGTh-1 reference material. The spectrum represents 120 ml of that, measured in a cylindrical container stood on the detector face. Sample height was 41 mm. There is a small amount of uranium in this material and the spectrum contains peaks from the ^235,238U decay series from that and the natural background. The are a number of inidentified peaks in the spectrum that could well be coincidence sum peaks.

	Measured Energy (keV)	True Energy (keV)	Peak Counts	Nuclide	Emission Probability (%)	Source of radiation
1	701.64	701.76	2809	²²⁸Ac	0.173	²³²Th series
2	707.58	707.41	2267	²²⁸Ac	0.155	²³²Th series
3	722.22	722	1099	²⁰⁸Tl	0.24	²³²Th series
4	726.63	726.86	11996	²²⁸Ac	0.62	²³²Th series
		727.33		²¹²Bi	6.74	²³²Th series
5	755.24	755.31	16403	²²⁸Ac	1	²³²Th series
6	763.34	763.2	9375	²⁰⁸Tl	1.79	²³²Th series
7	768.35	768.36	927	²¹⁴Bi	4.891	²³⁸U series (²²⁶Ra)
8	772.29	772.29	22738	²²⁸Ac	1.49	²³²Th series
9	782.07	782.14	8042	²²⁸Ac	0.485	²³²Th series
10	785.44	785.37	16906	²¹²Bi	1.11	²³²Th series
		785.96		²¹⁴Pb	1.064	²³⁸U series (²²⁶Ra)
11	794.89	794.95	66094	²²⁸Ac	4.25	²³²Th series
12	816.74	816.71	921	²²⁸Ac	0.03	²³²Th series
13	830.34	830.49	8460	²²⁸Ac	0.54	²³²Th series
14	835.66	835.71	25456	²²⁸Ac	1.61	²³²Th series
		835.9		²⁰⁸Tl	0.076	²³²Th series
15	840.33	839.04	14010	²¹⁴Pb	0.587	²³⁸U series (²²⁶Ra)
		840.38		²²⁸Ac	0.91	²³²Th series
16	860.49	860.56	70207	²⁰⁸Tl	12.5	²³²Th series
17	870.06	870.47	890	²²⁸Ac	0.044	²³²Th series
18	873.89	873.17	1086	²²⁸Ac	0.031	²³²Th series
		874.44		²²⁸Ac	0.047	²³²Th series
19	893.35	893.41	5352	²¹²Bi	0.38	²³²Th series
20	904.08	904.2	9136	²²⁸Ac	0.77	²³²Th series
21	911.12	911.2	399855	²²⁸Ac	25.8	²³²Th series
22	927.88	927.6	615	²⁰⁸Tl	0.125	²³²Th series
23	944.23	944.2	1460	²²⁸Ac	0.095	²³²Th series
24	947.99	947.98	1367	²²⁸Ac	0.106	²³²Th series
25	952.05	952.12	2524	²¹²Bi	0.14	²³²Th series
26	958.58	958.61	4006	²²⁸Ac	0.28	²³²Th series
27	964.77	964.77	71447	²²⁸Ac	4.99	²³²Th series
28	968.97	968.97	235648	²²⁸Ac	15.8	²³²Th series
29	975.92	975.93	1350	²²⁸Ac	0.05	²³²Th series
30	988.09	987.71	2420	²²⁸Ac	0.077	²³²Th series
		988.63		²²⁸Ac	0.077	²³²Th series
31	1001.03	1001.03	2044	^234mPa	0.839	²³⁸U series
32	1033.18	1033.25	2972	²²⁸Ac	0.201	²³²Th series
33	1040.3	1039.65	1605	²²⁸Ac	0.044	²³²Th series
		1041.14		²²⁸Ac	0.044	²³²Th series
34	1062.15	1062.68	1048	²²⁸Ac	0.01	²³²Th series
35	1065.39	1065.18	4585	²²⁸Ac	0.132	²³²Th series
36	1078.77	1078.63	7300	²¹²Bi	0.55	²³²Th series
37	1094.21	1093.9	8847	²⁰⁸Tl	0.43	²³²Th series
38	1095.46	1095.68		²²⁸Ac	0.129	²³²Th series
39	1110.41	1110.6	5863	²²⁸Ac	0.019	²³²Th series
		1110.61		²²⁸Ac	0.285	²³²Th series
40	1120.2	1120.29	4624	²¹⁴Bi	14.907	²³⁸U series (²²⁶Ra)
41	1153.83	1153.52	2089	²²⁸Ac	0.139	²³²Th series
42	1157.24	1157.14	365	²²⁸Ac	0.007	²³²Th series
43	1164.8	1164.62	888	²²⁸Ac	0.065	²³²Th series

This website was created by Dr Gordon Gilmore for the benefit of readers of Practical Gamma-Ray Spectrometry (3rd Edition).

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