IAEA RGTh-1 Reference Material - 200 - 700 keV -Practical Gamma-Ray Spectrometry

IAEA RGTh-1 Reference Material - 200 - 700 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	203.99	204.03	4230	²²⁸Ac	0.112	²³²Th series
2	209.26	209.26	169637	²²⁸Ac	3.89	²³²Th series
3	211.59	211.4	2096	²⁰⁸Tl	0.18	²³²Th series
4	215.95	214.85	13043	²²⁸Ac	0.029	²³²Th series
		215.99		²²⁸Th	0.226	²³²Th series
5	233.39	233.3	3447	²⁰⁸Tl	0.31	²³²Th series
6	238.63	238.63	1914700	²¹²Pb	43.6	²³²Th series
7	240.76	240.99	163296	²²⁴Ra	4.12	²³²Th series
8	242	242	30392	²¹⁴Pb	7.268	²³⁸U series (²²⁶Ra)
9	252.58	252.5	8550	²⁰⁸Tl	0.78	²³²Th series
10	256.23	257.52	25	²²⁸Ac	0.03	²³²Th series
11	263.58	263.58	2233	²²⁸Ac	0.04	²³²Th series
12	270.27	270.24	119094	²²⁸Ac	3.46	²³²Th series
13	277.4	277.37	82045	²⁰⁸Tl	6.6	²³²Th series
14	278.96	278.95		²²⁸Ac	0.191	²³²Th series
15	282.21	282	2203	²²⁸Ac	0.072	²³²Th series
16	288.02	288.08	12428	²¹²Bi	0.32	²³²Th series
17	295.11	295.22	16974	²¹⁴Pb	18.5	²³⁸U series (²²⁶Ra)
18	300.01	300.09	107883	²¹²Pb	3.18	²³²Th series
19	321.5	321.65	6818	²²⁸Ac	0.226	²³²Th series
20	327.86	327.44	96039	²²⁸Ac	0.12	²³²Th series
		327.94		²¹²Bi	0.121	²³²Th series
		328		²²⁸Ac	2.95	²³²Th series
21	332.22	332.37	11947	²²⁸Ac	0.4	²³²Th series
22	338.32	338.32	368809	²²⁸Ac	11.27	²³²Th series
23	340.86	340.96	11454	²²⁸Ac	0.369	²³²Th series
24	351.93	351.93	28799	²¹⁴Pb	35.6	²³⁸U series (²²⁶Ra)
25	377.09	377.99	3634	²²⁸Ac	0.025	²³²Th series
26	409.35	409.46	51367	²²⁸Ac	1.92	²³²Th series
27	415.46	415.27	1998	^b+/b-Ann.	0.144	²³²Th series
		416.3		²²⁸Ac	0.0132	²³²Th series
28	440.38	440.44	3150	²²⁸Ac	0.121	²³²Th series
29	452.79	452.47	9895	²²⁸Ac	0.015	²³²Th series
		452.8		²¹²Bi	0.34	²³²Th series
30	462.95	463	103717	²²⁸Ac	4.4	²³²Th series
31	478.21	478.33	4145	²²⁸Ac	0.209	²³²Th series
32	503.8	503.82	3702	²²⁸Ac	0.182	²³²Th series
33	510.61	510.7	185510	²⁰⁸Tl	22.6	²³²Th series
34	519.96	520.15		²²⁸Ac	0.067	²³²Th series
35	523.3	523.13	2524	²²⁸Ac	0.103	²³²Th series
36	546.3	546.47	3641	²²⁸Ac	0.201	²³²Th series
37	549.69	548.89	3222	²²⁸Ac	0.023	²³²Th series
		549.76		²²⁰Rn	0.115	²³²Th series
38	562.46	562.5	18599	²²⁸Ac	0.87	²³²Th series
39	570.64	570.82	3326	²²⁸Ac	0.182	²³²Th series
40	572.42	572.14	2934	²²⁸Ac	0.15	²³²Th series
41	583.15	583.19	581873	²⁰⁸Tl	85	²³²Th series
		583.41		²²⁸Ac	0.111	²³²Th series
42	609.29	609.31	22603	²¹⁴Bi	45.49	²³⁸U series (²²⁶Ra)
		610.58		²²⁸Ac	0.023	²³²Th series
43	616.01	616.22	1532	²²⁸Ac	0.08	²³²Th series
44	620.31	620.38	1570	²²⁸Ac	0.08	²³²Th series
45	640.44	640.34	1142	²²⁸Ac	0.054	²³²Th series
46	651.18	650.2	1522	²⁰⁸Tl	0.05	²³²Th series
		651.51		²²⁸Ac	0.09	²³²Th series
47	674.65	674.16	998	²²⁸Ac	0.109	²³²Th series
		674.76		²²⁸Ac	0.109	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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