IAEA RGU-1 Reference Material - 0 - 200 keV- Practical Gamma-Ray Spectrometry

IAEA RGU-1 Reference Material - 0 - 200 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 RGU-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 negligible thorium in this material, but the spectrum is likely to contain peaks from the ²³²Th decay series from 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	46.55	46.54	29396	²¹⁰Pb	4.25	²³⁸U series (²²⁶Ra)
2	49.77	49.55	5274	²³⁸U	0.0697	Primordial
		50.13		²²⁷Th	8.2	²³⁵U series
3	52.81	53.23	16285	²¹⁴Pb	1.06	²³⁸U series (²²⁶Ra)
4	63.28	62.5	111846	²¹⁴Bi	0.0116	²³⁸U series (²²⁶Ra)
		63.28		²³⁴Th	4.8	²³⁸U series
5	67.34	67.67	13247	²³⁰Th	0.376	²³⁸U series
6	74.56	73.92	262132	²³⁴Th	0.017	²³⁸U series
		73.92		^234mPa	0.17	²³⁸U series
		74.82		²¹²Pb	10.7	²³²Th series
		74.82		²¹⁴Pb	6.26	²³⁸U series (²²⁶Ra)
7	76.9	76.86	475826	²¹⁴Bi	0.426	²³⁸U series (²²⁶Ra)
		77.11		²¹²Pb	17.9	²³²Th series
		77.11		²¹⁴Pb	10.47	²³⁸U series (²²⁶Ra)
8	79.1	79.29	40554	²¹⁴Bi	0.709	²³⁸U series (²²⁶Ra)
		79.29		²¹⁹Ra	0.89	²³⁵U series
		79.69		²²⁷Th	1.9	²³⁵U series
9	80.98	81.07	34285	²²³Ra	15	²³⁵U series
		81.07		²²⁶Ra	0.192	²³⁸U series (²²⁶Ra)
10	83.69	83.3	82876	²³⁴Th	0.074	²³⁸U series
		83.78		²²³Ra	25	²³⁵U series
		83.78		²²⁶Ra	0.317	²³⁸U series (²²⁶Ra)
11	87	87.02	172846	²³⁴Th	0.018	²³⁸U series
		87.35		²¹²Pb	6.12	²³²Th series
		87.35		²¹⁴Pb	3.59	²³⁸U series (²²⁶Ra)
12	89.72	88.47	78028	²³⁰Th	0.007	²³⁸U series
		88.47		²²⁷Th	2.96	²³⁵U series
		89.95		²¹⁴Bi	0.244	²³⁸U series (²²⁶Ra)
		89.95		²³⁵U	3.56	Primordial
		90.08		²¹⁴Pb	1.1	²³⁸U series (²²⁶Ra)
13	92.58	92.37	281027	²³⁴Th	2.81	²³⁸U series
		92.64		²¹⁴Bi	0.076	²³⁸U series (²²⁶Ra)
		92.79		²³⁴Th	2.77	²³⁸U series
		93.35		²³⁵U	5.81	Primordial
		93.88		²²⁷Th	1.48	²³⁵U series
14	94.63	94.67	35995	^234mPa	0.143	²³⁸U series
		94.85		²²³Ra	8.7	²³⁵U series
		94.85		²²⁶Ra	0.1098	²³⁸U series (²²⁶Ra)
15	98.25	97.9	20979	²²³Ra	2.8	²³⁵U series
		97.9		²²⁶Ra	0.0351	²³⁸U series (²²⁶Ra)
		98.44		^234mPa	0.233	²³⁸U series
16	105.51	105	1432	^234mPa	0.0114	²³⁸U series
		105.55		²³⁵U	2.08	Primordial
17	108.82	108	3618	²³⁴Th	0.01	²³⁸U series
		108.97		²³⁵U	0.7	Primordial
		109.16		²³⁵U	1.54	Primordial
18	111.03	111.23	5909	^234mPa	0.08	²³⁸U series
19	112.88	112.81	17758	²³⁴Th	0.28	²³⁸U series
		113.5		²³⁸U	0.0174	Primordial
20	121.69	122.32	6919	²²³Ra	1.192	²³⁵U series
21	143.93	143.76	48872	²³⁵U	10.96	Primordial
		143.87		²³⁰Th	0.049	²³⁸U series
		144.23		²²³Ra	3.22	²³⁵U series
22	154.26	154.21	21763	²²³Ra	5.62	²³⁵U series
23	163.52	163.33	16461	²³⁵U	5.08	Primordial
24	186.16	185.72	404763	²³⁵U	57.2	Primordial
		186.05		²³⁰Th	0.0088	²³⁸U series
		186.21		²²⁶Ra	3.555	²³⁸U series (²²⁶Ra)
25	196.01	196.2	4415	²¹⁴Pb	0.069	²³⁸U series (²²⁶Ra)

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

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