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
NuclideEmission
Probability
(%)
Source of radiation
146.5546.5429396210Pb4.25238U series (226Ra)
249.7749.555274238U0.0697Primordial
50.13227Th8.2235U series
352.8153.2316285214Pb1.06238U series (226Ra)
463.2862.5111846214Bi0.0116238U series (226Ra)
63.28234Th4.8238U series
567.3467.6713247230Th0.376238U series
674.5673.92262132234Th0.017238U series
73.92234mPa0.17238U series
74.82212Pb10.7232Th series
74.82214Pb6.26238U series (226Ra)
776.976.86475826214Bi0.426238U series (226Ra)
77.11212Pb17.9232Th series
77.11214Pb10.47238U series (226Ra)
879.179.2940554214Bi0.709238U series (226Ra)
79.29219Ra0.89235U series
79.69227Th1.9235U series
980.9881.0734285223Ra15235U series
81.07226Ra0.192238U series (226Ra)
1083.6983.382876234Th0.074238U series
83.78223Ra25235U series
83.78226Ra0.317238U series (226Ra)
118787.02172846234Th0.018238U series
87.35212Pb6.12232Th series
87.35214Pb3.59238U series (226Ra)
1289.7288.4778028230Th0.007238U series
88.47227Th2.96235U series
89.95214Bi0.244238U series (226Ra)
89.95235U3.56Primordial
90.08214Pb1.1238U series (226Ra)
1392.5892.37281027234Th2.81238U series
92.64214Bi0.076238U series (226Ra)
92.79234Th2.77238U series
93.35235U5.81Primordial
93.88227Th1.48235U series
1494.6394.6735995234mPa0.143238U series
94.85223Ra8.7235U series
94.85226Ra0.1098238U series (226Ra)
1598.2597.920979223Ra2.8235U series
97.9226Ra0.0351238U series (226Ra)
98.44234mPa0.233238U series
16105.511051432234mPa0.0114238U series
105.55235U2.08Primordial
17108.821083618234Th0.01238U series
108.97235U0.7Primordial
109.16235U1.54Primordial
18111.03111.235909234mPa0.08238U series
19112.88112.8117758234Th0.28238U series
113.5238U0.0174Primordial
20121.69122.326919223Ra1.192235U series
21143.93143.7648872235U10.96Primordial
143.87230Th0.049238U series
144.23223Ra3.22235U series
22154.26154.2121763223Ra5.62235U series
23163.52163.3316461235U5.08Primordial
24186.16185.72404763235U57.2Primordial
186.05230Th0.0088238U series
186.21226Ra3.555238U series (226Ra)
25196.01196.24415214Pb0.069238U series (226Ra)

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