IAEA RGTh-1 Reference Material - 1200 - 2100 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
NuclideEmission
Probability
(%)
Source of radiation
112381238.111935214Bi5.827238U series (226Ra)
21244.831245.056774228Ac0.095232Th series
31246.841247.08228Ac0.5232Th series
41373.991374.191378228Ac0.014232Th series
51407.881407.98793214Bi2.389238U series (226Ra)
61431.551430.95228Ac0.035232Th series
71459.191459.148661228Ac0.83232Th series
81460.821460.82499840K10.66Primordial
91495.741495.9110055228Ac0.86232Th series
101501.551501.575144228Ac0.46232Th series
111509.151509.23214Bi2.126238U series (226Ra)
121512.351512.74827212Bi0.29232Th series
131557.251557.062143228Ac0.178232Th series
141580.321580.536597228Ac0.6232Th series
151588.091588.233688228Ac3.22232Th series
161620.741620.7415840212Bi1.51232Th series
171625.051625.063115228Ac0.255232Th series
181630.551630.6316905228Ac1.51232Th series
191638.211638.284674228Ac0.47232Th series
201666.821666.522029228Ac0.178232Th series
211678.971677.68228Ac0.054232Th series
1679.45212Bi0.07232Th series
221685.761686.121039228Ac0.095232Th series
231729.361729.6214Bi2.843238U series (226Ra)
241764.461764.494300214Bi15.28238U series (226Ra)
251806.021805.961247212Bi0.12232Th series
261822.871823.28655228Ac0.044232Th series

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