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
NuclideEmission
Probability
(%)
Source of radiation
1203.99204.034230228Ac0.112232Th series
2209.26209.26169637228Ac3.89232Th series
3211.59211.42096208Tl0.18232Th series
4215.95214.8513043228Ac0.029232Th series
215.99228Th0.226232Th series
5233.39233.33447208Tl0.31232Th series
6238.63238.631914700212Pb43.6232Th series
7240.76240.99163296224Ra4.12232Th series
824224230392214Pb7.268238U series (226Ra)
9252.58252.58550208Tl0.78232Th series
10256.23257.5225228Ac0.03232Th series
11263.58263.582233228Ac0.04232Th series
12270.27270.24119094228Ac3.46232Th series
13277.4277.3782045208Tl6.6232Th series
14278.96278.95228Ac0.191232Th series
15282.212822203228Ac0.072232Th series
16288.02288.0812428212Bi0.32232Th series
17295.11295.2216974214Pb18.5238U series (226Ra)
18300.01300.09107883212Pb3.18232Th series
19321.5321.656818228Ac0.226232Th series
20327.86327.4496039228Ac0.12232Th series
327.94212Bi0.121232Th series
328228Ac2.95232Th series
21332.22332.3711947228Ac0.4232Th series
22338.32338.32368809228Ac11.27232Th series
23340.86340.9611454228Ac0.369232Th series
24351.93351.9328799214Pb35.6238U series (226Ra)
25377.09377.993634228Ac0.025232Th series
26409.35409.4651367228Ac1.92232Th series
27415.46415.271998b+/b-Ann.0.144232Th series
416.3228Ac0.0132232Th series
28440.38440.443150228Ac0.121232Th series
29452.79452.479895228Ac0.015232Th series
452.8212Bi0.34232Th series
30462.95463103717228Ac4.4232Th series
31478.21478.334145228Ac0.209232Th series
32503.8503.823702228Ac0.182232Th series
33510.61510.7185510208Tl22.6232Th series
34519.96520.15228Ac0.067232Th series
35523.3523.132524228Ac0.103232Th series
36546.3546.473641228Ac0.201232Th series
37549.69548.893222228Ac0.023232Th series
549.76220Rn0.115232Th series
38562.46562.518599228Ac0.87232Th series
39570.64570.823326228Ac0.182232Th series
40572.42572.142934228Ac0.15232Th series
41583.15583.19581873208Tl85232Th series
583.41228Ac0.111232Th series
42609.29609.3122603214Bi45.49238U series (226Ra)
610.58228Ac0.023232Th series
43616.01616.221532228Ac0.08232Th series
44620.31620.381570228Ac0.08232Th series
45640.44640.341142228Ac0.054232Th series
46651.18650.21522208Tl0.05232Th series
651.51228Ac0.09232Th series
47674.65674.16998228Ac0.109232Th series
674.76228Ac0.109232Th series

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