Bossew Long Background - 200 - 700 keV

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This spectrum was sent to me by Peter Bossew of the University of Salzburg. It is a collation of a large number of spectra measured over a number of years. This particular spectrum represents a count period of 15,240,200 seconds live time (176 days). Peter has also reported the analysis of a collated spectrum representing 3.3 years-worth of counting over 16 years of operation. (Applied Radiation and Isotopes 62 (2005) 635644)
The analyses presented illustrate some of the more esoteric effects explained in Chapter 13, where detector background is discussed. The decay schemes of 214Bi and 228Ac, in particular are very complex and there is always potential for coincidence summing. Some minor peaks for which identification is, at best, tentative could be sum peaks.

Measured
Energy
(keV)
True
Energy
(keV)
Peak
Counts
NuclideEmission
Probability
(%)
Source of radiation
1205.36205.313805235U5.01Primordial
205.68214Pb0.0114238U series (226Ra)
205.99228Th0.0185232Th series
2209.37209.263327228Ac3.89232Th series
210.62227Th1.22235U series
3215.91214.851174228Ac0.029232Th series
215.99228Th0.226232Th series
216.47214Pb0.01238U series (226Ra)
4235.96235.960227Th12.6235U series
5238.63238.6347778212Pb43.6232Th series
6240.76240.99819220Ra4.12235U series
240.99224Ra4.12232Th series
724224221987214Pb7.268238U series (226Ra)
8256.23256.23218227Th6.8235U series
257.52228Ac0.03232Th series
9257.97258.192427234mPa0.0754238U series
258.87214Pb0.5318238U series (226Ra)
10269.46268.8432214Bi0.0161238U series (226Ra)
269.46223Ra13.7235U series
270.24228Ac3.46232Th series
11270.27271.233427219Ra10.8235U series
12287.98288.08870212Bi0.32232Th series
13295.22295.2243578214Pb18.5238U series (226Ra)
14300.09299.982985227Th2.16235U series
300.09212Pb3.18232Th series
15327.92327.441767b+/b-Ann.0.12232Th series
327.94212Bi0.121232Th series
328228Ac2.95232Th series
16338.35338.287426223Ra2.79235U series
338.32228Ac11.27232Th series
17351.87351.9367397214Pb35.6238U series (226Ra)
18386.95386.77570214Bi0.296238U series (226Ra)
19388.72388.88806214Bi0.393238U series (226Ra)
389.36228Ac0.0103232Th series
204634623022214Pb0.213238U series (226Ra)
463228Ac4.4232Th series
21510.79510.7182839208Tl22.6232Th series
22569.85569.72992207mPb97.87207Pb(n,n')
570.82228Ac0.182232Th series
23583.02583.1914229208Tl85232Th series
583.41228Ac0.111232Th series
24609.14609.3152510214Bi45.49238U series (226Ra)
25662.95661.662860137Cs84.99fission
663.82228Ac0.028232Th series
26675.56674.76565228Ac0.109232Th series
27693.02692.52654228Ac0.0056232Th series
693.3214Bi0.0059238U series (226Ra)

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