Bossew Long Background - 0 - 200 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
146.646.5446585210Pb4.25238U series (226Ra)
253.3753.237265214Pb1.06238U series (226Ra)
53.4473mGe10.3472Ge(n,g), 74Ge(n,2n)
363.2862.547299214Bi0.0116238U series (226Ra)
63.28234Th4.8238U series
63.81232Th0.27Primordial
466.4367.674774230Th0.376238U series
569.2868.75461773*Ge173Ge(n,n') broad asymmetric peak
672.9272.835390208Tl2.15232Th series
72.87212Bi0.095232Th series
73.92234Th0.017238U series
73.92234mPa0.17238U series
775.0174.8287522214Pb6.26238U series (226Ra)
74.82212Pb10.7232Th series
74.97208Tl3.61232Th series
877.1976.8642796212Bi0.0404232Th series
76.86214Bi0.426238U series (226Ra)
77.11214Pb10.47238U series (226Ra)
77.11212Pb17.9232Th series
77.34228Ac0.026232Th series
981.1681.074676223Ra15235U series
81.07224Ra0.13232Th series
81.07226Ra0.192238U series (226Ra)
81.07228Ra1.76232Th series
1084.7383.7856086223Ra25235U series
83.78224Ra0.215232Th series
83.78226Ra0.317238U series (226Ra)
83.78228Ra2.9232Th series
84.37228Th1.17232Th series
84.95208Tl1.23232Th series
85.14212Bi0.0096232Th series
85.43227Th1.81235U series
85.43228Th0.0172232Th series
1187.4187.0231730234Th0.018238U series
87.35214Pb3.59238U series (226Ra)
87.35212Pb6.12232Th series
87.58208Tl0.373232Th series
88.47230Th0.007238U series
88.47227Th2.96235U series
88.47228Th0.0281232Th series
129089.758262212Bi0.0231232Th series
89.95214Bi0.244238U series (226Ra)
89.95235U3.56Primordial
89.95228Ac0.931232Th series
90.08214Pb1.1238U series (226Ra)
90.14212Pb1.87232Th series
1392.5892.37102471234Th2.81238U series
92.64214Bi0.076238U series (226Ra)
92.68212Bi0.0072232Th series
92.79234Th2.77238U series
93.35235U5.81Primordial
93.35228Ac1.507232Th series
93.88227Th1.48235U series
1498.7897.98523223Ra2.8235U series
97.9224Ra0.0238232Th series
97.9226Ra0.0351238U series (226Ra)
98.44234mPa0.233238U series
99.51228Ac1.26232Th series
15105.581051358234mPa0.0114238U series
105.55235U2.08Primordial
105.55228Ac0.536232Th series
16109.241082470234Th0.01238U series
108.97235U0.7Primordial
108.97228Ac0.181232Th series
109.16235U1.54Primordial
17112.75112.816167234Th0.28238U series
113.5238U0.0174Primordial
18122.09122.323153223Ra1.192235U series
19129.21129.062248228Ac2.42232Th series
20139.88139.68349675mGe3974Ge(n,g), 76Ge(n,2n)
140.88232Th0.022Primordial
141.01228Ac0.05232Th series
21143.76143.7613571235U10.96Primordial
143.87230Th0.049238U series
144.23223Ra3.22235U series
22159.28159.7134777mGe10.3376Ge(n,g)
23163.33163.336310235U5.08Primordial
24186.21185.7263838235U57.2Primordial
186.05230Th0.0088238U series
186.21226Ra3.555238U series (226Ra)
25198.34198.39445971mGe170Ge(n,g activation (summed)
199.41228Ac0.315232Th series

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