Bossew Long Background - 1200 - 2000 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
11238.181238.115152214Bi5.827238U series (226Ra)
21377.531377.672838214Bi3.967238U series (226Ra)
1378.23228Ac0.0059232Th series
31408.311407.981911214Bi2.389238U series (226Ra)
41415.651415.88364228Ac0.021232Th series
51459.191459.147272228Ac0.83232Th series
61460.821460.823953740K10.66Primordial
71479.451479.15381214Bi0.0514238U series (226Ra)
1480.37228Ac0.016232Th series
81509.331509.232631214Bi2.126238U series (226Ra)
1510.5234mPa0.013238U series

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