200,000 second background - 1200 to 2000 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.

Measured
Energy
(keV)
True
Energy
(keV)
Peak
Counts
NuclideEmission
Probability
(%)
Source of radiation
11238.841238.11664214Bi5.827238U series (226Ra)
21459.711459.140228Ac0.83232Th series
31461.411460.82546440K10.66Primordial
41588.51588.2228Ac3.22232Th series
51593.011593.7181234mPa0.00384238U series
61621.231620.74145212Bi1.51232Th series
71730.191729.6295214Bi2.843238U series (226Ra)
81764.51764.4911214Bi15.28238U series (226Ra)
91765.211765.41400234mPa0.0087238U series
101847.861847.42199214Bi2.023238U series (226Ra)

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