200,000 second background - 0 - 200 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
112.6812.568407212Pb14.5232Th series
12.75228Ra0.3232Th series
12.89214Pb12.42238U series (226Ra)
12.9210Pb23.2238U series (226Ra)
12.94212Bi0.0581232Th series
12.94214Bi0.627238U series (226Ra)
215.9815.7513211235U51Primordial
15.75228Ac32.9232Th series
16.2228Ra0.7232Th series
319.1420.022876234Th0.009238U series
20.25227Th0.23235U series
424.0824.13735227Th0.086235U series
525.6225.27743??45.7Unidentified
646.546.543068210Pb4.25238U series (226Ra)
749.4349.55186238U0.0697Primordial
853.1153.23751214Pb1.06238U series (226Ra)
53.4473mGe10.3472Ge(n,g), 74Ge(n,2n)
963.3263.286667234Th4.8238U series
1072.8272.81410208Tl2.15232Th series
72.87212Bi0.095232Th series
1174.9274.825980214Pb6.26238U series (226Ra)
74.82212Pb10.7232Th series
74.97208Tl3.61232Th series
1277.1876.866704212Bi0.0404232Th series
76.86214Bi0.426238U series (226Ra)
77.11214Pb10.47238U series (226Ra)
77.11212Pb17.9232Th series
77.34228Ac0.026232Th series
1379.4379.29372214Bi0.709238U series (226Ra)
79.29219Ra0.89235U series
79.29212Bi0.0672232Th series
79.69227Th1.9235U series
1481.2981.07296223Ra15235U series
81.07224Ra0.13232Th series
81.07226Ra0.192238U series (226Ra)
81.07228Ra1.76232Th series
1584.584.372088228Th1.17232Th series
84.95208Tl1.23232Th series
1687.3587.022330234Th0.018238U series
87.35214Pb3.59238U series (226Ra)
87.35212Pb6.12232Th series
87.58208Tl0.373232Th series
1789.9689.751146212Bi0.0231232Th series
89.95214Bi0.244238U series (226Ra)
89.95235U3.56Primordial
89.95228Ac0.931232Th series
90.08214Pb1.1238U series (226Ra)
90.14212Pb1.87232Th series
1892.5992.378763234Th2.81238U series
92.64214Bi0.076238U series (226Ra)
92.68212Bi0.0072232Th series
92.79234Th2.77238U series
1998.8898.44766234mPa0.233238U series
20105.75105.55235U2.08Primordial
105.55228Ac0.536232Th series
21112.87112.81634234Th0.28238U series
22129.15129.06653228Ac2.42232Th series
23143.95143.76785235U10.96Primordial
143.87230Th0.049238U series
144.23223Ra3.22235U series
24163.6163.33557235U5.08Primordial
25185.93185.725163235U57.2Primordial
186.05230Th0.0088238U series
186.21226Ra3.555238U series (226Ra)
26198.66198.3947671mGe170Ge(n,g activation (summed)

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