Appendix D - Peaks found in Background Spectra - Practical Gamma-Ray Spectrometry

Appendix D - Peaks found in Background Spectra

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Energy	Nuclide	P`g`%	Related peaks	Source of radiation
8.04	CuK`a`	29.3	8.91	fluorescence from shielding
8.91	CuK`b`	4.7	8.04	fluorescence from shielding
22.98	CdK`a`2	24.5	23.17	fluorescence from shielding
23.17	CdK`a`1	46.1	22.98	fluorescence from shielding
25.04	SnK`a`2	24.7	25.27	fluorescence from shielding
25.27	SnK`a`1	45.7	25.04	fluorescence from shielding
26.10	CdK`b`1	7.69	22.98	fluorescence from shielding
26.64	CdK`b`2	1.98	22.98	fluorescence from shielding
28.49	SnK`b`1	7.99	25.27	fluorescence from shielding
29.11	SnK`b`2	2.19	25.27	fluorescence from shielding
46.54	²¹⁰Pb	4.25	none	²³⁸U (²²⁶Ra) series
53.23	²¹⁴Pb	1.06	295.22 (18.50), 351.93 (35.60)	²³⁸U (²²⁶Ra) series
53.44	^73mGe	10.34		⁷²Ge(n,`g`), ⁷⁴Ge(n,2n)
63.28	²³⁴Th	4.8	92.58 (5.58)	²³⁸U series
68.75	^73*Ge			⁷³Ge(n,n') broad asymmetric peak
72.81	PbK`a`2	27.7	74.97 (46.2)	fluorescence, and ²⁰⁸Tl decay
74.82	BiK`a`2	27.7	77.11 (46.2)	^212,214Pb decay
74.97	PbK`a`1	46.2	72.81 (27.7)	fluorescence, and ²⁰⁸Tl decay
77.11	BiK`a`1	46.2	74.82 (27.7)	^212,214Pb decay
79.29	PoK`a`1	46.1		fluorescence, and ^212,214Bi decay
81.23	²³¹Th	0.9		²³⁵U series
84.94	PbK`b`1	10.7	74.97 (46.2)	fluorescence, and ²⁰⁸Tl decay
87.30	PbK`b`2	3.91	74.97 (46.2)	fluorescence, and ²⁰⁸Tl decay
87.35	BiK`b`1	10.7	74.82 (27.7)	^212,214Pb decay
89.78	BiK`b`2	3.93	74.82 (27.7)	^212,214Pb decay
89.96	ThK`a`2	28.1	93.35 (45.4)	²³⁵U and ²²⁸Ac decay
92.58	²³⁴Th	5.58	63.28 (4.8)	²³⁸U series - doublet
93.35	ThK`a`1	45.4	89.96 (28.1)	²³⁵U and ²²⁸Ac decay
105.60	ThK`b`1	10.7	93.35 (45.4)	²³⁵U and ²²⁸Ac decay
109.16	²³⁵U	1.54	185.72 (57.2)	primordial
112.81	²³⁴Th	0.28	63.28 (4.8), 92.58 (5.58)	²³⁸U series
122.32	²²³Ra	1.192	269.49 (13.7)	²³⁵U series
129.06	²²⁸Ac	2.42	911.20 (25.8), 968.97 (15.8)	²³²Th series
139.68	^75mGe	39		⁷⁴⁴Ge(n,`g`), ⁷⁶Ge(n,2n)
143.76	²³⁵U	10.96		primordial
159.7	^77mGe	10.33		⁷⁶Ge(n,`g`)
163.33	²³⁸U	5.08	185.72 (57.2)	primordial
174.95	^71mGe	v. small	198.39 (?100)	⁷⁰Ge(n,`g`) activation (summed out)
185.72	²³⁵U	57.2	143.76 10.96)	primordial
186.21	²²⁶Ra	3.555	none	²³⁸U series
198.39	^71mGe	sum		⁷⁰Ge(n,`g`)
205.31	²³⁵U	5.01	185.72 (57.2)	primordial
209.26	²²⁸Ac	3.89	911.20 (25.8), 968.97 (15.8)	²³²Th series
238.63	²¹²Pb	43.6	300.09 (3.18)	²³²Th series
240.89	²²⁴Ra	4.12		²³²Th series
242.00	²¹⁴Pb	7.268	295.22 (18.50), 351.93 (35.6)	²³⁸U (²²⁶Ra) series
269.49	²²³Ra	13.7	122.32 (1.192)	²³⁵U series
270.24	²²⁸Ac	3.46	911.20 (25.8), 968.97 (15.8)	²³²Th series
277.37	²⁰⁸Tl	2.37	583.19 (30.6), 2614.51 (35.85)	²³²Th series – Note1
278.26	^64*Cu			⁶³Cu(n,`g`), ⁶⁵Cu(n,2n) prompt`g`
295.22	²¹⁴Pb	18.5	351.93 (35.60)	²³⁸U (²²⁶Ra) series
299.98	²²⁷Th	2.16		²³⁵U series
300.07	²³¹Pa	2.47		²³⁵U series
300.09	²¹²Pb	3.18	238.63 (43.6)	²³²Th series
328.00	²²⁸Ac	2.95	911.20 (25.8), 968.97 (15.8)	²³²Th series
336.24	^115mCd/^115mIn	45.9	527.90 (27.5)	Activation of Cd (daughter of ¹¹⁵Cd)
338.28	²²³Ra	2.79		²³⁵U series
338.32	²²⁸Ac	11.27	911.20 (25.8), 968.97 (15.8)	²³²Th series
351.06	²¹¹Bi	12.91		²³⁵U series
351.93	²¹⁴Pb	35.6	295.22 (18.50)	²³⁸U (²²⁶Ra) series
409.46	²²⁸Ac	1.92	911.20 (25.8), 968.97 (15.8)	²³²Th series
416.86	^116mIn	27.7		¹¹⁵In(n,`g`) activation of In metal seal
447.60	⁷Be	10.44	none	cosmic
462.00	²¹⁴Pb	0.213	295.22 (18.50), 351.93 (35.6)	²³⁸U (²²⁶Ra) series
463.00	²²⁸Ac	4.4	911.20 (25.8), 968.97 (15.8)	²³²Th series
510.70	²⁰⁸Tl	6.29	583.19 (30.6), 2614.51 (35.85)	²³²Th series – Note1
511.00	Annihilation			Annihilation radiation (`b`⁺)
527.90	¹¹⁵Cd	27.5	336.2(45.9)	¹¹⁴Cd(n,`g`) activation
558.46	^114*Cd			113Cd(n,`g`) prompt`g`
569.7	^207*Pb	97.87		²⁰⁷Pb(n,n')
570.82	²²⁸Ac	0.182	911.20 (25.8), 968.97 (15.8)	²³²Th series
579.20	^207*Pb			²⁰⁷Pb(n,n') prompt`g`
583.19	²⁰⁸Tl	30.6	2614.51 (35.85)	²³²Th series – Note1
595.85	^74*Ge			⁷⁴Ge(n,n') broad asymmetric peak
609.31	²¹⁴Bi	45.49	1120.29 (14.907), 1764.49 (15.28)	²³⁸U (²²⁶Ra) series
661.66	137Cs	84.99	none	fission
669.62	^63*Cu			⁶³Cu(n,n') prompt`g`
689.6	^72*Ge			⁷²Ge(n,n') broad asymmetric peak
726.86	²²⁸Ac	0.62	911.20 (25.8), 968.97 (15.8)	²³²Th series
727.33	²¹²Bi	6.74	1620.74 (1.51)	²³²Th series
755.31	²²⁸Ac	1	911.20 (25.8), 968.97 (15.8)	²³²Th series
768.36	²¹⁴Bi	4.891	609.31 (45.49), 1764.49 (15.28)	²³⁸U (²²⁶Ra) series
794.95	²²⁸Ac	4.25	911.20 (25.8), 968.97 (15.8)	²³²Th series
803.06	^206*Pb			²⁰⁶Pb(n,n’) prompt`g`
806.17	²¹⁴Bi	1.262	609.31 (45.49), 1764.49 (15.28)	²³⁸U (²²⁶Ra) series
832.01	²¹¹Pb	3.52		²³⁵U series
835.71	²²⁸Ac	1.61	911.20 (25.8), 968.97 (15.8)	²³²Th series
839.04	²¹⁴Pb	0.587	295.22 (18.50), 351.93 (35.6)	²³⁸U (²²⁶Ra) series
843.76	²⁷Mg	71.8		²⁶Mg(n,`g`) or ²⁷Al(n,p) of encapsulation
846.77	^56*Fe			⁵⁶Fe(n,n')
860.56	²⁰⁸Tl	4.48	583.19 (30.6), 2614.51 (35.85)	²³²Th series – Note1
911.20	²²⁸Ac	25.8	968.97 (15.8)	²³²Th series
934.06	²¹⁴Bi	3.096	609.31 (45.49), 1764.49 (15.28)	²³⁸U (²²⁶Ra) series
962.06	^63*Cu			⁶³Cu(n,n') prompt`g`
964.77	²²⁸Ac	4.99	911.20 (25.8), 968.97 (15.8)	²³²Th series
968.97	²²⁸Ac	15.8	911.20 (25.8)	²³²Th series
1001.03	^234mPa	1.021		²³⁸U series (GRG empirical P`g`)
1014.44	²⁷Mg	28		²⁶Mg(n,`g`) or ²⁷Al(n,p ) of encapsulation
1063.66	^207*Pb	88.5		^207*Pb(n,n')
1097.3	^ll6In	56.2	1293.54 (84.4)	¹¹⁵In(n,`g`) activation of In metal seal
1115.56	^65*Cu			⁶⁵Cu(n,n')
1120.29	²¹⁴Bi	14.907	609.31 (45.49), 1764.49 (15.28)	²³⁸U (²²⁶Ra) series
1155.19	²¹⁴Bi	1.635	609.31 (45.49), 1764.49 (15.28)	²³⁸U (²²⁶Ra) series
1173.23	⁶⁰Co	99.85	1332.49 (99.98)	activation
1238.11	²¹⁴Bi	5.827	609.31 (45.49), 1764.49 (15.28)	²³⁸U (²²⁶Ra) series
1293.54	¹¹⁶In	84.4	1097.3 (56.2)	¹¹⁵In(n,`g`) activation of In metal seal
1332.49	⁶⁰Co	99.98	1173.23 (99.85)	activation
1377.67	²¹⁴Bi	3.967	609.31 (45.49), 1764.49 (15.28)	²³⁸U (²²⁶Ra) series
1407.98	²¹⁴Bi	2.389	609.31 (45.49), 1764.49 (15.28)	²³⁸U (²²⁶Ra) series
1459.14	²²⁸Ac	0.83	911.20 (25.8), 968.97 (15.8)	²³²Th series
1460.82	⁴⁰K	10.66	none	primordial
1588.2	²²⁸Ac	3.22	911.20 (25.8), 968.97 (15.8)	²³²Th series
1620.74	²¹²Bi	1.51	727.33 (6.74)	²³²Th series
1630.63	²²⁸Ac	1.51	911.20 (25.8), 968.97 (15.8)	²³²Th series
1729.60	²¹⁴Bi	2.843	609.31 (45.49), 1764.49 (15.28)	²³⁸U (²²⁶Ra) series
1764.49	²¹⁴Bi	15.28	609.31 (45.49), 1764.49 (15.28)	²³⁸U(²²⁶Ra) series
1847.42	²¹⁴Bi	2.023	609.31 (45.49), 1764.49 (15.28)	²³⁸U (²²⁶Ra) series
2204.21	²¹⁴Bi	4.913	609.31 (45.49), 1764.49 (15.28)	²³⁸U (²²⁶Ra) series
2224.57	^2*H			¹H(n,`g`)
2614.51	²⁰⁸Tl	35.85	583.19 (30.6)	²³²Th series; ²⁰⁸Pb(n,p) – Note1

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