Investigation of vacuum melting technique for low background titanium

Tao ZHANG; Ke HAN; Jianglai LIU; Yue MENG; Yukun YAO; Siguang WANG; Bobo LI; Yinqi LIU; Teng PEI

doi:10.11889/j.0253-3219.2022.hjs.45.110201

Journals >NUCLEAR TECHNIQUES >Volume 45 >Issue 11 >Page 110201 > Article

NUCLEAR TECHNIQUES
Vol. 45, Issue 11, 110201 (2022)

Investigation of vacuum melting technique for low background titanium

Tao ZHANG^1、2, Ke HAN^1、2, Jianglai LIU^1、2, Yue MENG^1、2、*, Yukun YAO¹, Siguang WANG³, Bobo LI⁴, Yinqi LIU⁴, and Teng PEI⁴

Author Affiliations

¹Sichuan Research Institute, Shanghai Jiao Tong University, Chengdu 610213, China

²School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China

³School of Physics, State Key Laboratory of Nuclear Physics and Technology and Center for High Energy Physics, Peking University, Beijing 100871, China

⁴Luoyang Shuangrui Titanium Precision Casting Co. , Ltd. , Luoyang 471000, China

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DOI: 10.11889/j.0253-3219.2022.hjs.45.110201 Cite this Article

Tao ZHANG, Ke HAN, Jianglai LIU, Yue MENG, Yukun YAO, Siguang WANG, Bobo LI, Yinqi LIU, Teng PEI. Investigation of vacuum melting technique for low background titanium[J]. NUCLEAR TECHNIQUES, 2022, 45(11): 110201 Copy Citation Text

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Fig. 1. Abbreviated decay chain of ²³⁸U

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Fig. 2. Abbreviated decay chain of ²³²Th

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Fig. 3. Relative activity trend after complete ²²⁸Ra removal from the decay chain of ²³²Th

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样品编号Sample	⁶⁰Co	¹³⁷Cs	⁴⁰K	²³²Th-²²⁸Ac	²³²Th-²²⁸Th	²³⁸U-²²⁶Ra	²³⁸U-²²²Rn	²³⁵U
VARA	0±60	0±48	12 959±1 302	3 594±284	3 411±177	4 324±1 267	2 482±153	66±132
	<98	<79						<282
VARB	0.02±3.53	2.2±3.8	196±63	35±14	196±13	316±128	5.8±5.2	2.7±10.6
	<5.81	<8.4		<58		<526	<14	<20
P4TP	0.04±1.17	0±1.32	3.60±13.6	1.77±3.49	0.55±1.33	0±15.1	4.64±2.07	0.03±2.1
	<1.96	<2.16	<25.9	<7.49	<2.73	<27.8	<8.03	<3.47
VARC	0±0.75	0±0.79	1.67±7.35	2.59±1.75	7.44±1.67	87±27	2.17±1.41	3.59±2.75
	<1.23	<1.20	<12.1	<5.46			<4.48	<8.10
VARD	0.54±1.66	0±1.96	67±25	1.03±5.15	5.13±3.20	167±53	2.06±2.57	0.00±3.00
	<3.26	<3.21	<108	<5.30	<10.4		<6.27	<4.92
VARF	0.08±1.29	1.23±1.37	1.3±15	0.62±3.98	3.19±2.76	0±20	2.46±2.42	0±19
	<2.12	<3.48	<25.9	<7.15	<7.72	<32.8	<6.43	<31.2
VARH	0±2.02	0±2.59	0±22	5.8±6.3	0.47±3.57	0±31	4.22±3.0	0±26
	<3.31	<4.25	<36	<16.1	<6.32	<51	<9.14	<43
VARI	0±1.34	0.67±1.2	3.6±16	2.4±3.78	1.55±2.15	0±17	1.39±1.73	0±13
	<2.20	<2.64	<29.8	<8.6	<5.08	<28	<4.23	<21
VARJ	0.29±1.46	0±1.87	17.6±17.3	4.48±4.05	0.37±1.69	0±23	3.13±2.33	0±17
	<2.68	<3.07	<46.0	<11.1	<3.14	<38	<6.95	<28

Table 1. Radioactive background of the sample from vacuum consumable electrode arc furnace (mBq∙kg^-¹)

样品编号Sample	⁶⁰Co	¹³⁷Cs	⁴⁰K	²³²Th-²²⁸Ac	²³²Th-²²⁸Th	²³⁸U-²²⁶Ra	²³⁸U-²²²Rn	²³⁵U
T4	0.00±2.15	0.00±2.05	31.6±24.5	3.00±4.88	0.32±1.78	14.3±35.7	0.37±2.12	0.83±4.28
	<3.53	<3.36	<71.8	<11.0	<3.24	<72.8	<3.85	<7.85
T5	1.48±2.04	0.00±2.23	47.2±26.8	0.00±5.89	4.46±3.34	0.00±18.6	0.14±2.40	15.8±5.15
	<4.83	<3.66	<91.2	<9.66	<9.94	<30.5	<4.08
T8	0.00±0.77	0.37±0.77	0.00±7.52	0.00±2.24	1.22±1.46	0.00±14.0	1.93±1.28	18.1±27.9
	<1.26	<1.63	<12.3	<3.67	<3.61	<23.0	<4.03	<63.9
T9	0.00±1.29	0.04±1.12	0.00±7.07	0.34±1.95	0.19±0.56	5.58±4.15	0.17±0.68	0.00±1.32
	<2.12	<1.88	<11.6	<3.54	<1.11	<12.4	<1.29	<2.16
T10	0.00±0.24	0.00±0.29	0.03±0.26	0.13±0.69	2.52±0.50	8.73±5.46	0.07±0.29	0.00±3.57
	<0.39	<0.48	<0.46	<1.26		<17.7	<0.55	<5.85
ST11	0.00±2.60	1.17±1.80	3.59±17.5	3.23±5.31	4.67±3.49	52.0±23.2	23.1±3.69	0.00±21.0
	<4.26	<4.12	<32.3	<11.9	<10.4	<90.0		<34.4
T13	0.00±0.09	0.20±0.13	1.96±1.86	0.42±0.37	1.40±0.30	20.1±5.30	0.05±0.14	0.37±0.57
	<0.15	<0.41	<5.01	<1.03			<0.28	<1.30
ST14	0.00±0.22	0.00±0.26	0.00±2.04	1.24±0.61	0.00±0.23	9.06±6.20	0.28±0.31	3.33±4.57
	<0.36	<0.43	<3.35	<2.24	<0.38	<19.2	<0.79	<10.8
T23	0.09±0.06	0.00±0.05	0.00±0.84	0.04±0.22	0.89±0.24	18.4±3.9	0.29±0.18	0.01±0.16
	<0.19	<0.08	<1.38	<0.40			<0.59	<0.27
T26	0.00±0.09	0.00±0.08	0.00±1.13	0.16±0.32	1.03±0.32	20.6±4.83	0.14±0.16	1.57±0.65
	<0.15	<0.13	<1.85	<0.78			<0.40	<2.64

Table 2. Titanium sponge and electron beam melting plate background (mBq∙kg^-¹)

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