Study on the method of air absorbed dose rate measurement by NaI(Tl) detector

Xuejian WANG; Guobing YU; Jianyou GUO; Feng XU; Xianbao GU; Yang PANG

doi:10.11889/j.1000-3436.2023-0026

Journals >Journal of Radiation Research and Radiation Processing >Volume 41 >Issue 5 >Page 050701 > Article

Journal of Radiation Research and Radiation Processing
Vol. 41, Issue 5, 050701 (2023)

Study on the method of air absorbed dose rate measurement by NaI(Tl) detector

Xuejian WANG¹, Guobing YU², Jianyou GUO^1,*, Feng XU^3,**..., Xianbao GU² and Yang PANG^3,4|Show fewer author(s)

Author Affiliations

¹School of Physics and Optoelectronic Engineering, Anhui University, Hefei 230601, China

²Radiation Environment Supervision Station, Anhui Provincial Department of Ecology and Environment, Hefei 230071, China

³School of Nuclear Science and Technology, Harbin Engineering University, Harbin 150001, China

⁴Institute of Atomic Energy, Heilongjiang Province, Harbin 150081, China

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DOI: 10.11889/j.1000-3436.2023-0026 Cite this Article

Xuejian WANG, Guobing YU, Jianyou GUO, Feng XU, Xianbao GU, Yang PANG. Study on the method of air absorbed dose rate measurement by NaI(Tl) detector[J]. Journal of Radiation Research and Radiation Processing, 2023, 41(5): 050701 Copy Citation Text

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Fig. 1. NaI(Tl) detector FLUKA simulation diagram

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Fig. 2. NaI(Tl) detector half height and width fitting curve

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Fig. 3. FLUKA simulated energy spectra of γ-rays at different energies (color online)

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Fig. 4. G(E) function curves with different K_max values

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Fig. 5. Optimization factor M is different from the G(E) function curve (color online)

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Fig. 6. (a) Experimental measurement layout of NaI(Tl) detector; (b) standard material uranium thorium mineral powder; (c) ¹³⁷Cs、²²Na、⁶⁰Co standard point sources

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E / keV	S / %
E / keV	K_max =5	K_max =6	K_max =7	K_max =8	K_max =9	K_max =10	K_max =11	K_max =12
100	0.18	0.04	0.04	0.04	0.04	0.03	0.04	0.03
150	-41.97	72.53	153.30	6.00	-4.41	7.34	0.02	0.03
200	-30.20	39.92	72.55	0.02	0.02	0.04	0.02	-0.03
250	-13.70	12.97	22.36	-0.24	0	-0.36	0.03	0.06
300	-2.76	0	0.02	-0.04	-0.01	-0.16	-0.09	-0.09
400	6.85	0.41	-1.90	0.56	-0.04	0.29	0.16	0.20
500	9.16	0.07	-0.15	0.19	0.17	-0.05	0.10	0.03
600	10.14	-2.97	-0.20	0.09	-0.51	0.06	-0.19	-0.31
800	11.43	-0.23	0.58	-0.48	-0.33	-0.54	-0.27	-0.39
1 000	14.27	0.18	-0.52	0.37	0.24	0.45	0.39	0.26
1 500	19.36	5.61	0.04	-0.05	-0.02	-0.07	-0.16	-0.18
2 000	25.43	-0.02	0.03	0	0	0	0.04	0.05

Table 1. Relative deviation of the calculated values of the dose rate G(E) function from the theoretical calculated value S with different values of K_max

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E/ keV	S / %
E/ keV	M =0	M =1	M =2	M =3
100	0.04	0.04	0.04	-0.06
150	0.02	0.01	0.01	0.75
200	0.02	0.04	0.04	-1.44
250	0.03	-0.46	-0.44	0.52
300	-0.09	-0.05	-0.05	1.16
400	0.16	-0.02	-0.02	0.76
500	0.10	0.27	0.26	-0.47
600	-0.19	-0.16	-0.16	-0.87
800	-0.27	-0.32	-0.32	-0.94
1000	0.39	0.37	0.37	0.64
1500	-0.16	-0.14	-0.14	1.14
2000	0.04	0.04	0.04	-0.65

Table 2. The optimization factor M varies with the relative deviation S

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标准源 Standard sources	尺寸 / mm Size	活度信息 Activity information	相对不确定度 / % Relative uncertainty	日期 Date
⁶⁰Co	Φ25×3	39.9 kBq	3	2017.10
¹³⁷Cs	Φ25×3	8.96 kBq	3	2017.10
²²Na	Φ25×3	38.1 kBq	3	2017.10
铀钍天然系矿石标准物质 Uranium serie and thorium serie ore	Φ50×20	²³⁸U 9.31/²³⁴U 9.42/²³²Th 2.96/²³⁰Th 9.24/ ²²⁶Ra 9.45/²¹⁰Pb 9.41/⁴⁰K 1.13 (Bq/g)	≤3	2015.08

Table 3. Experimental measurement standard source information

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实验测量 Experimental measurements	剂量率仪测量值 / (nGy∙h^-1) Dose rate meter measurements	G(E)计算值/ (nGy∙h^-1) Calculated value of G(E)	相对偏差 / % Relative deviation
实验测量环境 Experimental measurement environment	130.00	131.78	1.37
标准物质铀钍矿粉 Uranium serie and thorium serie ore	135.00	129.50	-4.07
¹³⁷Cs标准源 ¹³⁷Cs standard source	145.00	142.57	-1.68
²²Na标准源 ²²Na standard source	182.00	198.25	8.93
¹³⁷Cs、⁶⁰Co混合点源 ¹³⁷Cs, ⁶⁰Co hybrid point source	250.00	244.08	2.37
¹³⁷Cs、²²Na、⁶⁰Co混合点源 ¹³⁷Cs, ²²Na, ⁶⁰Co hybrid point source	285.00	294.91	3.48

Table 4. Comparison of dose rate calculation by G(E) function and dose rate meter measurement

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