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

Journal of Radiation Research and Radiation Processing, Volume. 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

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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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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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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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

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

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

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 3. Experimental measurement standard source information

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Table 3. Experimental measurement standard source information

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

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

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

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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

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Paper Information

Category: Research Articles

Received: Mar. 28, 2023

Accepted: Apr. 20, 2023

Published Online: Dec. 27, 2023

The Author Email:

DOI:10.11889/j.1000-3436.2023-0026

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

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 Kmax

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 Kmax

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

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

Table 3. Experimental measurement standard source information

Table 3. Experimental measurement standard source information

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

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

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

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