Monte Carlo simulation research on reference neutron radiation of 241Am-Be radionuclide

Song Zhang; Biao Wei; Yixin Liu; Benjiang Mao; Yikun Qian; Yuchen Huang; Peng Feng

doi:10.11884/HPLPB202032.190478

Journals >High Power Laser and Particle Beams >Volume 32 >Issue 5 >Page 056001 > Article

High Power Laser and Particle Beams
Vol. 32, Issue 5, 056001 (2020)

Monte Carlo simulation research on reference neutron radiation of ²⁴¹Am-Be radionuclide

Song Zhang^1、2, Biao Wei¹, Yixin Liu^2、3, Benjiang Mao², Yikun Qian^1、2, Yuchen Huang^1、2, and Peng Feng^1、*

Author Affiliations

¹Key Laboratory of Optoelectronic Technology and Systems of the Education Ministry of China, Chongqing University, Chongqing 400044, China

²Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, China

³Department of Engineering Physics, Tsinghua University, Beijing 100084, China

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DOI: 10.11884/HPLPB202032.190478 Cite this Article

Song Zhang, Biao Wei, Yixin Liu, Benjiang Mao, Yikun Qian, Yuchen Huang, Peng Feng. Monte Carlo simulation research on reference neutron radiation of ²⁴¹Am-Be radionuclide[J]. High Power Laser and Particle Beams, 2020, 32(5): 056001 Copy Citation Text

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Neutron energy spectrum of a 241Am-Be source

Fig. 1. Neutron energy spectrum of a ²⁴¹Am-Be source

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Fig. 2. SRNR models

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Fig. 3. Model of shadow cone

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Fig. 4. Neutron energy spectrum distribution at each point of test under different FRNR

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Fig. 5. Dose rate of each point of test under SRNR

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Fig. 6. Neutron energy spectrum distribution at each point of test under half-cubical type SRNR

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Fig. 7. Dose rate of each point of test under three kinds of reference neutron radiation (shielding material：concrete)

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Fig. 8. Neutron energy spectrum distribution at 0.75 m point of test under three kinds of reference neutron radiation (shielding material：concrete)

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distance/m	dose rate/(μSv·h⁻¹)			④the contribution proportion of air scattering obtained by shadow-cone method(③/①)/%	⑤the theoretical contribution proportion of air scattering[(②—①)/①]/%
distance/m	①FRNR	②FRNR＋air	③FRNR＋air＋ shadow cone
0.75	52.01	52.24	0.70	1.35	0.44
0.85	40.49	40.69	0.52	1.28	0.49
0.95	32.42	32.59	0.42	1.30	0.52
1.05	26.53	26.69	0.36	1.36	0.60
1.15	22.12	22.26	0.32	1.45	0.63
1.25	18.72	18.85	0.28	1.50	0.69
1.35	16.05	16.17	0.25	1.56	0.75

Table 1. The dose rate of each point of test and the contribution proportion of air scattering in FRNR and air FRNR

type	contribution proportion at different distance/%
type	0.75 m	0.85 m	0.95 m	1.05 m	1.15 m	1.25 m	1.35 m
Notes：A—polyethylene containing 5% boron，B—concrete；1—half-cubical type，2—cubical type
A1	8.29	10.03	11.93	14.00	16.16	18.42	20.77
A2	8.56	10.73	13.19	15.89	18.70	21.33	22.90
B1	17.11	21.27	25.80	30.70	35.94	41.52	47.57
B2	18.62	23.89	29.77	36.23	43.16	50.18	55.99

Table 2. The contribution proportion of scattered neutron dose rate at each point of test under SRNR (shadow-cone method)

type	contribution proportion at different distance/%
type	0.75 m	0.85 m	0.95 m	1.05 m	1.15 m	1.25 m	1.35 m
Notes：A—polyethylene containing 5% boron，B—concrete；1—half-cubical type，2—cubical type
A1	7.52	9.35	11.32	13.39	15.59	17.91	20.37
A2	8.09	10.38	13.02	16.02	19.45	23.36	27.85
B1	16.59	20.81	25.37	30.32	35.64	41.35	47.45
B2	18.70	24.05	30.21	37.24	45.34	54.72	65.89

Table 3. The contribution proportion of scattered neutron dose rate at each point of test under SRNR (theoretical value)

type		contribution proportion at different distance/%
type		0.75 m	0.85 m	0.95 m	1.05 m	1.15 m	1.25 m	1.35 m
Notes：1—half-cubical type，2—cubical type
FRNR＋air	shadow-cone method	1.35	1.28	1.30	1.36	1.45	1.50	1.56
ARNR	shadow-cone method	10.97	13.65	16.57	19.69	22.99	26.46	30.07
SRNR(1)	shadow-cone method	17.11	21.27	25.80	30.70	35.94	41.52	47.57
SRNR(2)	shadow-cone method	18.62	23.89	29.77	36.23	43.16	50.18	55.99
FRNR＋air	theoretical value	0.44	0.49	0.52	0.60	0.63	0.69	0.75
ARNR	theoretical value	10.48	13.12	16.01	19.07	22.36	25.76	29.37
SRNR(1)	theoretical value	16.59	20.81	25.37	30.32	35.64	41.35	47.45
SRNR(2)	theoretical value	18.70	24.05	30.21	37.24	45.34	54.72	65.89

Table 4. The contribution proportion of scattered neutron dose rate at each point of test under three kinds of reference neutron radiation (shielding material：concrete)

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