High Power Laser and Particle Beams, Volume. 34, Issue 2, 026016(2022)
Development and test of neutron activation simulation program based on JMCT software
Figures & Tables(14)
Fig. 3. Output file of radionuclide numbers of neutron activation simulation program
Fig. 6. Relationship curves between numbers of 7 radionuclides and idle time
Fig. 7. Spectra of γ rays entering HPGe detector under different neutron irradiation time and idle time
Table 1. Size, mass and ingredient parameters of structures in nuclear warhead model
View tableView in ArticleTable 1. Size, mass and ingredient parameters of structures in nuclear warhead model
structure outer radius/cm mass/kg ingredient parameters hole 5.77 0.0 vacuum fissile core 7.0 12.0 weapons-grade uranium (234U(1%), 235U(93.3%), 238U(5.5%), O(0.2%)) reflector 9.0 3.0 natural beryllium tamper 12.0 79.0 Model 1: depleted uranium (235U(0.3%), 238U(99.7%)); Model 2: Natural tungsten explosive 22.0 71.0 explosive (atom number ratio is H:C:N:O=2:1:2:2) shell 23.0 17.0 natural aluminium
Table 2. Neutron fields of fissile materials
View tableView in ArticleTable 2. Neutron fields of fissile materials
material nuclide portion neutron yield/neutrons∙s−1 (α, n) reaction spontaneous fission weapon-grade uranium 234U 1% 50 5.546 235U 93.3% 0.012 0.299 238U 5.5% 0.001 13.57 O 0.2% 0 0 depleted uranium 235U 0.3% 0 0.299 238U 99.7% 0 13.57
Table 3. Numbers of neutrons emitted from nuclear warhead model
View tableView in ArticleTable 3. Numbers of neutrons emitted from nuclear warhead model
simulation software contribution of fission core to neutron leakage from shell (neutrons/s) contribution of tamper to neutron leakage from shell (neutrons/s) total neutron leakage (neutrons/s) Model 1 neutron activation simulation program 18 718 736 MCNP5 18 720 738 Model 2 neutron activation simulation program 13 0 13 MCNP5 13 0 13
Table 4. Radionuclides in nuclear warhead model
View tableView in ArticleTable 4. Radionuclides in nuclear warhead model
radionuclide nuclear reaction half-life decay type 16N 16O(n,p)16N 7.130 s β−, γ 15O 16O(n,2n)15O 122.240 s β+ 13N 14N(n,2n)13N 9.970 min β+, β−, γ 11C 12C(n,2n)11C 20.48 min β+, β−, γ 14C 14N(n,p)14C 5730 a β−
Table 5. Production of radionuclides in explosive
View tableView in ArticleTable 5. Production of radionuclides in explosive
simulation software neutrons simulated equivalent measuring time number of radionuclide 16N 15O 13N 11C 14C Model 1 neutron activation simulation program 107 9.19×103 s 47 0 4 0 5.56×106 GEANT4 107 9.19×103 s 61 0 5 0 5.72×106 Model 2 neutron activation simulation program 107 5.23×105 s 35 0 2 0 5.93×106 GEANT4 107 5.23×105 s 36 0 9 0 6.07×106
Table 6. Element composition of concrete floor model
View tableView in ArticleTable 6. Element composition of concrete floor model
element atom proportion/% nuclide H 13.3 1H/2H O 73.7 16O/17O Na 1.8 23Na Mg 0.3 24Mg/25Mg/26Mg Al 4.2 27Al Si 0.3 28Si/29Si/30Si K 1.2 39K/40K/41K Ca 4.8 40Ca/42Ca/43Ca/44Ca/46Ca/48Ca Fe 0.4 54Fe/56Fe/57Fe/58Fe
Table 7. Information of activation products of concrete floor model
View tableView in ArticleTable 7. Information of activation products of concrete floor model
radionuclide half-life decay type yield/s−1 activation reaction 14C 5715 a β− 1.59 17O(n,α) 16N 7.13 s β−,γ 0.613 16O(n,p) 20F 11.0 s β−,γ 0.432 23Na(n,α) 23Ne 37.2 s β−,γ 1.05 23Na(n,p) 24Na 14.96 h β−,γ 14.8 23Na(n,γ), 24Mg(n,p), 27Al(n,α) 27Mg 9.45 min β−,γ 7.05 27Al(n,p) 28Al 2.25 min β−,γ 15.6 27Al(n,γ), 28Si(n,p) 36Cl 3.01×105 a β+,β−,EC 20.1 39K(n,α) 37Ar 35.0 d EC 82.7 40Ca(n,α) 39Ar 268 a β− 61.6 39K(n,p), 42Ca(n,α) 41Ar 1.82 h β−,γ 0.0700 41K(n,p) 40K 1.26×109 a β+,β−,EC,γ 261 39K(n,γ), 40Ca(n,p) 42K 12.36 h β−,γ 2.04 41K(n,γ), 42Ca(n,p) 41Ca 1.02×105 a EC 29.4 40Ca(n,γ) 45Ca 162.7 d β− 1.18 44Ca(n,γ) 49Ca 8.72 min β− 0.134 48Ca(n,γ) 54Mn 312 d EC,γ 0.835 54Fe(n,p) 56Mn 2.579 h β−,γ 0.141 56Fe(n,p) 55Fe 2.73 a EC 0.798 54Fe(n,γ)
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Meng Huang, Jianyu Zhu, Jun Wu, Songbai Zhang, Rui Li, Gang Li. Development and test of neutron activation simulation program based on JMCT software[J]. High Power Laser and Particle Beams, 2022, 34(2): 026016
Paper Information
Category: Monte Carlo Methods and Applications
Received: Aug. 17, 2021
Accepted: Dec. 14, 2021
Published Online: Jan. 26, 2022
The Author Email: Zhu Jianyu (zhujyu@126.com)
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