NUCLEAR TECHNIQUES, Volume. 46, Issue 1, 010401(2023)
Design of calibration device for real-time on-line monitoring system of water radioactivity
Figures & Tables(14)
Fig. 1. Structure diagram of real-time on-line monitoring system of water radioactivity
Fig. 7. Effect of small hole radius and distance from source to calibration hole on solid angle
Fig. 9. Relationship between calibration source position and detection efficiency
Fig. 10. Relationship between opening radius and detection efficiency
Table 1. Characteristic peak energy corresponding to each nuclide
View tableView in ArticleTable 1. Characteristic peak energy corresponding to each nuclide
核素Nuclide 特征峰 Peak energy / keV 241Am 59.537 238U 66.376 133Ba 80.997, 276.4, 302.851, 356.013 152Eu 121.782, 344.279, 778.904, 964.079, 1 085.869, 1 112.069 57Co 122.06, 136.48 235U 143.76, 185.72 226Ra 186.21 131I 284.3, 636.97 192Ir 295.96, 308.46, 316.51, 364.48, 468.07 208Tl 510.84, 583.84, 860.37, 2 614.7 22Na 511, 1 274.5 214Bi 609.31, 1 120.3, 1 764.5 137Cs 661 60Co 1 170, 1 330 40K 1 460
Table 2. Monte Carlo simulation shows the influence of sliding lead block thickness on detection efficiency
View tableView in ArticleTable 2. Monte Carlo simulation shows the influence of sliding lead block thickness on detection efficiency
滑动铅块厚度
Thickness of sliding
lead block / cm
有滑动铅块屏蔽下探测器
对137Cs的探测效率
Detection efficiency of 137Cs under
the shielding of sliding lead block
无滑动铅块屏蔽下探测器
对137Cs的探测效率
Detection efficiency of 137Cs by detector
without sliding lead block shielding
与无屏蔽状态相比探测效率减少的百分比
Percentage reduction in detection efficiency compared to unshielded state / %
1 3.432×10-4 1.137×10-3 69.82 2 1.022×10-4 1.073×10-3 90.48 3 2.87×10-5 1.021×10-3 97.19 4 8.775×10-6 9.65×10-4 99.08 5 2.375×10-6 9.16×10-4 99.74
Table 3. Background test of calibration device (1 h)
View tableView in ArticleTable 3. Background test of calibration device (1 h)
137Cs峰位
137Cs peak position
137Cs能窗总计数率
137Cs energy window count rate
平均值
Average value
未放置校准源
Calibration source not placed
校准孔打开
Calibration hole open
465 0.142 0.138 465 0.138 465 0.133 校准孔关闭
Calibration hole close
465 0.115 0.108 465 0.111 465 0.099 放置校准源
Place calibration source
校准孔打开
Calibration hole open
465 0.523 0.536 464 0.550 465 0.533 校准孔关闭
Calibration hole close
465 0.184 0.187 465 0.188 465 0.189
Table 4. measured calibration data
View tableView in ArticleTable 4. measured calibration data
校准时间
Calibration time
137Cs标准峰位
137Cs standard peak position
校准后137Cs峰位
137Cs peak position after calibration
峰位偏差
Peak position deviation / %
137Cs峰全能峰标准总计数
Total standard count of 137Cs peak
校准后137Cs峰全能峰总计数
Total count of 137Cs peak after calibration
137Cs峰全能峰总计数相对变化率
Total totipotency peak relative change rate of 137Cs / %
2020/11/25 464 467 0.22 200 204 2.00 2020/12/1 464 467 0.65 200 203 1.50 2020/12/8 464 462 0.65 200 191 -4.50 2020/12/14 464 461 -0.43 200 208 4.00 2020/12/23 464 463 -0.65 200 200 0.00 2020/12/30 464 465 -0.22 200 209 4.50
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Shengliang GUO, Yezhou XIANG, Liangquan GE, Xiaoqin DENG, Liang WANG, Mingtao LUO, Maolin LAI, Xiaojiao ZHU. Design of calibration device for real-time on-line monitoring system of water radioactivity[J]. NUCLEAR TECHNIQUES, 2023, 46(1): 010401
Paper Information
Category: Research Articles
Received: May. 10, 2022
Accepted: --
Published Online: Feb. 17, 2023
The Author Email: GUO Shengliang (13831779@qq.com)
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