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唐晓川,男,1984年生,高级工程师,博士,主要从事放射性勘查计量、核技术应用方面的工作。E-mail:insidelook007@163.com |
收稿日期: 2025-03-10
修回日期: 2025-03-21
网络出版日期: 2025-11-06
基金资助
中国核工业地质局基础地质项目(201732-3)
中国核工业地质局基础地质项目(201944-2)
Theoretical calculations and validation in the design of field verification equipment for gamma loggers
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TANG Xiaochuan,male,born in 1984,senior engineer,PhD,focusing on radiological survey metrology,nuclear technology applications. E-mail:insidelook007@163.com |
Received date: 2025-03-10
Revised date: 2025-03-21
Online published: 2025-11-06
Supported by
Basic Geology Project of China Nuclear Geology(201732-3)
Basic Geology Project of China Nuclear Geology(201944-2)
镭源作为铀矿勘查工作中γ测井仪等放射性测量仪器的野外核查标准源,发挥了检测仪器计量性能的良好作用。但受限于国家安全、环保政策,我国现有固体镭源数量难以满足铀矿勘查工作量日益增长的需求,急需开展替代核查装置的研制工作。设计采用天然铀矿粉等材料研制核查装置,对放射性测量仪器进行期间核查。依据γ辐射场理论,计算了核查装置的几何尺寸对内部γ场的影响关系,并通过实验验证。内部钻孔直径50 mm、钻孔轴向长度600 mm的环状柱体核查装置,可以保证核查装置中心具有200 mm的饱和坪区,为探测器的便捷放置留有至少100 mm的冗余。在未达到饱和厚度前,内部照射量率与水平方向矿层厚度正相关。通过理论计算获得了γ测井仪核查装置的实用几何尺寸,避免了大量保守试验的材料浪费和时间浪费。
唐晓川 , 杜一滨 , 王宇莹 , 管少斌 , 沈长枫 . γ测井仪野外核查装置设计过程中的理论计算及验证[J]. 世界核地质科学, 2025 , 42(3) : 630 -639 . DOI: 10.3969/j.issn.1672-0636.2025.03.013
As the field verification standard for radioactive measuring instruments such as gamma loggers in uranium exploration work,radium sources have played a good role in controlling the metrological performance of the instruments. However,due to national security and environmental protection policies,the existing number of solid radium sources in China can hardly meet the increasing demand of uranium exploration workload,and there is an urgent need to carry out the development of alternative verification devices. It is planned to use natural uranium ore powder and other materials to develop verification devices to verify the radioactivity measuring instruments during the period. Based on the theory of γ radiation field,the relationship between the geometry of the verification device and the internal γ field was calculated,and it was experimentally verified that an annular column verification device with an internal bore diameter of 50 mm and an axial length of 600 mm can ensure that the center of the verification device has a saturated plateau area of 200 mm,leaving at least 100 mm redundancy for convenient detector placement. The internal irradiation volume rate is positively correlated with the thickness of the horizontally oriented ore layer before the saturation thickness is reached. The practical geometry of the γ logger verification device was determined by theoretical calculations,avoiding the waste of material and time in a large number of conservative designs.
表1 钻孔轴向矿层厚度变化计算结果表Table 1 Calculation results for variation of axial ore bed thickness in drill hole |
| 矿层厚度/ cm | 中心点照射量率/ (nC·kg-1·h-1) | 矿层厚度/cm | 中心点照射量率/ (nC·kg-1·h-1) | 矿层厚度/ cm | 中心点照射量率/ (nC·kg-1·h-1) |
|---|---|---|---|---|---|
| 10 | 1 243 | 90 | 2 509 | 170 | 2 531 |
| 20 | 1 812 | 100 | 2 517 | 180 | 2 531 |
| 30 | 2 120 | 110 | 2 522 | 190 | 2 532 |
| 40 | 2 294 | 120 | 2 526 | 200 | 2 532 |
| 50 | 2 382 | 130 | 2 528 | 210 | 2 532 |
| 60 | 2 439 | 140 | 2 529 | 220 | 2 532 |
| 70 | 2 475 | 150 | 2 529 | 230 | 2 533 |
| 80 | 2 498 | 160 | 2 530 | 240 | 2 533 |
表2 照射量率相对偏差计算结果表Table 2 Calculation result of the relative deviation vs the exposure rate |
| 矿层厚度/cm | 与饱和无限大照射量率相对偏差/% | 矿层厚度/cm | 与饱和无限大照射量率相对偏差/% | 矿层厚度/cm | 与饱和无限大照射量率相对偏差/% |
|---|---|---|---|---|---|
| 10 | -50.9 | 90 | -0.9 | 170 | -0.1 |
| 20 | -28.5 | 100 | -0.6 | 180 | -0.1 |
| 30 | -16.3 | 110 | -0.4 | 190 | -0.1 |
| 40 | -9.4 | 120 | -0.3 | 200 | 0 |
| 50 | -5.9 | 130 | -0.2 | 210 | 0 |
| 60 | -3.7 | 140 | -0.2 | 220 | 0 |
| 70 | -2.3 | 150 | -0.1 | 230 | 0 |
| 80 | -1.4 | 160 | -0.1 | 240 | — |
表3 与各自中心点处相对偏差计算结果表Table 3 Calculated relative deviation from the respective center point |
| 轴向长度80 cm | 轴向长度60 cm | 轴向长度50 cm | 轴向长度40 cm | ||||
|---|---|---|---|---|---|---|---|
| 与矿段轴向中心点距离/cm | 相对偏差/% | 与矿段轴向中心点距离/cm | 相对偏差/% | 与矿段轴向中心点距离/cm | 相对偏差/% | 与矿段轴向中心点距离/cm | 相对偏差/% |
| -40 | -49.4 | — | — | — | — | — | — |
| -30 | -13.1 | -30 | -48.2 | -25 | -47.2 | — | — |
| -20 | -3.5 | -20 | -11.2 | -20 | -21.2 | -20 | -45.5 |
| -10 | -0.8 | -10 | -1.8 | -10 | -3.6 | -10 | -7.3 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 10 | -0.8 | 10 | -1.8 | 10 | -3.6 | 10 | -7.3 |
| 20 | -3.5 | 20 | -11.2 | 20 | -21.2 | 20 | -45.5 |
| 30 | -13.1 | 30 | -48.2 | 25 | -47.2 | — | — |
| 40 | -49.4 | — | — | — | — | — | — |
表4 孔径变化的计算结果Table 4 Calculated results of pore size changes |
| 轴向矿层厚度/cm | 孔径/cm | 井轴中心点照射量率/(nC·kg-1·h-1) | 相对偏差/% |
|---|---|---|---|
| 240 | 9 | 2 533 | — |
| 60 | 4 | 2 456 | -3 |
| 60 | 5 | 2 441 | -3.6 |
| 60 | 6 | 2 425 | -4.2 |
| 60 | 7 | 2 410 | -4.9 |
| 60 | 8 | 2 394 | -5.5 |
| 60 | 9 | 2 378 | -6.1 |
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