Alene Assefa Nigus, Arbese Yisak
Department of Physics, CNCS, Mekelle University, Tigray, Ethiopia.
Ayder Comprehensive Specialized Hospital, Mekelle University, Tigray, Ethiopia.
Health Phys. 2025 May 1;128(5):365-370. doi: 10.1097/HP.0000000000001911. Epub 2025 Jan 28.
In the present study, we are presenting the results of radium content, radon concentration, and radon exhalation rates (both mass and area) for 32 soil samples collected from different locations of Abi-Adi Town, Ethiopia, by using the sealed can technique containing a LR-115 Type-II plastic detector. The values of radium content from soil samples were found to vary from 35.26 Bq kg -1 to 101.78 Bq kg -1 , with a mean value of 70.25 Bq kg -1 . The mass and area exhalation rates of radon were found to be from 2.72 × 10 -6 Bq kg -1 d -1 to 7.87 × 10 -6 Bq kg -1 d -1 and from 0.76 × 10 -4 Bq m -2 d -1 to 2.20 × 10 -4 Bq m -2 d -1 , with a mean value of 5.43 × 10 -6 Bq kg -1 d -1 and 1.52 × 10 -4 Bq m -2 d -1 , respectively. The outdoor and indoor annual effective dose equivalent varied from 0.24 mSv y -1 to 0.68 mSv y -1 and from 0.06 mSv y -1 to 0.17 mSv y -1 with a mean value of 0.37 mSv y -1 and 0.09 mSv y -1 , respectively. The working level varied from 2.50 mWL to 7.21 mWL with a mean value of 3.94 mWL. From the results of this study, we found that there was a positive correlation between radium content and radon exhalation rates in soil samples. The radium content values determined in soil samples are less than the permissible value of 370 Bq kg -1 recommended by Organization for Economic Cooperation and Developments as acceptable for safe use. Thus, results reveal that the area under investigation is safe as far as the health hazards of radon are concerned.
在本研究中，我们展示了通过使用装有LR - 115 II型塑料探测器的密封罐技术，对从埃塞俄比亚阿比 - 阿迪镇不同地点采集的32个土壤样本进行镭含量、氡浓度和氡析出率（质量和面积）测定的结果。土壤样本中的镭含量值在35.26 Bq kg⁻¹至101.78 Bq kg⁻¹之间变化，平均值为70.25 Bq kg⁻¹。氡的质量析出率和面积析出率分别在2.72×10⁻⁶ Bq kg⁻¹ d⁻¹至7.87×10⁻⁶ Bq kg⁻¹ d⁻¹以及0.76×10⁻⁴ Bq m⁻² d⁻¹至2.20×10⁻⁴ Bq m⁻² d⁻¹之间，平均值分别为5.43×10⁻⁶ Bq kg⁻¹ d⁻¹和1.52×10⁻⁴ Bq m⁻² d⁻¹。室外和室内年有效剂量当量分别在0.24 mSv y⁻¹至0.68 mSv y⁻¹以及0.06 mSv y⁻¹至0.17 mSv y⁻¹之间变化，平均值分别为0.37 mSv y⁻¹和0.09 mSv y⁻¹。工作水平在2.50 mWL至7.21 mWL之间变化，平均值为3.94 mWL。从本研究结果来看，我们发现土壤样本中的镭含量与氡析出率之间存在正相关。土壤样本中测定的镭含量值低于经济合作与发展组织推荐的安全使用可接受的370 Bq kg⁻¹允许值。因此，结果表明就氡对健康的危害而言，所调查区域是安全的。
