Health physics最新文献_第5页

Measurement of Radon Levels and Radiological Risk Assessment of Borehole Water in Oil-Producing Area of Ukwuani, Southern Nigeria. 尼日利亚南部Ukwuani油田井水氡水平测量及放射性风险评价

IF 1.2 4区医学

Health physics Pub Date : 2026-09-02 DOI: 10.1097/HP.0000000000002213

Augustine Onyema Nwabuoku

{"title":"Measurement of Radon Levels and Radiological Risk Assessment of Borehole Water in Oil-Producing Area of Ukwuani, Southern Nigeria.","authors":"Augustine Onyema Nwabuoku","doi":"10.1097/HP.0000000000002213","DOIUrl":"https://doi.org/10.1097/HP.0000000000002213","url":null,"abstract":"A number of communities in Ukwuani Local Government Area of Delta State are known to host several crude oil companies with exploration activities ongoing and may be responsible for the presence of high radon levels in drinking water. Radon (222Rn) has emerged as a major health concern due to its radiotoxic effects and radiation dose to internal organs. Therefore, this work aimed to measure radon levels in borehole water and assess the radiological risk. Thirty water samples were collected from borehole sources in the sampled area into containers. Analysis was done using a RAD7 device for radon measurement. After analysis, radon levels in the samples ranged from 1.373 Bq L-1 to 11.974 Bq L-1 with a mean value of 5.886 Bq L-1. The average radon value obtained here is below the US Environmental Protection Agency (US EPA) reference level of 11.1 Bq L-1. The World Health Organization (WHO) recommended limit is also above the mean radon value recorded in this study. This implies that borehole water in Ukwuani LGA is within radon safe limit with no significant threat to human health. These findings provide data to inform policy implementation and support interventions for safe drinking water resources and to serve as reference data for further studies on radon monitoring of other water sources within southern Nigeria.","PeriodicalId":12976,"journal":{"name":"Health physics","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148880015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Natural Radioactivity Levels of 226 Ra and 228 Ra and Associated Radiological Risk in Borehole Water from Ogwashi-Uku, Delta State, Nigeria. 尼日利亚三角洲州Ogwashi-Uku钻孔水中226 Ra和228 Ra的天然放射性水平及相关辐射风险。

IF 1.2 4区医学

Health physics Pub Date : 2026-09-01 Epub Date: 2026-03-10 DOI: 10.1097/HP.0000000000002102

Augustine Onyema Nwabuoku, Ogheneovo Akpoyibo

{"title":"Natural Radioactivity Levels of 226 Ra and 228 Ra and Associated Radiological Risk in Borehole Water from Ogwashi-Uku, Delta State, Nigeria.","authors":"Augustine Onyema Nwabuoku, Ogheneovo Akpoyibo","doi":"10.1097/HP.0000000000002102","DOIUrl":"10.1097/HP.0000000000002102","url":null,"abstract":"Radiological investigation of 26 borehole water samples in Ogwashi-Uku, Nigeria has been carried out using γ -ray spectroscopy to assess the 226 Ra and 228 Ra levels and evaluate the health risks posed to indigenes of Ogwashi-Uku. Activity concentrations of 226 Ra range from 1.8 to 21.6 Bq L -1 with an average mean of 7.99 Bq L -1 and 1.9 to 11.3 Bq L -1 for 228 Ra with an average mean of 4.90 Bq L -1 , respectively. The calculated mean annual effective doses for the different age groups received by the local populace due to the ingestion of 226 Ra and 228 Ra were found to be above WHO permissible limit of 0.1 mSv y -1 for 228 Ra and 226 Ra. The mean value of excess lifetime cancer risks were found to be higher than WHO permissible limits of 10 -3 . This implies a risk of developing cancer immediately over a lifetime due to the consumption of the sampled borehole water. The results in this study may form part of a larger baseline values of the database in Delta State, Nigeria, and the world that will help in setting up radiological safety guidelines with respect to consumption of borehole water.","PeriodicalId":12976,"journal":{"name":"Health physics","volume":" ","pages":"210-217"},"PeriodicalIF":1.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147432288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evolutionary Pressures Behind the Translocation of Hematopoiesis to the Bone Marrow Cavity in Terrestrial Vertebrates. 陆生脊椎动物骨髓腔造血易位背后的进化压力。

IF 1.2 4区医学

Health physics Pub Date : 2026-09-01 Epub Date: 2026-02-02 DOI: 10.1097/HP.0000000000002086

P Andrew Karam, Robert P Gale, James S Welsh

{"title":"Evolutionary Pressures Behind the Translocation of Hematopoiesis to the Bone Marrow Cavity in Terrestrial Vertebrates.","authors":"P Andrew Karam, Robert P Gale, James S Welsh","doi":"10.1097/HP.0000000000002086","DOIUrl":"10.1097/HP.0000000000002086","url":null,"abstract":"Nearly 400 million years ago, vertebrate life began to transition from a purely aquatic existence to the terrestrial environment. Concurrently, exposure to ionizing radiation from cosmic and geologic sources increased substantially. Around the same time, vertebrate hematopoietic stem cells (HSCs) migrated from the liver and peri-nephric parts of the abdomen into the interior of bones. Interestingly, among today's vertebrates, only fish lack bone marrow. All other extant vertebrates maintain their HSCs in the bone marrow cavity. We propose protection from sub-lethal DNA damage to these long-lived radiation-sensitive cells because of exposure to ionizing radiation is why HSCs are sequestered with the bone marrow cavity. Our calculations support this hypothesis. Residence in the bone marrow cavity reduced exposure to penetrating background radiation and the concomitant DNA damage by at least 20%. This reduction was even more significant radio-biologically when considering the relatively hypoxic conditions within the bone marrow cavity and oxygen's role in enhancing radiogenic DNA damage. This may be particularly relevant considering the oxygen-rich atmosphere in existence at the time of transitioning to a terrestrial habitat. Given the exquisite sensitivity of HSCs and proliferating blood cells to radiation, we propose this translocation provided a selective advantage and that protection from sub-lethal radiogenic DNA damage at least partially explains translocation of hematopoietic cells to the bone marrow cavity in terrestrial vertebrates.","PeriodicalId":12976,"journal":{"name":"Health physics","volume":" ","pages":"179-186"},"PeriodicalIF":1.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146105331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of 7.25 T Pulsed High Magnetic Field on Collagen-Induced Arthritis and Normal Mice: A Safety and Efficacy Study. 7.25 T脉冲强磁场对正常小鼠胶原性关节炎的安全性和有效性研究

IF 1.2 4区医学

Health physics Pub Date : 2026-09-01 Epub Date: 2026-02-18 DOI: 10.1097/HP.0000000000002097

Ruiyuan Zhang, Yuyao Yang, Yifei Li, Liang Li, Shuang Wang, Shaobo Liu, Lingling Yu, Shenghao Tu

{"title":"Effects of 7.25 T Pulsed High Magnetic Field on Collagen-Induced Arthritis and Normal Mice: A Safety and Efficacy Study.","authors":"Ruiyuan Zhang, Yuyao Yang, Yifei Li, Liang Li, Shuang Wang, Shaobo Liu, Lingling Yu, Shenghao Tu","doi":"10.1097/HP.0000000000002097","DOIUrl":"10.1097/HP.0000000000002097","url":null,"abstract":"Introduction: As a new research technology, pulsed high magnetic fields (PHMF) have been gradually used in many fields such as industry, communication, and medical treatment. However, there is still a lack of studies on the safety of PHMF and their effects on autoimmune inflammation. Our work aims to expand the possibilities of PHMF application in autoimmune disease therapy and provide a foundation for further refined research into the safety of PHMF.Materials and methods: We used 30 DBA/1J mice to investigate the effects of 7.25 T PHMF exposure for 10 days on normal mice and collagen-induced arthritis (CIA) mice, a kind of autoimmune inflammation model.Results: White blood cell counts, neutrophil counts, eosinophil counts, basophil counts, neutrophil percentage, the variable coefficient of red blood cell distribution width, and the standard deviation of red blood cell distribution width of normal mice were significantly up-regulated and lymphocyte percentage was significantly down-regulated by twice-daily 7.25 T PHMF. The body weight, other blood routine indexes, and organ pathological manifestations were not significantly affected by the PHMF. Moreover, different doses of PHMF exposure did not have significant effects on body weight, arthritis score, joint pathology, synovitis score, and the expression of inflammatory cytokines in CIA mice.Conclusion: In general, daily short-term exposure to 7.25 T PHMF does not have severe effects on normal mice and CIA model mice, and more studies are needed to verify its safety and efficacy.","PeriodicalId":12976,"journal":{"name":"Health physics","volume":" ","pages":"187-200"},"PeriodicalIF":1.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146219562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Online Tool for Calculating A Priori Scan Minimum Detectable Concentrations for Common Soil and Structural Surface Detectors. 计算普通土壤和结构表面探测器的先验扫描最小可检测浓度的在线工具。

IF 1.2 4区医学

Health physics Pub Date : 2026-09-01 Epub Date: 2026-03-09 DOI: 10.1097/HP.0000000000002085

David A King, Nickolas Altic

引用次数: 0

HEALTH PHYSICS SOCIETY . 2026 AFFILIATE MEMBERS. 健康物理学会。2026个附属会员。

IF 1.2 4区医学

Health physics Pub Date : 2026-09-01 Epub Date: 2026-07-28 DOI: 10.1097/01.HP.0001239756.73993.a2

引用次数: 0

Influence of Thyroid Mass and Shape on the Internal Dosimetry of 131 I. 甲状腺肿块和形状对131 I内剂量学的影响。

IF 1.2 4区医学

Health physics Pub Date : 2026-09-01 DOI: 10.1097/HP.0000000000002216

Lai Zhou, Yuanyuan Liu, Bin Wu, Xiangpeng Meng, Yu Wang, Ao Ju, Jiali Qian, Sirun Gong, Xinxin Chen, Congchong Yan, Jianping Cheng

{"title":"Influence of Thyroid Mass and Shape on the Internal Dosimetry of 131 I.","authors":"Lai Zhou, Yuanyuan Liu, Bin Wu, Xiangpeng Meng, Yu Wang, Ao Ju, Jiali Qian, Sirun Gong, Xinxin Chen, Congchong Yan, Jianping Cheng","doi":"10.1097/HP.0000000000002216","DOIUrl":"https://doi.org/10.1097/HP.0000000000002216","url":null,"abstract":"Radionuclide 131I is of vital importance in radiation protection and nuclear medicine. Its internal dose is mainly concentrated in the thyroid. The S value is a key parameter in the calculation of internal dose. It represents the radiation-weighted energy deposition per unit mass of the target organ when the radionuclide undergoes a single decay of the source organ. As the thyroid is both the source organ and the target organ, its mass and shape may affect the S value. Therefore, this paper studies the influence of thyroid mass and shape on the S value. In this study, based on the thyroid model of the ICRP adult mesh-type reference computational phantoms (MRCPs), a series of thyroids with different masses were generated by proportionally scaling the thyroid volume while maintaining its original shape. The influence of mass on the S value (thyroid←thyroid) is then systematically analyzed using the Geant4 Monte Carlo simulation platform. To further explore the influence of shape, this paper reviews the S values (thyroid←thyroid) simulated by other researchers using thyroid models of different shapes and compares them with the research results of this paper. The research results show that the S value has a good inversely proportional relationship with thyroid mass. It can be precisely fitted as a linear function of the reciprocal of mass, with a correlation coefficient (R2) of 0.9999. The result of this formula has a deviation of within 5.67% compared with the results in the literature. This study demonstrates that the difference in thyroid shape has a relatively weak influence on the S value, and the empirical formula fitted in this paper may have good universality and reliability.","PeriodicalId":12976,"journal":{"name":"Health physics","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148873924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization of Attila4MC Mesh Parameters in Large-scale Models for Nuclear Decommissioning Planning. 核退役规划大尺度模型Attila4MC网格参数优化

IF 1.2 4区医学

Health physics Pub Date : 2026-09-01 Epub Date: 2026-02-02 DOI: 10.1097/HP.0000000000002105

Justina A M Freilich, Camille J Palmer

{"title":"Optimization of Attila4MC Mesh Parameters in Large-scale Models for Nuclear Decommissioning Planning.","authors":"Justina A M Freilich, Camille J Palmer","doi":"10.1097/HP.0000000000002105","DOIUrl":"10.1097/HP.0000000000002105","url":null,"abstract":"The anticipated increase in nuclear decommissioning in the coming decades requires innovative approaches to maintain worker exposure as low as reasonably achievable. Occupational dose, an important component of cost-benefit analysis and work planning in decommissioning, can be estimated using radiation transport codes. Monte Carlo N-Particle (MCNP) is a robust, well-established code that has been used to model a breadth of geometries and source terms. Attila4MC offers a graphical user interface for users to build and run MCNP simulations and create an unstructured mesh of computer-aided design (CAD) models with tunable meshing parameters, including element edge length bounds and curvature refinement features. To understand how these parameters might be optimized for a large-scale model for dose estimation, a building containing gloveboxes, a hot cell, ventilation, robotic characterization tools, and operators was modeled in a CAD program. Source terms from available literature were applied to the equipment, and the operator dose was tracked for several exposure geometries. Mesh parameters, including maximum edge length (MEL) bounds, curvature refinement part selection, d/h ratio, and minimum edge length, were varied, and the resulting dose estimates were compared. The upper MEL bound had little effect on the estimated dose rate, but the varying the lower bound resulted in a 40% change in dose rate compared to the default case. Curvature refinement increased the MCNP figure of merit very slightly, about 2.6% when applied globally, but increased by over 31% when applied to only selected parts within the model. Both minimum edge length and d/h ratio showed a maximum change in dose rate of 10% compared to the default case for the values investigated in this study. Finally, the dose rate results suggest that the use of robotic or remote characterization methods may reduce occupational dose to workers by several orders of magnitude for the modeled scenario.","PeriodicalId":12976,"journal":{"name":"Health physics","volume":" ","pages":"218-232"},"PeriodicalIF":1.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146105366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

US NRC Medical Event Reports Related to Unplanned Dose to Fetus or Embryo, 2005-2024. 2005-2024年NRC与胎儿或胚胎意外剂量相关的医疗事件报告。

IF 1.2 4区医学

Health physics Pub Date : 2026-09-01 Epub Date: 2026-02-10 DOI: 10.1097/HP.0000000000002084

Jussi Sillanpaa, Jianling Yuan

引用次数: 0

In Memoriam: JOHN W. POSTON, Sr., 1937-2025. 纪念：约翰·w·波斯顿，1937-2025。

IF 1.2 4区医学

Health physics Pub Date : 2026-09-01 Epub Date: 2026-07-28 DOI: 10.1097/HP.0000000000002114

引用次数: 0