Isotopes in Environmental and Health Studies最新文献

{"title":"Alpha emitter concentrations of natural radionuclides and radiological hazard assessment of soil samples in the Halabja governorate, Iraq.","authors":"Hiwa Mohammad Qadr, Najeba Farhad Salih, Ari Maghdid Hamad","doi":"10.1080/10256016.2025.2550449","DOIUrl":"10.1080/10256016.2025.2550449","url":null,"abstract":"<p><p>Naturally occurring radioactive gases in soil, such as radon, are recognized for their significant impact on local air quality and potential health risks to nearby populations. The disturbance of the Earth's surface through excavation activities can enhance the release of these gases, increasing the likelihood of radon exposure. This study investigates soil samples collected from various sites across the Halabja governorate in Iraq to provide a comprehensive evaluation of the area's radiological profile. The primary objective is to measure alpha emitter concentrations of radon, radium and uranium present in the soil. Alpha particle tracks emitted from radon gas were recorded using a CR-39 detector. To enlarge and reveal the alpha tracks, the samples underwent chemical etching using a 6.25 N NaOH solution at 70 °C for seven hours, after which the tracks were analysed under a microscope. The findings demonstrate that alpha emitter concentrations of ²²²Rn, ²²⁶Ra and ²³⁸U ranged from 119.76 to 228.55 Bq/m³, 0.22 to 0.42 Bq/kg and 2.92 to 5.57 ppm, respectively. These results were within the safe limit. Radiological hazard parameters for indoor and outdoor (annual effective dose, excess lifetime cancer risk and effective dose rate to different body organs) were computed to assess the health risks associated with selected soil samples. The results of the study indicate that the levels of alpha-emitting radionuclides in the soil samples are below the recommended safety thresholds, suggesting that the surveyed area does not pose a radiological hazard. These findings offer important baseline data to support Iraqi public health initiatives and radon management strategies.</p>","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":" ","pages":"105-115"},"PeriodicalIF":1.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144954667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radiological assessment and potential health risks of naturally occurring radioactive materials in Kuakata Sea Beach sand: implications for rare-earth resources and nuclear fuel cycle feasibility.","authors":"M M Mahfuz Siraz, Musfik R Fahim, Mohammad Shafiqul Alam, Araf Mahmud, Md Bazlar Rashid, Mayeen Uddin Khandaker, Hamid Osman, Selina Yeasmin","doi":"10.1080/10256016.2025.2555952","DOIUrl":"10.1080/10256016.2025.2555952","url":null,"abstract":"<p><p>To assess the natural radioactivity levels and associated health risks in beach sand from Kuakata Sea Beach, this study performed a comprehensive radiological analysis of systematically collected sand samples using high-purity germanium (HPGe) γ-ray spectroscopy. The average (range) radioactivity levels of ²²⁶Ra, ²³²Th, and ⁴⁰K in the examined sand samples were 57 (37-105), 121 (76-231), and 210 (181-270) Bq kg^-1, respectively, thus markedly higher than the world average values of 30, 35, and 400 Bq kg^-1 for ²²⁶Ra, ²³²Th, and ⁴⁰K, respectively. The evaluation of different radiological risk parameters indicates values (maximum radium equivalent activity of 449.27 Bq kg^-1, maximum outdoor absorbed dose rate of 205.58 nGy h^-1, and maximum external hazard index of 1.21) much higher than the recommended levels, signifying that heavy minerals rich sands could pose a substantial health risk to individuals. The current findings have the potential to generate interest and exploration in rare-earth resources, particularly for their applications in the electronics industry, and thorium based nuclear fuel cycle resources for the next generation nuclear energy industry.</p>","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":" ","pages":"81-104"},"PeriodicalIF":1.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145185882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tracing and quantifying sulfur sources in karst watersheds through the stable isotope composition of dissolved sulfates.","authors":"Xuan Xiao, Ziyou Bai, Zhiwei Han, Pan Wu","doi":"10.1080/10256016.2025.2549051","DOIUrl":"10.1080/10256016.2025.2549051","url":null,"abstract":"<p><p>In karst ecosystems like the Gaoping River Basin (Zunyi, Guizhou Province, China), widespread evaporite deposits and exogenous acids inputs drive a shift in water chemistry from carbonate-dominated to sulfate-dominated regimes. Characterizing sulfate (<math><msubsup><mrow><mi>SO</mi></mrow><mn>4</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup></math>) sources and spatiotemporal dynamics is critical for managing vulnerable karst water resources. This study uses hydrochemistry, sulfur-oxygen <math><mo>(</mo><msup><mrow><mi>δ</mi></mrow><mrow><mn>34</mn></mrow></msup><msub><mrow><mi>S</mi></mrow><mrow><mrow><mi>S</mi></mrow><msub><mrow><mi>O</mi></mrow><mn>4</mn></msub></mrow></msub><mo>,</mo><mspace></mspace><msup><mrow><mi>δ</mi></mrow><mrow><mn>18</mn></mrow></msup><msub><mrow><mi>O</mi></mrow><mrow><mrow><mi>S</mi></mrow><msub><mrow><mi>O</mi></mrow><mn>4</mn></msub></mrow></msub><mo>)</mo></math>, and water (δD, <math><msup><mrow><mi>δ</mi></mrow><mrow><mn>18</mn></mrow></msup><msub><mrow><mi>O</mi></mrow><mrow><msub><mrow><mi>H</mi></mrow><mn>2</mn></msub><mrow><mi>O</mi></mrow></mrow></msub></math>) isotopes, combined with the SIAR model, to trace <math><msubsup><mrow><mi>SO</mi></mrow><mn>4</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup></math> sources across river reaches and hydrological seasons. Results show that sulfate in the Gaoping River originates from both natural and anthropogenic sources: In the upstream, water-rock interactions during groundwater (GW)-surface water (SW) recharge drive gypsum dissolution in carbonate formations, contributing 20.9-21.7 % of <math><msubsup><mrow><mi>SO</mi></mrow><mn>4</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup></math> in SW and 20.7-30.4 % in GW. In midstream, where agricultural land use dominates, soil-derived sulfate becomes the primary source, accounting for 23.3-25.8 % (SW) and 24.6-28.3 % (GW), correlated with land-use intensity. In downstream, intensive human activities (sewage discharge, fertilizer application) elevate anthropogenic inputs, with sewage contributing approximately 20.1 % to <math><msubsup><mrow><mi>SO</mi></mrow><mn>4</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup></math> loads in both SW and GW, and fertilizer inputs accounting for 24.0 %. The SIAR model confirms a transition from geogenic (gypsum, soil sulfate) to anthropogenic dominance downstream, with overall water chemistry shifting to a HCO₃·SO₄-Ca type, indicative of carbonate-to-sulfate evolution. These findings underscore the interplay between karst geology, land use, and hydrological processes in shaping sulfate budgets. The study provides a data-driven framework for targeted management: protecting upstream gypsum outcrops, optimizing midstream agricultural practices, and improving downstream wastewater treatment, thereby advancing sustainable karst water resource management in vulnerable ecosystems.</p>","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":" ","pages":"1-27"},"PeriodicalIF":1.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145368001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Contamination of commercial ¹⁵N₂: potential impacts on nitrogen fixation assays and a simple method for quantification.","authors":"Benjamin T Uveges, Kimberlee L Sparks, Warren S Ang, Hannah Monti, Fay-Wei Li, Jed P Sparks","doi":"10.1080/10256016.2026.2631699","DOIUrl":"https://doi.org/10.1080/10256016.2026.2631699","url":null,"abstract":"<p><p>Quantifying rates of nitrogen (N) fixation in complex biological systems is of specific and acute interest to a wide array of ecological, agricultural, and soil scientists. N-fixation assays are commonly achieved through incubation of the target system with N₂ gas that is greatly enriched in the less abundant heavy isotope, ¹⁵N. However, contamination of ¹⁵N₂ gas supplies with more biologically available N species, such as ammonia and nitrate/nitrite can profoundly interfere with such assays and lead to false positives and/or inflated estimates of N-fixation rates. Here, we identify the ongoing contamination of commercial ¹⁵N₂ stocks and quantify the potential impact to organismal and soil N-fixation studies. Further, we provide recommendations for mitigating and correcting for the effects of contamination in gas stocks, and present a simple, rapid procedure for quantification utilizing the same instrumentation that is typically employed to analyse N isotope ratios in N-fixation studies.</p>","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":" ","pages":"1-14"},"PeriodicalIF":1.4,"publicationDate":"2026-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147275677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of water vapor sources and water vapor recycle rate in northwest China based on the LMDZ model.","authors":"Tian Yin, Fenli Chen, Nan Kang, Huizhen Li, Xulin Li, Shiyu Wang","doi":"10.1080/10256016.2026.2630633","DOIUrl":"https://doi.org/10.1080/10256016.2026.2630633","url":null,"abstract":"<p><p>This study spatially interpolates isotope data from nine stations in northwest China based on the LMDZ (Laboratoire de Météorologie Dynamique-Zoom) model, analyzes the contribution of different water vapor sources to precipitation in the region through a ternary mixing model, and simulates the trajectory of air mass transport in the region by combining with the HYSPLIT model. The results show that δ¹⁸O and δ²H in precipitation in northwest China are impoverished in winter and enriched in summer, and Xi'an, Yan'an, and Lanzhou show the characteristics of low summer and high winter due to the influence of the southeast monsoon. Spatially, they are relatively impoverished in the mountainous regions and enriched in the oasis and desert regions. Shaanxi station (45.56 %), Yinchuan (36.05 %), and Lanzhou (24.7 %) are influenced by the southeast monsoon in summer, and the rest of the stations are mainly from westerly water vapor (Mediterranean Sea, Black Sea, and Caspian Sea, etc.). All the water vapor in winter originates from the westerly wind belt. The contribution of external water vapor is the largest, exceeding 70 % at most stations, followed by plant evapotranspiration water vapor with 0.4-39.3 %, and surface evapotranspiration water vapor with the smallest contribution of 0.1-2.2 %. In addition, the strength of westerly belt transport affected the isotopic enrichment of external water vapor, and vegetation cover significantly regulated the rate of water vapor recirculation. This study not only offers new insights into the application of isotope modeling techniques in hydrology and water resources, but also provides crucial reference for optimizing water resource management and allocation in this region.</p>","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":" ","pages":"1-18"},"PeriodicalIF":1.4,"publicationDate":"2026-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146226862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Health risk assessment of radon exposure through drinking water in Iluagba, Kogi State, Nigeria.","authors":"Ibrahim Ayodeji Bello, Abdullahi Muhammad Vatsa, Hameed Adavize Momoh, Taiwo Abadunmi, A A Bello","doi":"10.1080/10256016.2026.2615248","DOIUrl":"https://doi.org/10.1080/10256016.2026.2615248","url":null,"abstract":"<p><p>This study investigates radon concentrations in groundwater from 20 locations in Iluagba, Kogi State, Nigeria, analyzed using a liquid scintillation counter. Radon levels ranged from 10.6-43.1 Bq/L (average 24.1 Bq/L). Although below the World Health Organisation (WHO) limit of 100 Bq/L, about 90 % exceeded the United States Environmental Protection Agency (USEPA) advisory level of 11.1 Bq/L, indicating potential long-term health risks. The annual effective dose (AED) was highest in infants (up to 163.5 µSv/y), with seven samples exceeding the WHO reference dose of 100 µSv/y. Excess lifetime cancer risk (ELCR) values for all age groups surpassed the USEPA safety threshold (1.0 × 10^-⁴), identifying infants as the most vulnerable group. Organ-specific analysis showed the lungs received substantially higher doses than the stomach, confirming inhalation as the primary exposure route. While strong correlations (<i>r</i> ≈ 1.0) validated internal data consistency, the elevated radiological risk remains the key concern. Compared with other Nigerian regions, Iluagba exhibits moderate to high exposure levels. These findings underscore the need for targeted radon mitigation, community education, and routine groundwater monitoring to safeguard public health in Kogi State.</p>","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":" ","pages":"1-13"},"PeriodicalIF":1.4,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146142280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Alpha spectrometric analysis and environmental assessment of uranium concentrations in soil and vegetation from the Tafila District, Jordan.","authors":"Abdul-Wali Ajlouni, Kholoud Kharisat, Mahmoud Kulab, Ahmed Qwasmeh, Naima Amrani, Zinab Matar, Hana Almarri, Khaled Ali","doi":"10.1080/10256016.2026.2617939","DOIUrl":"https://doi.org/10.1080/10256016.2026.2617939","url":null,"abstract":"<p><p>This study aims to determine the specific activity of natural uranium isotopes, including uranium-238 (²³⁸U), uranium-234 (²³⁴U), and uranium-235 (²³⁵U), in soil and vegetable samples - specifically tomato, potato, onion, carrot, and radish - collected from the Tafila district, Jordan, and to assess the soil-to-plant transfer factors using alpha spectrometry with a passivated implanted planar silicon (PIPS) detector. A total of eight soil samples and eight corresponding vegetable samples were obtained from eight distinct locations. The results revealed considerable spatial variability in uranium activity concentrations, reflecting the influence of geological formations and environmental conditions. The average activity concentrations were 251.6 ± 14.2 Bq/kg for ²³⁸U, 10.5 ± 1.9 Bq/kg for ²³⁵U, and 248.8 ± 13.9 Bq/kg for ²³⁴U in soil samples, while vegetable samples showed lower concentrations of 3.2 ± 0.16, 0.21 ± 0.05, and 3.1 ± 0.17 Bq/kg for ²³⁸U, ²³⁵U, and ²³⁴U, respectively. The calculated transfer factors ranged from 4.4 ± 0.4 × 10^-3 to 29.1 ± 1.8 × 10^-3 for ²³⁸U, 6.4 ± 1.4 × 10^-3 to 33.0 ± 15.7 × 10^-3 for ²³⁵U, and 4.3 ± 0.4 × 10^-3 to 28.7 ± 1.9 × 10^-3 for ²³⁴U, which reflects notable differences in uranium uptake efficiency among the studied plant species. A strong correlation (<i>R</i>² = 0.99) was observed between ²³⁸U and ²³⁴U in both soil and vegetable samples, suggesting isotopic equilibrium through natural decay. These findings provide essential baseline data for future studies on uranium mobility, bioavailability, and potential radiological risks in agricultural systems within the Tafila District.</p>","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":" ","pages":"1-18"},"PeriodicalIF":1.4,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146142368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radiation hazards from ²²⁶Ra, ²³²Th and ⁴⁰K content in drinking waters of Islamabad, Pakistan.","authors":"Junaid Ahmed, Dimitrios Nikolopoulos, Aftab Alam, Muhammad Ali Shah, Waqar Ali Zafar, Georgios Priniotakis","doi":"10.1080/10256016.2026.2617297","DOIUrl":"https://doi.org/10.1080/10256016.2026.2617297","url":null,"abstract":"<p><p>This paper reports concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K in drinking waters from Islamabad, Pakistan. The aim is to estimate the radiological hazard risk and assess the radiation safety due to drinking water use. Radiation hazard indices and excess lifetime cancer risks are reported from all measurements. Different drinking water samples have been collected from Islamabad (33° 38'N, 73° 09'E) and analysed using a high purity germanium detector (HPGe). The average concentration values of ²²⁶Ra, ²³²Th and ⁴⁰K were 6 ± 0.6, 32 ± 1 and 74 ± 2 Bq L^-1, respectively. The radium equivalent activity was 58 Bq L^-1, the outdoor external dose was 0.2 nGy/h, the indoor external dose was 46 nGy/h and the total average annual dose was 0.2 nGy/h. The excess lifetime cancer risk was equal to 0.8 × 10^-3. All reported values are lower than the globally calculated values and within recommended limits.</p>","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":" ","pages":"1-13"},"PeriodicalIF":1.4,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146142406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of radioactivity in soil from the vicinity of Srikail gas field, Bangladesh: implications for public health and environment.","authors":"M M Mahfuz Siraz, Farhabi Mojib, Musfik Rahman Fahim, Mohammad Shafiqul Alam, Md Bazlar Rashid, Araf Mahmud, Hamid Osman, Mayeen Uddin Khandaker, Selina Yeasmin","doi":"10.1080/10256016.2025.2596044","DOIUrl":"https://doi.org/10.1080/10256016.2025.2596044","url":null,"abstract":"<p><p>This pioneering study investigates the levels of naturally occurring radioactive materials in soil collected from the vicinity of Srikail gas field, Bangladesh, utilizing a high purity germanium (HPGe) detector. Forty soil samples were systematically collected from concentric circles around the gas well, with approximate radii of 100, 200, 300, 400, and 500 m. The activity concentrations of ²²⁶Ra, ²³²Th, and ⁴⁰K ranged from 12-27, 24-45, and 255-480 Bq/kg, respectively, with most values aligning with global averages of 35, 35 and 400 Bq/kg respectively. Notably, two samples showed the presence of artificial radioactivity (¹³⁷Cs). All the radiological hazard indices are well within the recommended safety limits. However, this study emphasizes the need to establish baseline data for the soon-to-be-commissioned Rooppur Nuclear Power Plant and its nearby areas. It also highlights the importance of regular monitoring to detect any future changes in radioactivity levels that might come from natural processes or human activities.</p>","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":" ","pages":"1-22"},"PeriodicalIF":1.4,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145708041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Elephant range and population, strontium isotopes, and genetics combine to give local-scale specificity to ivory hotspot tracking.","authors":"Thure E Cerling, Jory C Lerback, Diego P Fernandez, Samuel K Wasser, Scott A Blumenthal, Thuan Chau, Lesley A Chesson, Cecelia Chisdock, Kendra L Chritz, Yves Hoareau, Zofia A Kaliszewska, Paula Kahumbu, Evan L Kipnis, Francis M Kirera, David K Korir, Mary K Kuhner, Tobias Odhacha, Julia V Tejada, Kevin T Uno, George Wittemyer","doi":"10.1080/10256016.2025.2596896","DOIUrl":"https://doi.org/10.1080/10256016.2025.2596896","url":null,"abstract":"<p><p>We use Sr isotopes to increase the precision of DNA-based origin estimates of wildlife products. Population information is used to develop Sr isotope Elephant Polygons that are overlaid onto the region of origin identified by DNA assignment to determine the sources of seized ivory samples. Our approach is cognizant of isotope mixing due to isotope turnover within animals and also of the large home range of elephants or other mobile species. Genetic information from 3 different law enforcement ivory seizures suggests a region of origin confined to Kenya and Tanzania in eastern Africa. We determine characteristic ⁸⁷Sr/⁸⁶Sr ratios for each of 25 different Elephant Polygons within this region using analyses of more the 600 known-origin reference samples. Using both the ⁸⁷Sr/⁸⁶Sr ratios of the seized ivory samples and elephant population estimates from individual Elephant Polygons we find that at least 75 % of the samples likely came from a single Elephant Polygon which includes the Tsavo National Parks in Kenya and the Mkomazi National Park in Tanzania. A few samples may have come from other regions, most likely from Tanzania. This study illustrates the value of combining genetics, isotope geochemistry, and population surveys in wildlife forensics studies.</p>","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":" ","pages":"1-19"},"PeriodicalIF":1.4,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145700934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}