Applied Radiation and Isotopes最新文献

{"title":"Impact of diorites and feldspars on soil radioactivity: Evidence from university city of the Universidad Nacional Mayor de San Marcos and the National Institute of Neoplastic Diseases","authors":"E.G. Villarreyes Peña , G. Patiño Camargo , P. Mendoza , O. Baltuano Elias","doi":"10.1016/j.apradiso.2025.111923","DOIUrl":"10.1016/j.apradiso.2025.111923","url":null,"abstract":"<div><div>This study represents the first systematic measurement of environmental radiation in the University City of the Universidad Nacional Mayor de San Marcos (UNMSM) and the National Institute of Neoplastic Diseases (INEN) in the city of Lima, Peru, conducted between July, December 2022, and January 2023. Natural radioactivity levels and absorbed dose rates in soil samples were determined by using gamma spectroscopy with a high purity germanium detector (HPGe) semiconductor detector with 150 % efficiency.</div><div>At UNMSM, the following results were obtained for the activity concentrations (A) of the four main naturally occurring radioactive materials NORM (<sup>238</sup>U, <sup>226</sup>Ra, <sup>232</sup>Th, and <sup>40</sup>K): <span><math><mrow><msub><mi>A</mi><mrow><mi>U</mi><mn>238</mn></mrow></msub><mo>=</mo><mn>24.2</mn><mo>±</mo><mn>3.4</mn><mspace></mspace><mi>B</mi><mi>q</mi><msup><mrow><mspace></mspace><mi>k</mi><mi>g</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></math></span>, <span><math><mrow><msub><mi>A</mi><mrow><mi>R</mi><mi>a</mi><mn>226</mn></mrow></msub><mo>=</mo><mn>28.8</mn><mo>±</mo><mn>0.7</mn><mspace></mspace><mi>B</mi><mi>q</mi><mspace></mspace><msup><mrow><mi>k</mi><mi>g</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></math></span>, <span><math><mrow><msub><mi>A</mi><mrow><mi>T</mi><mi>h</mi><mn>232</mn></mrow></msub><mo>=</mo><mn>39.4</mn><mo>±</mo><mn>1.2</mn><mspace></mspace><mi>B</mi><mi>q</mi><mspace></mspace><msup><mrow><mi>k</mi><mi>g</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></math></span> and <span><math><mrow><msub><mi>A</mi><mrow><mi>K</mi><mn>40</mn></mrow></msub><mo>=</mo><mn>539</mn><mo>±</mo><mn>7</mn><mspace></mspace><mi>B</mi><mi>q</mi><msup><mrow><mspace></mspace><mi>k</mi><mi>g</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></math></span>. We find the absorbed dose rate of <span><math><mrow><mn>57.5</mn><mspace></mspace><mi>n</mi><mi>G</mi><msup><mrow><mi>y</mi><mspace></mspace><mi>h</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></math></span> and an annual effective dose equivalent of <span><math><mrow><mn>0.28</mn><mspace></mspace><mi>m</mi><mi>S</mi><mi>v</mi><mspace></mspace><msup><mi>y</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></math></span>. On the other hand, at INEN, the following activity concentrations of NORM were found: <span><math><mrow><msub><mi>A</mi><mrow><mi>U</mi><mn>238</mn></mrow></msub><mo>=</mo><mn>26.0</mn><mo>±</mo><mn>3.4</mn><mspace></mspace><mi>B</mi><mi>q</mi><msup><mrow><mspace></mspace><mi>k</mi><mi>g</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></math></span>, <span><math><mrow><msub><mi>A</mi><mrow><mi>R</mi><mi>a</mi><mn>226</mn></mrow></msub><mo>=</mo><mn>27.9</mn><mo>±</mo><mn>0.8</mn><mspace></mspace><mi>B</mi><mi>q</mi><mspace></mspace><msup><mrow><mi>k</mi><mi>g</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></math></span>, <span><math><mrow><msub><mi>A</mi><mrow","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"224 ","pages":"Article 111923"},"PeriodicalIF":1.6,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of the application of the deformed dose summation (DDS) method in brachytherapy for advanced cervical cancer and analysis of regional dosing in recurrent cervical cancer","authors":"Hongling Xie ,&nbsp;Jiping Liu ,&nbsp;Long Sun ,&nbsp;Tieming Xie","doi":"10.1016/j.apradiso.2025.111945","DOIUrl":"10.1016/j.apradiso.2025.111945","url":null,"abstract":"<div><h3>Purpose</h3><div>This study evaluated the cumulative brachytherapy (BT) dose in cervical cancer using different methods and explored using deformed dose summation (DDS) techniques for assessing doses to targets and organs at risk (OAR).</div></div><div><h3>Methods</h3><div>A total of 41 patients with cervical cancer who underwent BT were retrospectively analyzed, the cumulative dose, measured as the equivalent dose in 2 Gy fractions, was calculated using dose–volume histogram (DVH) superposition and DDS methods. The dice similarity coefficient (DSC), Jaccard coefficient (JC), and mean distance to agreement (MDA) were utilized to evaluate the deformable image registration (DIR) accuracy. Furthermore, the difference between the target and OAR doses obtained through the two methods was calculated and compared. The Spearman method was employed to analyze dose differences and geometric correlations, comparing the dose in the relapsing area with that in the post-fusion high-risk clinical target volume (HR-CTV) in patients experiencing relapse to identify potential associations.</div></div><div><h3>Results</h3><div>In evaluating deformable registration, the registration outcomes for both the bladder and rectum were deemed satisfactory. The DSC, JC, and MDA values for the bladder and rectum were calculated as follows: 0.89 ± 0.07, 0.81 ± 0.09, 2.14 ± 1.44 mm and 0.80 ± 0.08, 0.67 ± 0.10, 2.28 ± 1.80 mm, respectively. Compared to DVH superposition, DDS techniques reduced the average cumulative doses of the D2cc and D0.1 cc of bladder by 11.4 % and 8.2 %, respectively; and the doses of the D2cc and D0.1 cc of rectum to be decreased by 9.7 % and 14.1 %, respectively. Additionally, the D90 of HR-CTV and Intermediate risk CTV (IR-CTV) were reduced by 6.60 ± 3.70 Gy and 4.55 ± 2.70 Gy, respectively. No significant correlation was observed between DSC, JC, and MDA and the dose difference. No correlation was observed between the relapsing regional dose and the dose parameters related to the HRCTV following fusion.</div></div><div><h3>Conclusions</h3><div>Calculating the cumulative dose using DVH parameters is a conservative approach that may limit target dose enhancement. During planning, DIR can guide clinicians in selecting the target dose and visually display the cumulative dose distribution in the cervical target area.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"224 ","pages":"Article 111945"},"PeriodicalIF":1.6,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144155101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of cadmium sulfide photoresistor and open-source software for X-ray detection in mammography","authors":"Pedro G.F.M. Paiva ,&nbsp;Vanessa M. Guimarães ,&nbsp;Cláudio D. de Almeida ,&nbsp;Josilene C. Santos","doi":"10.1016/j.apradiso.2025.111944","DOIUrl":"10.1016/j.apradiso.2025.111944","url":null,"abstract":"<div><div>The extensive use of ionizing radiation in several applications, specially X-rays in medicine, necessitates reliable detection systems for accurate measurement and control. The development of low-cost detectors is crucial to expanding access to these technologies. In this context, some approaches have been developed aiming to construct X-ray detection mechanisms utilizing cadmium sulfide (CdS), a photoconductive semiconductor, as a key material. This study investigates the feasibility of using a low-cost Light Dependent Resistor (LDR) sensor, made of CdS, integrated with a custom-made electronic system, for X-ray detection. The sensor was evaluated under various X-ray beam production parameters, such as tube voltage and exposure time, to assess its responsivity with both industrial and mammography X-ray devices. The detection system monitors variations in the electrical signal by detecting changes in the voltage drop across the LDR when exposed to X-rays. The results demonstrated a linear response at low voltages (up to 55 kVp) and an exponential response at higher voltages. Additionally, the system accurately measured exposure times, with deviations from the reference values of less than 2 %. Despite some experimental limitations, the detection system based on an LDR and Arduino has proven to be an effective tool and could contribute to the advancement of accessible radiation detection technologies.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"224 ","pages":"Article 111944"},"PeriodicalIF":1.6,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of occupational doses in surgical staff via Monte Carlo simulation","authors":"Karen L. Machado ,&nbsp;Alessa Maschio ,&nbsp;Guilherme B. Guimarães ,&nbsp;William S. Santos ,&nbsp;Lucio P. Neves ,&nbsp;Ana P. Perini","doi":"10.1016/j.apradiso.2025.111894","DOIUrl":"10.1016/j.apradiso.2025.111894","url":null,"abstract":"<div><div>This study evaluated radiation exposure during fluoroscopy-guided surgical procedures using Monte Carlo simulations. The methodology involved modeling femoral osteosynthesis scenarios, representing both the patient and the occupationally exposed individual (OEI) with a female reference phantom from ICRP Publication 145. The study included 24 simulations, categorized into posteroanterior (PA) and lateral cross (LC) projections, with tube voltages ranging from 60 to 90 kV for PA and 70 to 100 kV for LC. Protective equipment, such as aprons, suspended glass, and curtains, was tested using alternative materials to lead, including bismuth and tungsten. The results demonstrated that bismuth and tungsten exhibited varying levels of radiation attenuation efficiency compared to lead, with performance expressed as percentages relative to lead-based equipment. While certain scenarios showed that bismuth and tungsten outperformed lead in radiation protection, other scenarios highlighted their limitations. For instance, at 90 kV in the PA projection, both materials resulted in significant increases in radiation dose compared to lead.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"224 ","pages":"Article 111894"},"PeriodicalIF":1.6,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of a dose management system for occupationally exposed personnel based on python and MySQL: Implementation to the personal dosimetry laboratory of the Hospital de Especialidades Carlos Andrade Marín in Ecuador","authors":"Andy Rubio ,&nbsp;Yulmaris Zambrano","doi":"10.1016/j.apradiso.2025.111943","DOIUrl":"10.1016/j.apradiso.2025.111943","url":null,"abstract":"<div><div>This article presents the design and development of a dose management system for the generation of dosimetric reports of workers occupationally exposed to radiation from all medical units of the Ecuadorian Social Security (IESS). The system was programmed using free software, Python3, ensuring accessibility and sustainability, and uses MySQL as a database for the secure and efficient storage of dosimetric information. The system is aimed at replacing the manual system that had been implemented to guarantee traceability and facilitate the collection, processing and generation of accurate dosimetric reports of radiation exposure of occupationally exposed workers. Its implemen-tation will be carried out in the personal dosimetry laboratory of the Hospital de Especialidades Carlos Andrade Marín, which serves approximately 1,200 users who are provided with the dosimetry service for the whole body, extremities and lens. This system not only optimizes data management processes, but also contributes to compliance with national and international recommendations for improving the control and monitoring of occupational exposure to radiation, promoting a safer work environment for exposed workers.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"224 ","pages":"Article 111943"},"PeriodicalIF":1.6,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Neutron activation in interrupted neutron beams","authors":"Lauri Wendland,&nbsp;Liisa Porra,&nbsp;Tiina Seppälä,&nbsp;Mikko Tenhunen","doi":"10.1016/j.apradiso.2025.111896","DOIUrl":"10.1016/j.apradiso.2025.111896","url":null,"abstract":"<div><div>Neutron activation of activation targets in neutron beams with interruptions is studied. A simple and robust formalism for determining the number of activated atoms in neutron activation measurement despite beam interruptions is derived. Two simplified methods for correcting for the decay of produced nuclei in the activation target during beam interruptions are obtained and equations for using them are presented. The error of the simplifications done in the correction methods is quantified for Mn and Au activation targets and typical BNCT quality assurance measurement conditions. Upper limits on the duration of interruptions are established for keeping the impact of the simplifications on the total measurement uncertainty small when resuming irradiation after beam breaks. With these corrections methods and respecting the obtained upper limits on total pause duration, quality assurance neutron activation measurements in BNCT can be accomplished even if the neutron beam contains pauses, thus saving time from resetting the experimental setup each time an interruption occurs.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"225 ","pages":"Article 111896"},"PeriodicalIF":1.6,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144195411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of colour pigments on the thermoluminescence response of commercial cement under gamma radiation","authors":"R. Ajaj ,&nbsp;N.S. Mohd Nor Ihsan ,&nbsp;S.F. Abdul Sani ,&nbsp;Nur Nabila Abd Aziz ,&nbsp;Siti Nurasiah Mat Nawi ,&nbsp;Siti Norbaini Sabtu ,&nbsp;Zaenal Arifin ,&nbsp;D.A. Bradley","doi":"10.1016/j.apradiso.2025.111936","DOIUrl":"10.1016/j.apradiso.2025.111936","url":null,"abstract":"<div><div>This study explores the potential of five commercially available pigmented cements (green, yellow, blue, black, and maroon) as low-cost retrospective dosimeters by investigating their thermoluminescent (TL) response to gamma radiation (0–10 Gy). Notably, blue and yellow cements exhibited significantly higher TL intensities (38–82 %) compared to maroon, black, and green. A linear dose-response was observed up to 8 Gy (R² &gt; 0.98), with blue cement demonstrating the highest sensitivity (256.04 nC/Gy). Linearity index (f(D)) values indicated near-linear behavior for low to moderate doses, with supralinearity observed at higher exposures. TL fading followed an exponential decay, with blue cement retaining ∼76 % of its signal after 30 days. Kinetic parameters, including activation energy (E), frequency factor (s), and lifetime (τ), were determined using the peak shape method, revealing variations in trap depths and recombination mechanisms across the different cements. EDX analysis of blue cement identified key elemental constituents (Ca, Si, Al, Fe) and trace metals that influence TL trapping mechanisms. These findings strongly suggest the viability of pigmented cements for retrospective dosimetry, warranting further research into trap kinetics and spectral emissions.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"224 ","pages":"Article 111936"},"PeriodicalIF":1.6,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Patient assistance protocol based on continuous dose monitoring in interventional cardiological procedures","authors":"Patrícia Lopes Barbosa ,&nbsp;Adriano Henrique Pereira Barbosa ,&nbsp;Marcos Cesar Florian ,&nbsp;Pedro Memrava Romanini ,&nbsp;Heiglon Estevão Bonella Denti ,&nbsp;Regina Bitelli Medeiros","doi":"10.1016/j.apradiso.2025.111925","DOIUrl":"10.1016/j.apradiso.2025.111925","url":null,"abstract":"<div><div>Our purpose is to present a monitoring protocol designed to assist patients who received radiation doses with skin damage potential based on a database collected from 2018 to 2022. This database allowed these patients to be identified and also enabled the staff to become aware of diagnostic reference level (DRL). The patients' follow-up was established when Substantial Radiation Dose Level (SRDL) was registered at the end of the exam in which cumulative air kerma values are equal to or greater than 5 Gy or area-air kerma product (PKA) ≥500 Gy.cm2 or fluoroscopy time ≥60 min. Among sample of 10,176 performed procedures including diagnostic (65–72 % CA), percutaneous coronary interventions (12–15 % PCI) and CA followed by PCI (13–21 % ad hoc angioplasty), 51 patients were identified as having received SRDL (0.52 % of procedures) and classified as overweight or obese. Continuous monitoring of these patients has been carried out through face-to-face appointments or by photos of irradiated skin region. Contact with each patient has been maintained and whenever a lesion is identified, the patient is referred to the dermatology department for treatment. Among the 53 procedures identified, 42 patients are under active follow-up (3 patients underwent 2 procedures, 6 died due to heart disease and 2 haven't answered calls). 8 patients who presented some degree of skin injury, being 3 females, were referred to the dermatology team for evaluation and have been kept under clinical follow-up. It is possible to maintain active patient monitoring, offering them assistance and encouraging the staff to optimize radiological protection.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"224 ","pages":"Article 111925"},"PeriodicalIF":1.6,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Examining the effect of scatter radiation spread in LaCl3:Ce and LaBr3:Ce scintillators under nuclear medicine imaging exposure conditions","authors":"Ilias Anagnostou ,&nbsp;Christos Michail ,&nbsp;Stavros Tseremoglou ,&nbsp;Ioannis Valais ,&nbsp;Konstantinos Ninos ,&nbsp;George Saatsakis ,&nbsp;Athanasios Bakas ,&nbsp;George Fountos ,&nbsp;Ioannis Kandarakis ,&nbsp;Nektarios Kalyvas","doi":"10.1016/j.apradiso.2025.111924","DOIUrl":"10.1016/j.apradiso.2025.111924","url":null,"abstract":"<div><div>Crystalline scintillator materials are used as part of a radiation detection system. Their high atomic number and their efficiency in converting ionizing radiation to optical photons increase the sensitivity of the detector. An important application of crystalline scintillators is in nuclear medicine imaging detectors. In such equipment scatter radiation spread may affect the signal in areas lateral to the initial interaction site, resulting in image degradation. Recently LaCl₃:Ce and LaBr₃:Ce scintillators have been studied as candidates for a hybrid SPECT/CT detector system. The scope of this work is to theoretically examine the scatter radiation of LaCl₃:Ce and LaBr₃:Ce scintillators for nuclear medicine imaging applications, through Monte Carlo simulations. It was found that the higher the thickness of the scintillator the higher the scatter component near its exit, although no significant values were calculated for distances further than that from the central axis point of the scintillator. The highest values were calculated for LaBr₃:Ce under 140 keV irradiation conditions.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"224 ","pages":"Article 111924"},"PeriodicalIF":1.6,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fast determination of 90Sr in urine samples and internal dose evaluation in emergency situations","authors":"D. Arginelli ,&nbsp;M.C. Botta ,&nbsp;S. Ridone ,&nbsp;S. Zicari ,&nbsp;P. Battisti","doi":"10.1016/j.apradiso.2025.111922","DOIUrl":"10.1016/j.apradiso.2025.111922","url":null,"abstract":"<div><div>During nuclear or radiological emergency, it is important to rapidly identify contaminated people to administer them necessary treatments as soon as possible. A simple method to project and adapt measurement techniques for a mass monitoring of internal contamination based on the concept of “minimum detectable dose” has been developed. This method has been applied to ⁹⁰Sr, as it has a specific significance for spread in anthropic activity and radiotoxicity, so to require a fast, precise and suitable technique for its determination in many biological samples. A chromatographic separation allowed to isolate and measure by gas proportional counting ⁹⁰Sr excreted into urine and to calculate the correspondent intake and committed effective dose within half a day, taking also into account an overestimation of 10 % of total activity due to ⁹⁰Y not eliminated or formed during the measurement. The capacity to attribute values of committed effective dose lower than the precautionary reference level of 10 mSv, which is generally considered safe and does not typically cause health observable effects, has proved the method efficacy, even for a sample collection range larger than 20 days from the intake and for the most dangerous Type S of the investigated radionuclide.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"224 ","pages":"Article 111922"},"PeriodicalIF":1.6,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144114863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}