Radiation Measurements最新文献_第4页

Study of thermoluminescence characteristics of quartz for high radiation doses (>1kGy): Implications for extending the luminescence dating range 高辐射剂量（>1kGy）石英热发光特性研究：对扩大发光测年范围的影响

IF 1.6 3区物理与天体物理

Radiation Measurements Pub Date : 2024-09-18 DOI: 10.1016/j.radmeas.2024.107300

Malika Singhal , Madhusmita Panda , S.H. Shinde , Sandip Mondal , O. Annalakshmi , Naveen Chauhan

{"title":"Study of thermoluminescence characteristics of quartz for high radiation doses (>1kGy): Implications for extending the luminescence dating range","authors":"Malika Singhal , Madhusmita Panda , S.H. Shinde , Sandip Mondal , O. Annalakshmi , Naveen Chauhan","doi":"10.1016/j.radmeas.2024.107300","DOIUrl":"10.1016/j.radmeas.2024.107300","url":null,"abstract":"<div><div>Quartz is an omnipresent abundant natural mineral, used for luminescence dating. Lately, quartz optically stimulated luminescence (OSL) technique is widely used to estimate the equivalent doses (De) for dating geological events (up to 250 Gy, limited by saturation). Some works report thermoluminescence (TL) saturation around ∼ (10–40) kGy. Still dose estimates for such high radiation dose (HRD) range are not achieved. Significant research exists about luminescence response for low dose ranges (<250 Gy) but limited studies are done for HRDs (>1 kGy). This work characterizes the luminescence response of quartz for HRDs (1–21 kGy) to improve existing understanding of luminescence mechanism. Results show that the characteristics of the trap (<200 °C) differ significantly at HRDs than low doses. TL in multi-spectral detection (UV–Visible) band suggest an increase in 340–380 °C peak intensity up to 11 kGy dose. The measurements of saturation dose suggest that it depends on the trapping centres but is independent of recombination centres for the samples used for study. The traps are found bleachable by sunlight, reducing TL signal to residual levels in 1 h. Further, the bleachability is found to be anti-correlated with luminescence emission wavelength. At HRDs luminescence sensitivity is influenced by dose given in previous cycle which is difficult to correct by routine normalization procedures. The work also explores the various normalization methods to find appropriate method for HRD estimation and recommends the use of mass normalization as other normalization methods do not correct the sensitivity changes at HRDs adequately.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"178 ","pages":"Article 107300"},"PeriodicalIF":1.6,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microdosimetry for BNCT: First measurements at different site sizes 用于 BNCT 的显微模拟技术：不同部位尺寸的首次测量

IF 1.6 3区物理与天体物理

Radiation Measurements Pub Date : 2024-09-14 DOI: 10.1016/j.radmeas.2024.107298

A. Selva, A. Bianchi, L. Bellan, E. Fagotti, A. Pisent, V. Conte

{"title":"Microdosimetry for BNCT: First measurements at different site sizes","authors":"A. Selva, A. Bianchi, L. Bellan, E. Fagotti, A. Pisent, V. Conte","doi":"10.1016/j.radmeas.2024.107298","DOIUrl":"10.1016/j.radmeas.2024.107298","url":null,"abstract":"<div>Microdosimetric techniques are a valuable tool for beam quality monitoring in BNCT, due to their capability to distinguish different contributions to the total dose and provide physics-based quantities related to biological effectiveness of this composite radiation field. To this aim, measurements are generally performed with gas detectors simulating a tissue-equivalent site size between 0.5 and 2 μm. This work presents instead measurements for site sizes up to 10 μm, performed in the thermal neutron field produced by the accelerator-based MUNES source available at INFN-LNL. An avalanche-confinement TEPC with boron doping in the cathode walls was used. Photon and neutron dose fractions were discriminated in the measured dose-weighted distributions based on their different lineal energy range. In the neutron component two separate peaks could be distinguished for site sizes of 5 μm and greater, the origin of which was tentatively related to contributions due to protons and alpha particles. These results allow to assess the impact of increasing site diameter on the measured relative dose contributions and provide valuable reference data for biological modelling and for comparison with solid-state microdosimeters.</div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"178 ","pages":"Article 107298"},"PeriodicalIF":1.6,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1350448724002464/pdfft?md5=535643b76f5e2020bc1cf807d6b27be3&pid=1-s2.0-S1350448724002464-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142242935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Use of a Machine Learning based method to detect anomalous Thermoluminescence Glow Curves (TL-GC) in routine Dosimetry Services 在常规剂量测定服务中使用基于机器学习的方法检测异常热释光辉光曲线 (TL-GC)

IF 1.6 3区物理与天体物理

Radiation Measurements Pub Date : 2024-09-10 DOI: 10.1016/j.radmeas.2024.107293

O. Arquero , J. Berenguer-Antequera , J.F. Benavente

引用次数: 0

Thermoluminescence properties of β-ray irradiated LuAGG:Ce nanophosphors prepared by sol-gel method for potential applications in dosimetry 溶胶-凝胶法制备的 β 射线辐照 LuAGG:Ce 纳米磷的热致发光特性在剂量测定中的潜在应用

IF 1.6 3区物理与天体物理

Radiation Measurements Pub Date : 2024-09-10 DOI: 10.1016/j.radmeas.2024.107296

S. Saadi , D.E. Kdib , A. Boukerika , R. Berreksi , A. Bentabet , S. Mahtout , Z. L Mokrani

{"title":"Thermoluminescence properties of β-ray irradiated LuAGG:Ce nanophosphors prepared by sol-gel method for potential applications in dosimetry","authors":"S. Saadi , D.E. Kdib , A. Boukerika , R. Berreksi , A. Bentabet , S. Mahtout , Z. L Mokrani","doi":"10.1016/j.radmeas.2024.107296","DOIUrl":"10.1016/j.radmeas.2024.107296","url":null,"abstract":"<div>In this paper, Lu2.97Al5–xGaxO12:Ce0.03 (x = 0, 1, 2, 3) nanophosphors were synthesized using sol-gel method and calcined at 1100 °C for 3 h. The effect of Ga content on the structural, photoluminescence (PL), and notably thermoluminescence (TL) glow curve, dose response, repeatability and fading properties were investigated. X-ray diffraction (XRD) results indicated that all synthesized samples were crystallized in a pure garnet phase. The PL emission spectra exhibited a broad emission band corresponding to the 5 d → 4f (2F5/2, 2F7/2) transition of Ce3+ ions in the garnet lattice. Furthermore, a significant decrease in emission intensity was observed upon increasing Ga content. The TL characteristics of nanopowders irradiated with β-rays revealed a significant effect of Ga content on the peak position, shape and intensities of TL Glow curves, which can be explained by the reduction of the energy gap and the distribution of trap levels. The dose response linearity in the range of 0.125–100 Gy was examined for different Ga content, revealing a good linear behavior for x = 0 and 1 Ga. Additionally, samples prepared with x = 0, 1, and 2 Ga exhibited a high level of repeatability across a batch of 10 samples. Also, fading studies were performed for 128 h and revealed strong fading in samples synthesized with x = 0 and 1 Ga. These results suggest potential applications of Lu3Al5O12:Ce and Lu3Al4Ga1O12:Ce in ionizing radiation dosimetry.</div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"178 ","pages":"Article 107296"},"PeriodicalIF":1.6,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142166772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Significance and feasibility of air kerma length product and air kerma area product comparisons 空气气膜长度乘积和空气气膜面积乘积比较的意义和可行性

IF 1.6 3区物理与天体物理

Radiation Measurements Pub Date : 2024-09-10 DOI: 10.1016/j.radmeas.2024.107291

Miloš Živanović , Maja Vojnić Kortmiš , Nikola Kržanović , Miloš Đaletić , Ivana Komatina

{"title":"Significance and feasibility of air kerma length product and air kerma area product comparisons","authors":"Miloš Živanović , Maja Vojnić Kortmiš , Nikola Kržanović , Miloš Đaletić , Ivana Komatina","doi":"10.1016/j.radmeas.2024.107291","DOIUrl":"10.1016/j.radmeas.2024.107291","url":null,"abstract":"<div>Air kerma length product and air kerma area product are special quantities used in diagnostic radiology. They are measured using special measurement devices – CT-chambers and KAP-meters, in order to calculate quantities related to patient exposure. Appropriate calibration of all measurement devices is of vital importance, and comparisons between calibration laboratories are necessary to prove competence.It is usually considered adequate to participate in air kerma comparisons to prove capabilities for special quantities, but the literature shows that some problems in calibration procedure can remain unknown. The comparisons directly in terms of special quantities provide additional burden to laboratories, and require special transfer instruments, but they allow checking the whole calibration procedures.This paper describes a comparison between two calibration laboratories in terms of both air kerma length product and air kerma area product. Both laboratories achieved good results for all radiation qualities, considering the measurement uncertainty. Transfer instruments’ linearity, field size dependence and energy dependence were investigated. Even though the metrological properties of the transfer instruments are worse than the ionization chambers, they can be taken into account by introducing additional measurement uncertainty, performing appropriate corrections or choosing calibration points for the comparison for the values of influence quantities where the transfer instrument response is relatively flat. These comparisons provide additional value to calibration laboratories, but there are still several challenges related to their organization and execution.</div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"178 ","pages":"Article 107291"},"PeriodicalIF":1.6,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142166771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

International intercomparison and quality assessment of passive and active 222Rn measuring devices in the Asia-Pacific region 亚太地区无源和有源 222Rn 测量装置的国际互比和质量评估

IF 1.6 3区物理与天体物理

Radiation Measurements Pub Date : 2024-09-10 DOI: 10.1016/j.radmeas.2024.107295

N. Karunakara , A.P. Vijith , Rosaline Mishra , B.K. Sahoo , Miroslaw Janik , Sudeep Kumara , B.K. Sapra , Shinji Tokonami , Chutima Kranrod , S. Chandrasekaran , N. Chitra , Seon hong Kim , Juhee Yoo , Chao Zhao , Bo Chen , Hong-Gi Kim , Jin-il Kim , Josef Holecek , Le Dinh Cuong

{"title":"International intercomparison and quality assessment of passive and active 222Rn measuring devices in the Asia-Pacific region","authors":"N. Karunakara , A.P. Vijith , Rosaline Mishra , B.K. Sahoo , Miroslaw Janik , Sudeep Kumara , B.K. Sapra , Shinji Tokonami , Chutima Kranrod , S. Chandrasekaran , N. Chitra , Seon hong Kim , Juhee Yoo , Chao Zhao , Bo Chen , Hong-Gi Kim , Jin-il Kim , Josef Holecek , Le Dinh Cuong","doi":"10.1016/j.radmeas.2024.107295","DOIUrl":"10.1016/j.radmeas.2024.107295","url":null,"abstract":"<div>Intercomparison exercise is an integral part of the quality assurance programmes in 222Rn measurements using active and passive devices. Ensuring the accuracy of data generated through measurements necessitates periodic performance checks. To achieve harmonization of methods, quantify biases and errors in measurements, and identify the reasons for discrepancies, there is a pressing need for periodic intercomparison exercises. To address this need of numerous laboratories, particularly in the Asia-Pacific region, a calibration facility for 222Rn measuring devices has been established at the Centre for Advanced Research in Environmental Radioactivity (CARER), Mangalore University, India. An international intercomparison exercise for the 222Rn measuring devices was conducted at this facility in the year 2022 with the participation of 10 laboratories from six countries. A total of 354 devices (comprising of both active and passive detectors) were subjected to intercomparison measurements by exposing them to three concentration levels: (5.97 ± 0.29) × 103 Bq m−3, (0.70 ± 0.09) × 103 Bq m−3 and (2.02 ± 0.20) × 103 Bq m−3 in separate experiments and the exposure durations were 7 days, 15 days, and 10 days respectively. The performance of each laboratory was evaluated following the criterion adopted by the International Atomic Energy Agency (IAEA) in its worldwide proficiency test programmes. This exercise brought out the fact that some of the laboratories need to improve their measurement practices to produce reliable data.</div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"178 ","pages":"Article 107295"},"PeriodicalIF":1.6,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the effects of preparation processes on OSL and TL properties of NaMgF3:Dy,Eu 制备工艺对 NaMgF3:Dy,Eu 的光致发光（OSL）和热致发光（TL）特性的影响研究

IF 1.6 3区物理与天体物理

Radiation Measurements Pub Date : 2024-09-10 DOI: 10.1016/j.radmeas.2024.107297

Siyuan Zhang, Kaiyong Tang, Li Fu, Mo Zhou, Haijun Fan, Yan Zeng, Zhiyuan Li

{"title":"Study on the effects of preparation processes on OSL and TL properties of NaMgF3:Dy,Eu","authors":"Siyuan Zhang, Kaiyong Tang, Li Fu, Mo Zhou, Haijun Fan, Yan Zeng, Zhiyuan Li","doi":"10.1016/j.radmeas.2024.107297","DOIUrl":"10.1016/j.radmeas.2024.107297","url":null,"abstract":"<div>OSL fading with storage time after irradiation remains a major obstacle in the development of ideal OSL materials. Dy and Eu co-doped NaMgF3 are attractive candidates for various rare earth doped matrix materials. In this study, NaMgF3:Dy,Eu was synthesized by a solid-state reaction, and the effects of heating temperature, duration, atmosphere, and cooling rate on XRD, TL and OSL properties were studied. A simple, safe, efficient, and time-saving solid-state reaction was identified as a potential method for the preparation of NaMgF3:Dy,Eu, which could be optimally prepared by heating at 750 °C for 2 h under nitrogen atmosphere (2 l/min) followed by rapid cooling. The results show that NaMgF3:Dy,Eu has a more stable OSL response and an excellent TL glow curve, with only a 0.4% decrease in the OSL signal read after 1 d of dose irradiation compared to that immediately after irradiation, and a high main TL peak at ∼320 °C. It has been indicated the OSL signal in this material seems to be strongly related to the main TL peak. The material has a considerable OSL sensitivity and decay rate than the Luxel Detector. NaMgF3:Dy,Eu will have a promising future in the field of OSL dosimetry due to its near tissue equivalence, low OSL fading without preheating, fast OSL decay rate, and predictable and easily reusable dose elimination.</div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"178 ","pages":"Article 107297"},"PeriodicalIF":1.6,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142229640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterization of neutron spectrum of polyethylene-moderated AmBe neutron source using a passive single-cylindrical neutron spectrometer 使用被动式单圆柱中子能谱仪确定聚乙烯慢化 AmBe 中子源的中子能谱特征

IF 1.6 3区物理与天体物理

Radiation Measurements Pub Date : 2024-09-07 DOI: 10.1016/j.radmeas.2024.107294

Rasito Tursinah , Sidik Permana , Zaki Su'ud , Alan Maulana , Tri C. Laksono , Afida Ikawati , Satrio A. Setiawan , Wahyudi Wahyudi , Bunawas Bunawas

{"title":"Characterization of neutron spectrum of polyethylene-moderated AmBe neutron source using a passive single-cylindrical neutron spectrometer","authors":"Rasito Tursinah , Sidik Permana , Zaki Su'ud , Alan Maulana , Tri C. Laksono , Afida Ikawati , Satrio A. Setiawan , Wahyudi Wahyudi , Bunawas Bunawas","doi":"10.1016/j.radmeas.2024.107294","DOIUrl":"10.1016/j.radmeas.2024.107294","url":null,"abstract":"<div>The changes in the neutron spectrum produced by the AmBe neutron source moderated in the polyethylene sphere need to be characterized. A passive single-moderator neutron spectrometer with indium foil activation neutron detector has been developed to characterize the neutron spectrum of an AmBe source inside a polyethylene sphere. The detector response function was calculated using the MCNPX 2.7 program with IRDFF-II nuclear data library. Measurements were conducted by placing the Single-Cylindrical Neutron Spectrometer (SCNS) on the outer surface of the sphere for 5 h. The 116mIn activity due to neutron activation in each indium foil was measured using a gamma spectrometer with an HPGe detector. By identifying the count value at the peak energy of 1294 KeV and considering an HPGe detector efficiency of 3.2% at the foil position 1 mm above the detector surface, the activity of 116mIn was obtained. The activity value of 116mIn from each indium foil was compared with the MCNPX simulation results. The neutron spectrum was unfolded using the UMG 3.3 program with activity data input of 116mIn for each foil and detector response. A neutron spectrum was obtained with a total neutron flux of 634 ± 60 n/cm2·s, consisting of 25% thermal neutrons, 16% epithermal neutrons, and 61% fast neutrons. When compared with the simulation results, the total neutron flux in the spectrum produced by SCNS-In showed only a small difference of 1%. Based on these neutron spectrum measurements, it was determined that placing the AmBe neutron source inside a 15″ diameter PE-sphere will reduce the fast neutron flux by 78%.</div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"178 ","pages":"Article 107294"},"PeriodicalIF":1.6,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142157628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A review of criticality dosimetry at the Y-12 National Security Complex and practical importance of dose accuracy in emergency response 审查 Y-12 国家安全综合体的临界剂量测定以及剂量准确性在应急响应中的实际重要性

IF 1.6 3区物理与天体物理

Radiation Measurements Pub Date : 2024-09-07 DOI: 10.1016/j.radmeas.2024.107292

A.E. Detweiler , J.M. Hayes , K.J. McMahon , K.G. Veinot

{"title":"A review of criticality dosimetry at the Y-12 National Security Complex and practical importance of dose accuracy in emergency response","authors":"A.E. Detweiler , J.M. Hayes , K.J. McMahon , K.G. Veinot","doi":"10.1016/j.radmeas.2024.107292","DOIUrl":"10.1016/j.radmeas.2024.107292","url":null,"abstract":"<div>A nuclear criticality results in the emission of both neutron and gamma radiation and can produce doses to personnel near the event that exceed 0.1 Gy (10 rad). The primary purpose of nuclear accident dosimetry is to rapidly identify affected personnel in need of prompt medical treatment and to reassure personnel who have been only minimally exposed. While accurate dosimetry is desired, it must be recognized that dose determinations made from whole-body dosimeters or simple triage methods are very rough estimates and contain significant uncertainties. Even when accounting for factors like varying neutron energy spectra, mean photon energies, body orientation within the radiation field, and transient effects on dosimeter response, etc., the end value is a dosimetric quantity defined for very specific radiological conditions and determined within a simple phantom usually at a single depth. Of more importance is the biological response to the radiation, which will vary by person and can be affected by the individual's radiation sensitivity, age, gender, mass, and underlying health conditions. The overall biological, person-specific response to a given dose cannot be precisely determined except by patient symptom observation and individual biological dosimetry (e.g. chromosome analysis, lymphocyte ratios, etc.). This work describes and discusses the criticality accident dosimetry program at the Y-12 National Security Complex, a United States Department of Energy National Nuclear Security Administration facility. The primary goals of the Y-12 accident dosimetry program are, among others, the rapid identification of significantly exposed persons, prompt routing of exposed workers for medical evaluation and treatment, and the ultimate processing of dosimeters to assign doses to personnel.</div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"178 ","pages":"Article 107292"},"PeriodicalIF":1.6,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142173009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In vivo measurements in pediatric computed tomography with TLD: A correlation between CDTIvol values 使用 TLD 进行儿科计算机断层扫描的活体测量：CDTIvol 值之间的相关性

IF 1.6 3区物理与天体物理

Radiation Measurements Pub Date : 2024-09-01 DOI: 10.1016/j.radmeas.2024.107275

Alexsandro Guimarães , Felipe Borges , Carlos Ubeda , Cassiana Viccari , Carmen Sandra Guzmán Calcina , Thatiane Pianoschi , Mirko Salomón Alva-Sánchez

{"title":"In vivo measurements in pediatric computed tomography with TLD: A correlation between CDTIvol values","authors":"Alexsandro Guimarães , Felipe Borges , Carlos Ubeda , Cassiana Viccari , Carmen Sandra Guzmán Calcina , Thatiane Pianoschi , Mirko Salomón Alva-Sánchez","doi":"10.1016/j.radmeas.2024.107275","DOIUrl":"10.1016/j.radmeas.2024.107275","url":null,"abstract":"<div>This study investigates pediatric Computed Tomography (CT) dosimetry, specifically in the thoracic and head regions, using thermoluminescent dosimeters (TLD). The investigation, conducted at the Imaging Diagnostic Center of the Dom Vicente Scherer Hospital, involved two CT machines, the GE Optima 540 and Revolution EVO models. It aims to correlate in vivo TLD analysis with experimental CT Dose Index Volume (CTDIvol) values. The research reveals a maximum variation between machine-indicated CTDI values of 5.7% for the Optima 540 model and 6.8% for the Revolution EVO model at a voltage of 120 kV. Comparison with dose reference levels (DRL) from the United Kingdom and the United States indicates that the obtained values are below these standards, suggesting safe practices in the participating hospital. However, a larger sample size is recommended to establish local standards securely. In the thoracic region, nominal CTDIvol values indicate measurements around 150% lower than the dose values measured by TLD's, however, no correlation was found between the two variables (p-value = 0.09). In the head, nominal CTDIvol values varied on average 21% above the doses measured by TDL's, showing a strong correlation between the two quantities (p-value = 0.0002). The study highlights the importance of cautious interpretation of the CTDIvol and the need for continuous optimization of procedures to ensure safe practices and minimize the risks of radiation exposure in pediatric patients.</div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"177 ","pages":"Article 107275"},"PeriodicalIF":1.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142098969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0