Radiation protection dosimetry最新文献_第6页

Determination of the ambient dose equivalent H*(10) at high-altitude cities using a NaI(Tl) scintillator. 使用 NaI（Tl）闪烁体测定高海拔城市的环境剂量当量 H*（10）。

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-12-06 DOI: 10.1093/rpd/ncae209

Carlos Lorenzo Nina Choque, Hugo Marcelo Rivera Bretel

{"title":"Determination of the ambient dose equivalent H*(10) at high-altitude cities using a NaI(Tl) scintillator.","authors":"Carlos Lorenzo Nina Choque, Hugo Marcelo Rivera Bretel","doi":"10.1093/rpd/ncae209","DOIUrl":"10.1093/rpd/ncae209","url":null,"abstract":"The ambient dose equivalent rate H*(10) was determined at various locations in the metropolitan area of the cities of La Paz and El Alto in Bolivia. A NaI(Tl) scintillation detector was employed to infer the gamma-ray fluence, and the fluence was transformed in dose rates by means of the appropriate coefficients. In this paper, a full methodology for the estimation of dose rates associated with gamma rays emitted from the ground (terrestrial radiation) and the atmosphere is developed from measurements made with the scintillator instrument. The energy calibration and resolution of the apparatus are presented, followed by the estimation of its response and efficiency by means of Monte Carlo simulations. Lastly, the definition of H*(10) is used to determine the conversion coefficients needed to transform gamma-ray fluence in dose rates. With this methodology, rates for H*(10) around 123 ± 8 nSv/h were estimated using data collected in three city districts: Mallasa (3320 m a.s.l.), San Antonio (3620 m a.s.l.), and Zona Sur (3400 m a.s.l.). The dose rates are believed to be representative of the terrestrial radiation fields encountered in the highlands of Bolivia.","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"1990-1996"},"PeriodicalIF":0.8,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142506723","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}

引用次数: 0

Radiation dose assessment of pediatric computed tomography of the chest: the need to consider patient size. 小儿胸部计算机断层扫描的辐射剂量评估：需要考虑患者体型。

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-12-06 DOI: 10.1093/rpd/ncae212

Vanessa Döwich, Felipe Soares Torres, Andressa Lima Nietto, Vitor Silva Timm, Maurício Anés, Alexandre Bacelar, Paulo José Cauduro Maróstica

{"title":"Radiation dose assessment of pediatric computed tomography of the chest: the need to consider patient size.","authors":"Vanessa Döwich, Felipe Soares Torres, Andressa Lima Nietto, Vitor Silva Timm, Maurício Anés, Alexandre Bacelar, Paulo José Cauduro Maróstica","doi":"10.1093/rpd/ncae212","DOIUrl":"10.1093/rpd/ncae212","url":null,"abstract":"Objective: To evaluate the radiation dose of chest computed tomography (CT) examinations of pediatric patients and the extent to which volume CT dose index (CTDIvol) underestimates radiation dose in comparison to size specific dose estimates (SSDE).Methods: Single-center, retrospective study of consecutive unenhanced pediatric (age <18 years) chest CTs between October 2015 and October 2016. Radiation dose as well as demographic and clinical data were recorded from 133 chest CTs. Patients were grouped into 4 categories based on mean effective diameter of the chest. SSDE was generated for each patient according to the water equivalent and effective diameter and compared to CTDIvol. Factors associated with higher radiation doses were assessed.Results: CTDIvol underestimated radiation dose by 54.7%, 47.6%, 40.2%, and 31.2% (P < .001) for effective diameter groups 1 to 4, respectively, when compared to SSDE (calculated according to the water equivalent). When calculated according to the effective diameter, CTDIvol underestimated radiation dose by 47.6%, 39.4%, 27%, and 12.3% (P < .001) for effective diameter groups 1 to 4, respectively, when compared to SSDE. CT dose parameters, age, weight, Dw, and mean effective diameter were variables associated with higher radiation doses.Conclusion: CTDIvol systematically underestimated radiation dose in comparison to SSDE in pediatric patients submitted to chest CT and should not be used as the primary parameter to monitor CT protocols in these patients. SSDE calculated according to effective diameter also underestimates the radiation dose compared to SSDE calculated based on water equivalent.","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"2008-2013"},"PeriodicalIF":0.8,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142606034","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}

引用次数: 0

Energy response of CaSO4:Dy thermoluminescence detector to medical linear accelerator photon beams. CaSO4:Dy 热释光探测器对医用直线加速器光子束的能量响应。

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-12-06 DOI: 10.1093/rpd/ncae211

Sri Herwiningsih, Lia Wilda Izzati, Bunawas Bunawas

引用次数: 0

Determination of natural radioactivity levels in soil samples from irrigated vegetable farming land in and around Addis Ababa, Ethiopia. 测定埃塞俄比亚亚的斯亚贝巴及其周边地区灌溉菜地土壤样本中的天然放射性水平。

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-12-06 DOI: 10.1093/rpd/ncae203

Tamiru Bayissa Hundie, Tilahun Tesfaye Deressu

{"title":"Determination of natural radioactivity levels in soil samples from irrigated vegetable farming land in and around Addis Ababa, Ethiopia.","authors":"Tamiru Bayissa Hundie, Tilahun Tesfaye Deressu","doi":"10.1093/rpd/ncae203","DOIUrl":"10.1093/rpd/ncae203","url":null,"abstract":"Soil samples were collected from vegetable agricultural areas in and around Addis Ababa, and their levels of radioactivity were measured. Gamma spectrometry with high-purity germanium detector was used to quantify radioactivity level. The average concentration of 226Ra, 232Th, and 40K were 32.8 ± 2.1, 62.4 ± 4.4, and 544.3 ± 23.3 Bq kg-1 respectively. The mean values of 232Th and 40K are higher, whereas the value of 226Ra is comparable with world average values. Radiological hazard indices, including radium equivalent activity (Raeq), absorbed dose rate (Dr), outdoor annual effective dose equivalent (Deff), external hazard index (Hex), internal hazard index (Hin), and gamma radiation representative level index (Iγ), were calculated based on the activity concentration of 226Ra, 232Th and 40K. The mean values were 163.9 Bq kg-1, 78.7 nGy h-1, 0.10 mSv y-1, 0.44, 0.53, and 0.60 respectively. All indices are lower than global recommended limit values. These results revealed that radiation hazard due to radionuclides in the soil of the study area is insignificant.","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"1951-1960"},"PeriodicalIF":0.8,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142473289","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}

引用次数: 0

Integration of a dose management system in the public hospitals of Cyprus: Key areas and initial outcomes. 在塞浦路斯公立医院整合剂量管理系统：关键领域和初步成果。

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-12-06 DOI: 10.1093/rpd/ncae210

Eleni Skouridi, Vasileios Metaxas, Demetris Kaolis, Georgiana Kokona

{"title":"Integration of a dose management system in the public hospitals of Cyprus: Key areas and initial outcomes.","authors":"Eleni Skouridi, Vasileios Metaxas, Demetris Kaolis, Georgiana Kokona","doi":"10.1093/rpd/ncae210","DOIUrl":"10.1093/rpd/ncae210","url":null,"abstract":"Despite the growing use of dose management systems (DMSs), there is limited guidance on their optimal setup. This study aims to fill this gap by outlining the process followed to integrate \"DOSE\" (Qaelum NV, Belgium) DMS within the Cypriot public hospitals. DOSE was connected to the available central PACS, followed by a thorough data and functioning validation. A preliminary study was also conducted to assess the DOSE's ability to establish typical dose values in diagnostic radiography. Overall, over 70 x-ray units were configured. For some connections, it was necessary to first adjust the unit's DICOM attributes or to utilise the DICOM coercion technique. The DICOM image header was sometimes preferred over the DICOM RDSR, as the chosen data source. This study underscored the importance of understanding the equipment's technical capabilities for a successful DMS integration, while personnel with expertise in diagnostic radiology and the IT aspects of medical physics proved to have a vital role in the process. The pilot study showed that DOSE is an effective tool for establishing typical dose values and assessing compliance with relevant dose levels.","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"2029-2040"},"PeriodicalIF":0.8,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142506724","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}

引用次数: 0

Establishment of typical values in cerebral thrombectomy according to the stroke anatomical region and procedure clinical outcome. 根据脑卒中解剖区域和手术临床结果确定脑血栓切除术的典型值。

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-11-18 DOI: 10.1093/rpd/ncae200

Rogério Lopes, Joana Santos

引用次数: 0

Determination of neutron spectrum based on artificial neural network using liquid scintillation detector EJ-301. 利用液态闪烁探测器 EJ-301 确定基于人工神经网络的中子能谱。

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-11-18 DOI: 10.1093/rpd/ncae189

Wan Bo, Li Gang, Li Kun, Huang Qichang, Xiong Bangping, Cai Jiao, He Jiaji, Wei Wenbin, Xia Yuan, Yang Daibo

{"title":"Determination of neutron spectrum based on artificial neural network using liquid scintillation detector EJ-301.","authors":"Wan Bo, Li Gang, Li Kun, Huang Qichang, Xiong Bangping, Cai Jiao, He Jiaji, Wei Wenbin, Xia Yuan, Yang Daibo","doi":"10.1093/rpd/ncae189","DOIUrl":"10.1093/rpd/ncae189","url":null,"abstract":"This paper focuses on the neutron spectrum measurement using a liquid scintillation detector, where the neutron spectrum could be identified and unfolded from the light output distribution of the EJ-301 liquid scintillation detector through a linear artificial neural network (ANN). The response functions of the EJ-301 detector for monoenergetic neutron sources, as well as the light outputs, have been simulated and calculated by Monte Carlo procedure FLUKA. The linear ANN was trained and tested through the simulated data, where response functions were set as the input of ANN and the corresponding neutron spectra were output. Therefore, the neutron spectrum-unfolding model was created. This spectrum-unfolding model was tested through the light outputs induced by monoenergetic neutrons and the random superposition of them. Unfolding results show that this model could identify the information of the neutron spectrum accurately from the light outputs of a liquid scintillation detector. Moreover, the EJ-301 detector was used to measure the radioactivity of 252Cf, and the pulse height distribution induced by neutrons was derived through the charge-comparison method to remove the influence of gamma rays. The measured pulse height distribution was unfolded by the trained model, and measured results show that the unfolded neutron spectrum of 252Cf was consistent with the reference one. This paper presents the feasibility that the unknown neutron spectrum could be identified and confirmed through a linear neural network trained by simulated monoenergetic neutron response functions, which could be a candidate of choice for the determination of the neutron spectrum.","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"1867-1873"},"PeriodicalIF":0.8,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142294002","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}

引用次数: 0

The out-of-plane contact shield and mA-modulation - the effect on fetal absorbed dose. 平面外接触屏蔽和毫安调制--对胎儿吸收剂量的影响。

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-11-18 DOI: 10.1093/rpd/ncae204

Heli R S Larjava, Chibuzor T M Eneh, Aleksi Saikkonen, Riitta K Parkkola

引用次数: 0

Occupational radiation dose among student radiographers, nuclear medicine technologists, and radiotherapists in an Australian university. 澳大利亚一所大学放射技师、核医学技师和放射治疗师学生的职业辐射剂量。

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-11-13 DOI: 10.1093/rpd/ncae160

Pradip Deb

引用次数: 0

Practical cut-off value for radon concentration in indoor air using an activated-charcoal radon collector. 使用活性炭氡收集器测定室内空气中氡浓度的实用临界值。

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-11-13 DOI: 10.1093/rpd/ncae108

Yumi Yasuoka, June Takemoto, Yasutaka Omori, Nanaho Kawamoto, Nao Goda, Hiroyuki Nagahama, Jun Muto, Shinji Tokonami, Masahiro Hosoda, Takeshi Iimoto, Takahiro Mukai

引用次数: 0