{"title":"Establishment of typical values in cerebral thrombectomy according to the stroke anatomical region and procedure clinical outcome.","authors":"Rogério Lopes, Joana Santos","doi":"10.1093/rpd/ncae200","DOIUrl":"10.1093/rpd/ncae200","url":null,"abstract":"<p><p>The aim of the study is to establish local diagnostic reference levels (DRLs) in cerebral thrombectomy, according to the anatomical region of ischemic stroke. This is a retrospective study from a single center involving 255 examinations. The proposed median values (P50) for thrombectomy are: 123 Gy.cm2 for air kerma-area product (PKA) and 915 mGy for air kerma (Ka,r). For middle cerebral artery (MCA) thrombectomies, the proposed DRLs are 118 Gy.cm2 for PKA and 112 Gy.cm2 for internal carotid artery (ICA). The Ka,r values for MCA and ICA are 849 and 775 mGy, respectively. It was observed that 94.9% of patients presented grade 0 on the initial modified treatment in cerebral infarction (mTICI) scale, and after thrombectomy, 63.1% of patients reached a final mTICI grade of 3. Stents were implanted in 37 patients (14.5% of cases). It was concluded that 16.1% of patients exceeded one trigger value of the Safety in Radiological Procedures' recommended parameters. Establishing DRLs is an important tool for optimizing practices and is considered a standard for quality control.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"1911-1917"},"PeriodicalIF":0.8,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142381567","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}
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":"<p><p>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.</p>","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}
Heli R S Larjava, Chibuzor T M Eneh, Aleksi Saikkonen, Riitta K Parkkola
{"title":"The out-of-plane contact shield and mA-modulation - the effect on fetal absorbed dose.","authors":"Heli R S Larjava, Chibuzor T M Eneh, Aleksi Saikkonen, Riitta K Parkkola","doi":"10.1093/rpd/ncae204","DOIUrl":"10.1093/rpd/ncae204","url":null,"abstract":"<p><p>The effect of patient shielding on fetal radiation dose was evaluated in computed tomography pulmonary angiography with the out-of-plane shield visible in the localizer but absent in the scan range in chest computed tomography (CT). An anthropomorphic phantom with additional prosthetic pregnancy belly was scanned with different CT scanners using clinical imaging protocols and radiophotoluminescence dosemeters (GD-352 M). The out-of-plane shield decreased the fetal absorbed radiation dose with Siemens Somatom go.Up, Canon Aquilion Prime SP and Canon Aquilion One scanners. The decrease was 3.9%-39.4% (0.01-0.09 mGy). With GE Optima the shield increased the fetal dose by 100% (0.23 mGy), with Canon Aquilion One and GE Optima scanners the abdomen dose increase was 17.5% and 36.4%, respectively (0.61 and 1.38 mGy). Applying an out-of-plane shield outside the scanned volume may increase the fetal radiation dose during CT when using tube current modulation, depending on the make and model of the CT scanner.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"1945-1949"},"PeriodicalIF":0.8,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11571229/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142406806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Occupational radiation dose among student radiographers, nuclear medicine technologists, and radiotherapists in an Australian university.","authors":"Pradip Deb","doi":"10.1093/rpd/ncae160","DOIUrl":"https://doi.org/10.1093/rpd/ncae160","url":null,"abstract":"<p><p>To become registered radiation worker as radiographer, nuclear medicine (NM) technologist, or radiotherapist in Australian health system, a 4-y bachelor's degree, or a 2-y master's degree in medical imaging (MI), NM, or radiation therapy (RT) approved by the Australian Health Practitioner Regulation Agency is required. During their supervised clinical practice period, it is crucial to monitor students' occupational radiation dose as their annual dose limit is 1 mSv y-1 unlike regular occupational dose of 20 mSv y-1. In this study, the distribution and trend of occupational dose among over 300 radiography, NM, and radiotherapy student practitioners per year in an Australian university are analyzed over a period of 10 y (2013-22). The overall average annual effective dose was well below the dose limit set for the students. Among the three streams-MI, NM, and RT-NM students had the highest annual dose.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":"200 16-18","pages":"1537-1541"},"PeriodicalIF":0.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142626884","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":"Practical cut-off value for radon concentration in indoor air using an activated-charcoal radon collector.","authors":"Yumi Yasuoka, June Takemoto, Yasutaka Omori, Nanaho Kawamoto, Nao Goda, Hiroyuki Nagahama, Jun Muto, Shinji Tokonami, Masahiro Hosoda, Takeshi Iimoto, Takahiro Mukai","doi":"10.1093/rpd/ncae108","DOIUrl":"10.1093/rpd/ncae108","url":null,"abstract":"<p><p>The World Health Organization (WHO) recommends that countries adopt the reference level of 100 Bq m-3 for indoor radon gas. Adopting the reference level requires a preliminary assessment of the indoor radon concentration. In the preliminary investigation, a cut-off value is useful, which is a value for selecting samples that can be reliably determined to be below the reference level (in this paper, the WHO reference level) using a straightforward method. If the true value was the WHO reference level, then the cut-off value of the PicoRad collector for selecting samples was determined as 80 Bq m-3 through the analysis of the 95% prediction interval.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":"200 16-18","pages":"1701-1705"},"PeriodicalIF":0.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11561575/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142626896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Establishment of acquired radioresistant cells to fractionated radiation from hTERT-immortalized normal human epithelial cell.","authors":"Masatoshi Suzuki, Rio Isobe, Taku Sato, Ryoya Ishikawa, Keiji Suzuki, Yasushi Kino, Tomisato Miura, Yohei Inaba, Koichi Chida, Manabu Fukumoto","doi":"10.1093/rpd/ncae118","DOIUrl":"https://doi.org/10.1093/rpd/ncae118","url":null,"abstract":"<p><p>Senescence-like growth arrest (SLGA), which is a radiation-induced cell death pathway, is induced in immortalized normal human epithelial cell (hTERT-RPE1) by the daily fractionated X-irradiation with 1.5 Gy within 30 times. We here demonstrate that pre-treatment induces acquired radioresistance (ARR) that can survive from the lethal fractionated radiation. The parent cells were daily fractionated with 1.5 Gy for 5 d and then incubated for 7 d without fractionated radiation. After this, the daily fractionated radiation with 1.5 Gy was restarted. A small population of surviving cells appeared after 30 times of the daily fractionated radiation was completed and they were continuously growing up to 120 times of the daily fractionated radiation (RPE1-1.5Fr). We confirmed a higher basal expression level of p53, which functions in the activation of the SLGA pathway but fails to further accumulate after 1.5 Gy of single irradiation in RPE1-1.5Fr. It is the first report to induce ARR phenotype for fractionated radiation in normal human cells.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":"200 16-18","pages":"1636-1640"},"PeriodicalIF":0.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142626646","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}
Miklós Hegedűs, Haruka Kuwata, Khemruthai Kheamsiri, Maté Novák, Ryohei Yamada, Naofumi Akata, Tibor Kovács
{"title":"Tritium determination in natural water samples in Fukushima from 2022 to 2023 using an ultra-low-level tritium counting system.","authors":"Miklós Hegedűs, Haruka Kuwata, Khemruthai Kheamsiri, Maté Novák, Ryohei Yamada, Naofumi Akata, Tibor Kovács","doi":"10.1093/rpd/ncae166","DOIUrl":"https://doi.org/10.1093/rpd/ncae166","url":null,"abstract":"<p><p>The Fukushima Daiichi Nuclear Power Plant (FDNPP) accident created large stockpiles of tritium containing cooling water, which is to be gradually released into the Pacific Ocean, gaining attention from surrounding countries, environmental groups, and local residents concerned with the possibility of increasing tritium concentrations in the water and food cycle. Establishing baseline concentration levels and monitoring tritium immission values are important for assuring public safety, providing data for scientific research and risk communication. Tritium concentrations in the environment are very low; therefore, tritium measurements require enrichment in order to estimate the radiation exposure from drinking water intake and provide information on the water cycle. Natural water samples were collected at Tomioka Town located south of the FDNPP. Samples were distilled, enriched by electrolysis, and re-distilled using an improved SPE method to preconcentrate tritium to measureable levels. Tritium concentrations were determined by a low-background liquid scintillation counter. The observed tritium concentrations were relatively low, rainwater had a mean and SD value of 0.40 ± 0.13 Bq/L, and freshwater samples showed similar concentrations, while brackish coastal water samples were below 0.13 ± 0.02 Bq/L. The observed tritium concentrations in this study are considered safe as effective doses based on annual drinking water intake; however, continous monitoring is necessary to assure public safety.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":"200 16-18","pages":"1845-1849"},"PeriodicalIF":0.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142626876","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}
Minseok Kim, Toshihiro Shibata, Takayuki Sasaki, Junichi Suzuki
{"title":"ICP-MS determination of background I-129 in seaweed samples around Fukushima Daiichi NPS.","authors":"Minseok Kim, Toshihiro Shibata, Takayuki Sasaki, Junichi Suzuki","doi":"10.1093/rpd/ncae163","DOIUrl":"https://doi.org/10.1093/rpd/ncae163","url":null,"abstract":"<p><p>TEPCO planned the release of Advanced Liquid Processing System (ALPS)-treated water, which is decontaminated stagnated water by ALPS, to the Pacific Ocean in 2023 after diluting it more than a hundred times in accordance with the policy of the Japan government. Since the low level of I-129 can remain in ALPS-treated water, the background I-129 concentration in seaweed samples around 1F NPS before the release of ALPS-treated water was recorded in this study. The iodine in seaweed samples was extracted via TMAH alkali-dissolution, and the I-129 concentration was measured by 8900 Triple Quadrupole ICP-MS. The resulting I-129 concentration was <5.4 × 10-2 Bq/kg-wet (sargassum) and <2.7 × 10-2 Bq/kg-wet (laminaria), respectively.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":"200 16-18","pages":"1850-1855"},"PeriodicalIF":0.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142626759","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":"Attempt to re-estimate organ doses of victims in non-homogeneous exposure accident by means of the state-of-the-art Mesh-type Reference Computational Phantom-a case study of an IR-192 source accident.","authors":"Munehiko Kowatari, Hiroshi Yoshitomi, Kotaro Tani, Yoshihiko Tanimura, Osamu Kurihara","doi":"10.1093/rpd/ncae070","DOIUrl":"https://doi.org/10.1093/rpd/ncae070","url":null,"abstract":"<p><p>An attempt was made to estimate organ doses of a victim in a high-dose non-homogeneous exposure accident caused by a sealed 192Ir gamma-ray source. The Gilan accident was selected as a case study. Organ doses including testis, red bone marrow and so on were properly estimated by applying the Monte Carlo calculation with the state-of-the-art adult male Mesh type Reference Computational Phantom. By introducing a complicated exposure scenario, the dose distribution on the right chest of the victim in the Gilan accident could be reproduced to a certain extent.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":"200 16-18","pages":"1574-1579"},"PeriodicalIF":0.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142626257","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}
Krzysztof W Fornalski, Łukasz Adamowski, Ernest Bugała, Rafał Jarmakiewicz, Julianna Krasowska, Łukasz Piotrowski
{"title":"Radiation adaptive response: the biophysical phenomenon and its theoretical description.","authors":"Krzysztof W Fornalski, Łukasz Adamowski, Ernest Bugała, Rafał Jarmakiewicz, Julianna Krasowska, Łukasz Piotrowski","doi":"10.1093/rpd/ncae053","DOIUrl":"https://doi.org/10.1093/rpd/ncae053","url":null,"abstract":"<p><p>The radiation adaptive response (or radioadaptation) effect is a biophysical and radiobiological phenomenon responsible for, e.g. the enhancement of repair processes, cell cycle and apoptosis regulation or enhancement of antioxidant production in cells/organisms irradiated by low doses and low dose-rates of ionising radiation. This phenomenon, however, is not always present, which creates many problems both for experimenters and theoreticians. Here we propose a comprehensive and complete theoretical model of radioadaptation grounded in mathematical concept of dose- and time-related probability function of the adaptive response appearance. This can be used in the context of two special cases of the adaptive response: the Raper-Yonezawa (priming dose) effect or constant low-dose-rate irradiation (e.g. for high natural background). This complete theoretical approach is supported by Monte Carlo simulations and real-experimental data used for model calibration and validation.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":"200 16-18","pages":"1585-1589"},"PeriodicalIF":0.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142626901","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}