journal
https://read.qxmd.com/read/38324508/glandular-doses-and-diagnostic-reference-levels-drls-for-saudi-breast-cancer-screening-programme-2012-2021
#21
JOURNAL ARTICLE
Salman M Albeshan, Ahmad A Alhulail, Maha M Almuqbil
The aim of this study was to report the diagnostic reference levels (DRLs) corresponding to different compressed breast thickness (CBT) ranges. To achieve this, mammographic examinations with 187,788 exposures were analysed. The mean average glandular (AGD) dose was calculated per view, examination, and center. Moreover, the DRL values corresponding to different CBT ranges were reported. The result of the mean AGD per view was found to be 1.36 mGy for craniocaudal (CC) and 1.54 mGy for Mediolateral oblique (MLO), while the mean AGD per examination for all women was 1...
February 6, 2024: Radiation Protection Dosimetry
https://read.qxmd.com/read/38297979/correction-to-baseline-micronucleus-frequencies-and-60co-cytokinesis-block-micronucleus-assay-dose-response-curve-for-biodosimetry-in-vietnam
#22
(no author information available yet)
No abstract text is available yet for this article.
January 30, 2024: Radiation Protection Dosimetry
https://read.qxmd.com/read/38273648/a-comparative-study-of-boost-dose-delivery-techniques-in-breast-cancer-radiotherapy-optimising-efficacy-and-minimising-toxicity
#23
JOURNAL ARTICLE
Khalid El Ouardi, Mustapha Zerfaoui, Yassine Oulhouq, Karim Bahhous, Abdeslem Rrhioua, Dikra Bakari
The present study aims to compare three techniques for delivering a boost absorbed dose: conventional reduced tangential (3D), volumetric modulated arc therapy (VMAT) and fields forward-planned technique boost (3DF). The study included 15 postoperative breast cancer patients who received a boost absorbed dose following breast-conserving surgery. The conformity index and homogeneity index were used to evaluate treatment outcomes, along with the average absorbed dose received by organs at risk (OAR). All the calculated dosimetric plans are carried out using Monaco Treatment Planning System (TPS)...
January 25, 2024: Radiation Protection Dosimetry
https://read.qxmd.com/read/38243879/optimizing-chemical-induced-premature-chromosome-condensation-assay-for-rapid-estimation-of-high-radiation-doses
#24
JOURNAL ARTICLE
Ryo Nakayama, Donovan Anderson, Valerie Swee Ting Goh, Yohei Fujishima, Kaito Yanagidate, Kentaro Ariyoshi, Kosuke Kasai, Mitsuaki A Yoshida, William F Blakely, Tomisato Miura
In the event of exposure to high doses of radiation, prompt dose estimation is crucial for selecting appropriate treatment modalities, such as cytokine therapy or stem cell transplantation. The chemical-induced premature chromosome condensation (PCC) method offers a simple approach for such dose estimation with significant radiation exposure, but its 48-h incubation time poses challenges for early dose assessment. In this study, we optimized the chemical-induced PCC assay for more rapid dose assessment. A sufficient number of PCC and G2/M-PCC cells were obtained after 40 h of culture for irradiated human peripheral blood up to 20 Gy...
January 19, 2024: Radiation Protection Dosimetry
https://read.qxmd.com/read/38226499/simultaneous-measurements-of-radon-thoron-and-thoron-progeny-and-induced-cancer-risk-assessment-in-djeno-pointe-noire-republic-of-congo
#25
JOURNAL ARTICLE
Jucit Sem Sondzo, Guy Blanchard Dallou, Philippe Ondo Meye, Russel Rolphe Caroll Moubakou Diahou, Clobite Bouka Biona, Chutima Kranrod, Yasutaka Omori, Masahiro Hosoda, Saïdou, Shinji Tokonami
In this study, the activity concentrations of radon (222Rn), thoron (220Rn) and thoron progeny were measured simultaneously in Djeno (Pointe-Noire, Republic of Congo) using RADUET detectors to evaluate the air quality and the radiological risks due to the inhalation of these radionuclides. Activity concentrations of radon progeny were calculated from those of radon. Indoor radon, thoron and progenies followed a lognormal distribution ranging between 20 and 40, 6 and 62, 8 and 17.6 and 0.4 and 19.6 Bq m-3 for radon, thoron, radon progeny and thoron progeny, respectively...
January 15, 2024: Radiation Protection Dosimetry
https://read.qxmd.com/read/38221673/assessment-of-radioactivity-in-sand-samples-from-eastern-nepal-in-perspective-of-radiological-hazards
#26
JOURNAL ARTICLE
Arun Kumar Shrestha, Ganesh Kumar Shrestha, Buddha Ram Shah, Ram Prasad Koirala
This study was conducted to investigate the activity concentrations of 226Ra, 232Th and 40K in the sand samples and the health hazards associated with them utilizing a NaI (Tl) gamma spectrometer. The average activity concentrations of 226Ra, 232Th and 40K were found to be 24.8 ± 10.1, 39.8 ± 16.4 and 531.3 ± 52.8 Bq kg-1, respectively. The calculated radiological hazard parameters, including radium equivalent activity, absorbed gamma dose and effective dose rate, were found to be 122...
January 13, 2024: Radiation Protection Dosimetry
https://read.qxmd.com/read/38196028/radiation-dose-to-breast-during-digital-mammography-in-tanzania
#27
JOURNAL ARTICLE
Elisha Edmund, Mary Kamuzora, Wilbroad Muhogora, Patrick Ngoya, Alex Muhulo, Assad Amirali, Atumaini Makoba, Wilson Ngoye, Justin Ngaile, Salma Majatta, Miguta Ngulimi, Salome Mwambinga, Tunu Kaijage
The aim of this study was to evaluate the mean glandular dose (MGD), to assess the potential for optimization, and to propose diagnostic reference levels (DRLs). MGD was estimated from air kerma measurements and patient information collected during mammography examinations. The 75th percentile values were determined as the third quartile of the median MGD values for all hospitals, and DRLs set as 75th percentile of MGD values. The estimated median values of MGD ranged from 1.5 to 3.9 mGy for craniocaudal projection for median range of 15-59 mm compressed breast thickness (CBT)...
January 9, 2024: Radiation Protection Dosimetry
https://read.qxmd.com/read/38196003/a-preliminary-study-on-determination-of-radioactivity-levels-and-estimation-of-the-annual-effective-dose-in-dried-fruits-consumed-in-albania
#28
JOURNAL ARTICLE
Erjon Spahiu, Manjola Shyti, Irma Bërdufi
This work aimed to support Albania's food safety monitoring regime. In this context, the natural and artificial radioactivity was measured in 20 samples of dried fruits collected randomly in different markets of Tirana. The activity concentration of 40K, 226Ra, 232Th and 137Cs was determined by using the high-purity germanium detector. The maximum values of activity concentration in dried fruits were calculated as 517 ± 22 Bq kg-1 for 40K, 11.10 ± 0.93 Bq kg-1 for 226Ra, 4...
January 9, 2024: Radiation Protection Dosimetry
https://read.qxmd.com/read/38195763/exceeding-radiation-thresholds-for-cataract-induction-in-diagnostic-imaging-a-paediatric-case-report
#29
JOURNAL ARTICLE
Amanda Alison Perdomo, Mohamed Khaldoun Badawy, Cristina Mignone, Jake Cameron Forster
This case report investigates the radiation dose received by a paediatric patient with a ventricular assist device who underwent four non-contrast brain computed tomography (CT) scans, two brain perfusion CT scans and two head angiographic CT scans. The total estimated absorbed dose to the lens of the eye is above the 500 mGy radiation-induced cataract threshold. It is recommended that this patient and those with similar imaging histories have routine follow-up with an ophthalmologist. It is also recommended that radiation dose tracking and an electronic medical alert program be implemented to allow the identification of patients who may exceed tissue reaction thresholds...
January 9, 2024: Radiation Protection Dosimetry
https://read.qxmd.com/read/38195760/the-effect-of-cooling-rate-on-the-precision-of-measurement-of-glow-peak-5-in-the-thermoluminescence-of-lif-mg-ti-tld-100
#30
JOURNAL ARTICLE
Yogev Bokobza, Shlomo Biderman, Yigal Shalom Horowitz, Leonid Oster, Ilan Eliyahu, Alex Shapiro, Dmitry Nemirovsky, Galina Reshes, Beny Herman, Hezy Einav
The effect of natural rapid cooling and oven slow cooling on the precision of thermoluminescence measurements of LiF:Mg,Ti is investigated. Three separate series of measurements resulted in average precisions of 5.1 and 5.0%, respectively. However, the highest precision of 1.7% (1 SD) was achieved for an oven-cooled material.
January 9, 2024: Radiation Protection Dosimetry
https://read.qxmd.com/read/38195745/exposure-frequency-and-radiation-dose-from-ct-examinations-in-huaian
#31
JOURNAL ARTICLE
Binbin Huo, Xiaomin Chen, Zhiyong Xu, Dongdong He, Jin Wang
This study quantified the exposure frequency and established the local diagnostic reference levels (DRLs) for the most common computed tomography (CT) examinations. A combined method census and sampling survey was used to quantify both frequency and radiation dose of CT examinations. Data were acquired through Picture Archiving and Communication System (PACS) or Radiology Information System (RIS). The annual frequency of CT examinations was 239.8 per 1000 inhabitants. The P75 of volume CT dose index (CTDIvol) to adult patients from CT scanning for head, chest, abdomen and lumbar spine examinations were 63...
January 9, 2024: Radiation Protection Dosimetry
https://read.qxmd.com/read/38186062/assessment-of-gamma-absorbed-doses-and-radiological-risk-indexes-from-soil-radioactivity-around-the-phosphate-area-in-south-tunisia
#32
JOURNAL ARTICLE
Sonia Machraoui, Salam Labidi, Mohan M Purushotham
Human beings are constantly exposed to the radiations coming from the environment. This work assesses the radiological hazards of natural radioactivity in soil samples taken at four locations around the phosphate area in south Tunisia. Concentrations of primordial radionuclides were measured by gamma spectrometer using an HPGe detector. The overall mean values of 40K, 226Ra and 232Th concentrations were 264, 27 and 13 Bq kg-1, respectively. From the radioactivity measurements, radiation hazard indices specified by the United Nation Scientific Committee on the Effect of Atomic Radiation such as radium equivalent activity (Raeq), absorbed dose rates ($ {\dot{\text D}} $) and annual effective dose (AED) to the population for outdoor environment were determined...
January 6, 2024: Radiation Protection Dosimetry
https://read.qxmd.com/read/38186237/reconstruction-of-organ-doses-for-patients-undergoing-computed-tomography-examinations-in-canada-1992-2019
#33
JOURNAL ARTICLE
Choonsik Lee, Brian Moroz, Christopher Thome, Katherine Gaudreau, Pirouz Emami, Mark P Little
We derived the first comprehensive organ dose library for Canadian pediatric and adult patients who underwent computed tomography (CT) scans between 1992 and 2019 to support epidemiological analysis of radiation risk. We calculated organ absorbed doses for Canadian CT patients in two steps. First, we modeled Computed Tomography Dose Index (CTDI) values by patient age, scan body part, and scan year for the scan period between 1992 and 2019 using national survey data conducted in Canada and partially the United Kingdom survey data as surrogates...
January 5, 2024: Radiation Protection Dosimetry
https://read.qxmd.com/read/38186202/gamma-irradiation-system-s-performance-tests
#34
JOURNAL ARTICLE
Azamat Taubaldiev, Miloš Živanović
This study reviews the performance analysis of a 137Cs irradiation system that has recently been installed in the laboratory of Uzbek National Institute of Metrology. The laboratory is responsible for calibrating calibration facilities and for calibrating most protection level radiation monitoring instruments used in medical, nuclear, industrial and academic settings in Uzbekistan. This system employs the most advanced radiation safety standards, along with 21st century source automation methods. In this work, we review the system's performance according to ISO 4037 and present measurement uncertainty budget...
January 5, 2024: Radiation Protection Dosimetry
https://read.qxmd.com/read/38152971/correction-to-pathology-based-radiation-dose-in-computed-tomography-investigation-of-the-effect-of-lung-lesions-on-water-equivalent-diameter-ctdivol-and-ssde-in-covid-19-patients
#35
(no author information available yet)
No abstract text is available yet for this article.
December 28, 2023: Radiation Protection Dosimetry
https://read.qxmd.com/read/38149329/gamma-rays-and-neutrons-attenuation-performance-of-a-developed-lead-borate-glass-for-radiotherapy-room
#36
JOURNAL ARTICLE
Mona Abo Zeed, Raed M El Shazly, Eman Elesh, Hanaa M El-Mallah, Aly Saeed
The development of radiation therapy necessitated a continuous R&D for radiotherapy rooms' glass windows to reach the highest levels of protection for the staff of the radiotherapy facility. Therefore, in this article, a novel type of lead borate glass depending on parallel augmenting of lead and boron was produced to be used as gamma-rays and fast and thermal neutrons barriers in radiotherapy rooms. Neutrons and gamma rays' attenuation parameters, fast neutrons removal cross section ${\varSigma}_R$, thermal neutron total cross section ${\sigma}_T$, mass attenuation coefficient $\sigma$, linear attenuation coefficient μ, half-value layer, mean free path, effective atomic number Zeff, effective electron density Neff, and buildup factor for energy absorption (energy absorption buildup factor) and exposure (exposure buildup factor) were studied extensively...
December 26, 2023: Radiation Protection Dosimetry
https://read.qxmd.com/read/38148716/risk-assessment-from-radon-in-domestic-water-for-the-greek-population
#37
JOURNAL ARTICLE
Michalakis Omirou, Alexandros Clouvas, Fokion Leontaris, Ioannis Kaissas
This study focused on assessing the risk from the exposure to radon contained in domestic water for a significant part (~20%) of the Greek population. Also, the variation of radon in domestic water was monitored from 2017 to 2023 in certain villages that showed relatively high radon levels and relied on boreholes for their water supply. The radon in domestic water activity concentrations measured in the investigated Greek places ranged from lower than the minimum detection limit (2 Bq L-1) levels up to 187 Bq L-1 with an average value of 9...
December 26, 2023: Radiation Protection Dosimetry
https://read.qxmd.com/read/38145953/occupational-internal-monitoring-in-nuclear-medicine-service-of-sainte-anne-military-hospital-previous-considerations-and-results
#38
JOURNAL ARTICLE
Héloïse Gervot, Wilfried Letessier, Jérôme Loess, Christopher Bayle-Escurat, Denis Métivier, Dominique Saurat, Emilie Jamet-Anselme
The Nuclear Medicine Department of Sainte-Anne military hospital in Toulon uses 99mTc, 123I and 18F unsealed sources to provide therapeutic and diagnostic care. For a few years, only ambient air and surface monitoring were performed to check the absence of internal contamination risk for workers. To verify this risk assessment hypothesis, confirmatory monitoring programme including in vivo and in vitro measurements was performed by the French defence radiation protection service (SPRA, Clamart). Here, due to the short half-life of targeted radionuclides, the analytical sensitivity was determined with estimations of minimal detectable activities and derived recording levels...
December 23, 2023: Radiation Protection Dosimetry
https://read.qxmd.com/read/38126870/an-innovative-approach-for-estimating-energy-absorption-buildup-factors-eabf-with-hvl-and-tvl
#39
JOURNAL ARTICLE
Narayanappa Nagaraja, Holaly C Manjunatha, Krishnachari Nagarathnamma Sridhar, Nagarajan Sowmya, Lakshmaiah Seenappa, Rajachari Munirathnam, Renu Soundar
The current study proposes an empirical formula for absorption buildup factors as a function of target thickness. The present formula produces absorption buildup factors of compounds and mixtures with simple inputs of linear attenuation coefficient (μ), tenth value layer (TVL) and half value layer (HVL) of interacting target for the atomic number region 29 < Z < 92 for the energies 0.2 MeV < E < 1.5 MeV. This method is used to compute the energy absorption buildup factors using HVL and TVL...
December 21, 2023: Radiation Protection Dosimetry
https://read.qxmd.com/read/38126869/pm1-pm2-5-and-pm10-size-fraction-distribution-under-steady-state-conditions-in-a-walk-in-type-222rn-calibration-chamber-facility
#40
JOURNAL ARTICLE
Anidil P Vijith, Yelia S Mayya, Rosaline Mishra, Balvinder K Sapra, Naregundi Karunakara
Attachment of 222Rn progenies, upon their formation, to the atmospheric aerosols and inhalation of these radioactive aerosols causes inhalation dose to the human being. Aerosols have the characteristics of small particle size, long-time suspension and long-distance transmission and easy access to the deep respiratory tract. Aerosols are responsible for viral infection risk such as the recent worldwide pandemic caused by severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2, or COVID-19). Understanding the formation and behaviour of aerosols in a confined environment in various human habitations is essential to combat such detrimental exposures...
December 21, 2023: Radiation Protection Dosimetry
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