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Dose measurements with the Pille-ISS thermoluminescent dosimeter system during extravehicular activities (2004-2022).
Life Sci Space Res (Amst)
February 2025
Institute of Biomedical Problems of the Russian Academy of Sciences, 76A Khoroshevskoye shosse, 123007, Moscow, Russian Federation.
One of the most problematic goals for radiation safety during spaceflight is an assessment of additional doses received by astronauts during extravehicular activity (EVA). The Pille-ISS thermoluminescent dosimeter developed by the predecessor of the Hungarian Research Network (HUN-REN) Centre for Energy Research (Budapest, Hungary) is designed for the routine dose measurements not only inside the spacecraft compartments, but also for personal dosimetric control for EVA. During almost two decades of the International Space Station (ISS) operation, the unique set of 131 EVA doses were recorded in different conditions, such as: solar activity, ISS trajectory along the South Atlantic Anomaly (SAA), and shielding conditions provided by two kinds of spacesuits: the Extravehicular Mobility Unit (EMU) and Orlan.
View Article and Find Full Text PDFInvestigation of the effect of thyroid collar, radiation safety glasses and lead apron on radiation dose in cone beam computed tomography.
Dentomaxillofac Radiol
January 2025
Assist. Prof. Dr, Selcuk University Faculty of Medicine, Department of Radiation Oncology, Konya, 42130, Turkiye.
Objectives: Due to the increasing use of cone-beam computed tomography (CBCT) in dentistry and considering the effects of radiation on radiosensitive organs, the aim of this study was to investigate the effect of shielding on absorbed dose of eyes, thyroid and breasts in scans conducted with different parameters using two different fields of view (FOV).
Methods: Dose measurements were calculated on a tissue-equivalent female phantom by repeating each scanning parameter three times and placing at least two thermoluminescent dosimeters (TLD) on each organ, with the averages then taken. The same CBCT scans were performed in two different FOV with shielding including thyroid collar, radiation safety glasses and lead apron and without shielding.
Eye lens dosimetry: does the direction of rotation (vertical or horizontal) play a role in type testing?
J Radiol Prot
January 2025
Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany.
With the International Commission on Radiological Protection (ICRP) lowering the annual dose limit for the eye lens to 20 mSv, precise monitoring of eye lens exposure has become essential. The personal dose equivalent at a depth of 3 mm,(3), is the measurement method for monitoring the dose to the lens of the eye. Usual dosemeter type-test irradiations at non-normal angles of radiation incidence (≠ 0°) primarily use lateral radiation exposure scenarios, where radiation approaches from the left or right, necessitating rotation of the dosemeter-phantom setup around a vertical axis.
View Article and Find Full Text PDFOn the correction factors for small field dosimetry in 1.5T MR-linacs.
Phys Med Biol
January 2025
Medical Physics Laboratory, School of Medicine, National and Kapodistrian University of Athens, 75 Mikras Asias, Goudi, 115 27 Athens, Greece.
. Clinical dosimetry in the presence of a 1.5 T magnetic field is challenging, let alone in case small fields are involved.
View Article and Find Full Text PDFCharacterization of LiF TLD-100 in carbon ion beams for remote audits.
Med Phys
December 2024
Division of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.
Background: A passive dosimeter framework for the measurement of dose in carbon ion beams has yet to be characterized or implemented for regular use.
Purpose: This work determined the dose calculation correction factors for absorbed dose in thermoluminescent dosimeters (TLDs) in a therapeutic carbon ion beam. TLD could be a useful tool for remote audits, particularly in the context of clinical trials as new protocols are developed for carbon ion radiotherapy.
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