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Development of α-ray visualization survey meter in high gamma and neutron background environment.
Radiat Prot Dosimetry
November 2024
Radiation Protection Department, Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency, 4-33 Muramatsu, Tokai-mura, Ibaraki 319-1194, Japan.
A survey meter was developed to reliably detect and visualize surface contamination of suits and objects by α-nuclides in high γ/n-rays background radiation environment. The survey meter features a semi-opaque ZnS:Ag scintillator mounted directly onto a multi-anode photomultiplier tube (MA-PMT) and amplification circuits, ensuring output gain equalization for all channels. α-ray events induce localized light emission in thin-film scintillators.
View Article and Find Full Text PDFSystematic characterization of new EBT4 radiochromic films in clinical x-ray beams.
Biomed Phys Eng Express
November 2024
Department of Advanced Radiation Oncology and Proton Therapy, Inova Schar Cancer Institute, VA, United States of America.
. We aim to characterize kinetics of radiation-induced optical density in newly released EBT4 radiochromic films exposed to clinical x-rays. Several film models and batches were evaluated for the film sensitivity, optical signal increasing with time, relative film noise, and minimum detectable limits (MDL).
View Article and Find Full Text PDFDosimetric commissioning of a high-resolution CMOS 2D detector array for patient-specific QA of single-isocenter multi-target VMAT stereotactic radiosurgery.
J Radiat Res
December 2024
Medical Physics, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, NY 10065, USA.
Article Synopsis
- * A study evaluated the myQA SRS device, a high-resolution CMOS 2D detector, for its performance in PSQA by characterizing its dosimetric properties and conducting gamma index analyses on nine simulated and clinical plans.
- * Results indicated that the myQA SRS showed excellent dosimetric agreement with dosimetry films, achieving average gamma index pass rates of 99.9% and 99.2%, demonstrating its reliability and potential as a modern alternative to traditional film dosim
Response characterization of radiochromic OC-1 films in photon, electron, and proton beams.
Med Phys
November 2024
Department of Radiation Oncology, Washington University School of Medicine in St. Louis, St. Louis, Missouri, USA.
Background: Radiochromic film (RCF) dosimeters with their high spatial resolution and tissue equivalent properties are conveniently used for two-dimensional and small-field dosimetry. OC-1 is a new model of RCF dosimeter that was commercially introduced recently. Due to its novelty there is a need to characterize its response in various radiation beam types.
View Article and Find Full Text PDFAssessment of stereotactic high-resolution detectors for stereotactic body radiotherapy: comparative analysis between myQA® SRS and Gafchromic EBT-XD films.
Radiat Environ Biophys
May 2024
Department of Physics, School of Advanced Sciences, Vellore Institute of Technology, Chennai, 6000127, India.
The study aimed to evaluate dosimetry systems used for stereotactic body radiotherapy (SBRT), specifically 2D array dosimetry and film dosimetry systems, for exploring their characteristics and clinical suitability. For this, high-resolution myQA SRS detectors and Gafchromic EBT-XD films were employed. Film analysis included net optical density (OD) values depending on energy, dose rate, scanner orientation, scanning side, and post-exposure growth.
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