نتایج جستجو برای: dosimetry

تعداد نتایج: 8115  

Journal: :Medical physics 2011
Larry A DeWerd Geoffrey S Ibbott Ali S Meigooni Michael G Mitch Mark J Rivard Kurt E Stump Bruce R Thomadsen Jack L M Venselaar

This report addresses uncertainties pertaining to brachytherapy single-source dosimetry preceding clinical use. The International Organization for Standardization (ISO) Guide to the Expression of Uncertainty in Measurement (GUM) and the National Institute of Standards and Technology (NIST) Technical Note 1297 are taken as reference standards for uncertainty formalism. Uncertainties in using det...

2016
Brian Køster Jens Søndergaard Jesper Bo Nielsen Martin Allen Mette Bjerregaard Anja Olsen Joan Bentzen

Dosimeters and diaries have previously been used to evaluate sun-related behavior and UV exposure in local samples. However, wearing a dosimeter or filling in a diary may cause a behavioral change. The aim of this study was to examine possible confounding factors for a questionnaire validation study. We examined the effects of wearing dosimeters and filling out diaries, measurement period and r...

2012

Introduction: Electronic portal imaging devices (EPIDs) are extensively used for dosimetric information of pre-treatment field verification and in-vivo dosimetry for Intensity Modulated Radiotherapy (IMRT). In the present work, we have implemented the newly developed portal dosimetry software using independent dose prediction algorithm EPIDose and evaluated this new tool for the pretreatment IM...

Journal: :Lighting Research & Technology 2022

For field research of non-visual effects light, accurate measurement personal light exposure is required. A consensus framework for light-dosimetry could improve and ensure comparability between studies. Here, we present a review methodologies used in studies published to date, focussing on considerations regarding the preparation data. Overall, large variability studies’ observed, highlighting...

Journal: :Environmental Health Perspectives 1991
J Cameron

This article summarizes the basic facts about the measurement of ionizing radiation, usually referred to as radiation dosimetry. The article defines the common radiation quantities and units; gives typical levels of natural radiation and medical exposures; and describes the most important biological effects of radiation and the methods used to measure radiation. Finally, a proposal is made for ...

2012
C. M. M. Paschoal L. A. P. Santos

In this study three commercial semiconductor devices were characterized in the laboratory for computed tomography dosimetry: one photodiode and two phototransistors. It was evaluated four responses to the irradiation: dose linearity, energy dependence, angular dependence and loss of sensitivity after X ray exposure. The results showed that the three devices have proportional response with the a...

2010
Vagner Ferreira Cassola Gabriela Hoff

OBJECTIVE: To compare data regarding dosimetry and photons fluence in different breast phantoms, discussing constancy tests and dosimetry applied to mammography. MATERIALS AND METHODS: Different homogeneous breast phantoms and one anthropomorphic voxel phantom were developed for collection of data regarding total absorbed dose in the phantom, absorbed dose in the glandular tissue material-equiv...

Journal: :Seminars in nuclear medicine 2008
Ruby Meredith Barry Wessels Susan Knox

The development of radionuclide therapies during the past few decades provides a growing body of data on radiobiologic effects, including normal tissue toxicities and antitumor efficacy. Information on normal tissue toxicity from radionuclides is more limited than that from external beam radiation and appears to be more variable. Much of the increased variability is attributed to heterogeneous ...

Journal: :Turkish journal of haematology : official journal of Turkish Society of Haematology 2000
A Top M Coşkun T Orta

Development of radiation technology has resulted in increasing numbers of people working with it. Therefore it has increasingly been important to monitor the radiation in order to ensure public safety. Physical dosimetry plays an important role in monitoring. But a need arise for biological dosimetry where physical dosimetry is absent or its presence is insufficient. In this study Co-60 gamma r...

Journal: :Physics in medicine and biology 2014
Suaad A Meerkhan Katarina Sjögreen-Gleisner Erik Larsson Sven-Erik Strand Bo-Anders Jönsson

A heterogeneous distribution of radionuclides emitting low-energy electrons in the testicles may result in a significant difference between an absorbed dose to the radiosensitive spermatogonia and the mean absorbed dose to the whole testis. This study focused on absorbed dose distribution in patients at a finer scale than normally available in clinical dosimetry, which was accomplished by combi...

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