Results 251 to 260 of about 25,674 (297)

Dose calibration uncertainty and plan-specific dose calibration for IMRT QA

Biomedical Physics & Engineering Express, 2018
Purpose: This study was to investigate IMRT QA dose calibration uncertainty that has not been realized before, and develop plan-specific calibration methods to reduce such uncertainty. Methods: IMRT plans were created on the Varian Eclipse treatment planning system.
Wei Luo, Yinnan Meng, Stephen Brock Westlund   +2 more
openaire   +1 more source

Absolute dose calibration in PIII

Surface and Coatings Technology, 2004
Accurate absolute dose measurements are still a challenge in plasma immersion ion implantation (PIII). Here, a contact-free method using a pyrometer and the sample as a thermal probe is presented. Good agreement between simulated temperature evolutions and measurements were obtained, allowing a direct determination of the incident ion flux.
D Manova, F Scholze, S Mändl, H Neumann, B Rauschenbach   +4 more
openaire   +2 more sources

Calibration of Safecast dose rate measurements

Journal of Environmental Radioactivity, 2018
A methodology is presented to calibrate contributed Safecast dose rate measurements acquired between 2011 and 2016 in the Fukushima prefecture of Japan. The Safecast data are calibrated using observations acquired by the U.S. Department of Energy at the time of the 2011 Fukushima Daiichi power plant nuclear accident.
Guido Cervone, Carolynne Hultquist
openaire   +2 more sources

Calibration of rectal dose-rate monitors

The British Journal of Radiology, 1986
In common with many radiotherapy departments, it is standard practice at the Glasgow Institute of Radiotherapeutics and Oncology to measure the dose-rate to the recto-vaginal septum following a gynaecological caesium insertion. This checks that the treatment applicators and vaginal packing are suitably positioned to reduce the dose received by the ...
R, Thomas, R C, Lawson
openaire   +2 more sources

Calibration frequency of dose–area product meters

The British Journal of Radiology, 2001
Calibration of patient dose monitoring devices in diagnostic radiology has become increasingly important in the light of new legislation that requires monitoring of patient dose against local and national diagnostic reference levels. An investigation was conducted into the long-term stability of 41 dose-area product (DAP) meters over a period of ...
M T, Crawley, S, Mutch, M, Nyekiova, C, Reddy, H, Weatherburn   +4 more
openaire   +2 more sources

Concerning radiotherapy standard dose meter calibration

Medical Physics, 1980
Constancy measurements for nine ionization chambers were made using a 2 mg Ra source. (AIP)
openaire   +2 more sources

The advantages of absorbed‐dose calibration factors

Medical Physics, 1992
A formalism for clinical external beam dosimetry based on use of ion chamber absorbed‐dose calibration factors is outlined in the context and notation of the AAPM TG‐21 protocol. It is shown that basing clinical dosimetry on absorbed‐dose calibration factors ND leads to considerable simplification and reduced uncertainty in dose measurement. In keeping
openaire   +3 more sources

[Quality control dose calibrators].

Revista espanola de medicina nuclear, 2005
We have reviewed the legislation about the quality control of dose calibrator. The importance of verifying the correct work of these instruments, is fundamental in daily practice of radiopharmacy and nuclear medicine. The Spanish legislation establishes to include these controls as part of the quality control of radiopharmaceuticals, and the program of
M, Montoza Aguado, A, Delgado García, A, Ramírez Navarro, C, Salgado García, M A, Muros de Fuentes, S, Ortega Lozano, M E, Bellón Guardia, J M, Llamas Elvira   +7 more
openaire   +1 more source

NIST high-dose calibration services

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1989
Abstract There is a need for the standardization of high-dose measurements used in the radiation-processing industry in order to provide assured traceability to national standards. NIST provides dosimetry calibration services to this industry. One of these services involves administration of known absorbed doses of gamma rays to customer-supplied ...
openaire   +1 more source

Cobalt‐60 dose calibration: A comparison of methods

Medical Physics, 1979
Cobalt‐60 dose determination can be accomplished by a variety of methods. This study investigates dose determination by actual “at‐depth” measurement for the depths and field sizes desired as well as by “in‐air” or “in‐water” calibration measurements for both constant SSD and isocentric techniques.
J O, Freim, A, Feldman
openaire   +2 more sources