A New Method for Computer Generation of Dose Distributions from External X- and Gamma-Ray Sources

Radiology ◽  
1973 ◽  
Vol 106 (1) ◽  
pp. 199-208
Author(s):  
Howard D. Thames
Keyword(s):  
Gamma Ray ◽  
New Method ◽  
Dose Distributions ◽  
Computer Generation

scholarly journals New Approach for the Determination of Radiological Parameters on Hardened Cement Pastes with Coal Fly Ash

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 475
Author(s):  
Ana María Moreno de los Reyes ◽  
José Antonio Suárez-Navarro ◽  
Maria del Mar Alonso ◽  
Catalina Gascó ◽  
Isabel Sobrados ◽  
...  
Keyword(s):  
Fly Ash ◽  
Activity Concentration ◽  
Gamma Ray ◽  
Coal Fly Ash ◽  
Cementitious Materials ◽  
New Method ◽  
Supplementary Cementitious Materials ◽  
Hardened Cement ◽  
Cement Pastes ◽  
Activity Concentrations

Supplementary cementitious materials (SCMs) in industrial waste and by-products are routinely used to mitigate the adverse environmental effects of, and lower the energy consumption associated with, ordinary Portland cement (OPC) manufacture. Many such SCMs, such as type F coal fly ash (FA), are naturally occurring radioactive materials (NORMs). 226Ra, 232Th and 40K radionuclide activity concentration, information needed to determine what is known as the gamma-ray activity concentration index (ACI), is normally collected from ground cement samples. The present study aims to validate a new method for calculating the ACI from measurements made on unground 5 cm cubic specimens. Mechanical, mineralogical and radiological characterisation of 28-day OPC + FA pastes (bearing up to 30 wt % FA) were characterised to determine their mechanical, mineralogical and radiological properties. The activity concentrations found for 226Ra, 212Pb, 232Th and 40K in hardened, intact 5 cm cubic specimens were also statistically equal to the theoretically calculated values and to the same materials when ground to a powder. These findings consequently validated the new method. The possibility of determining the activity concentrations needed to establish the ACI for cement-based materials on unground samples introduces a new field of radiological research on actual cement, mortar and concrete materials.

scholarly journals A new method for evaluating weak leakage gamma-ray dose using a 3".PHI.*3" NaI(Tl) scintillation spectrometer. (III). Expanding of applicable energy range.

1987 ◽  
Vol 22 (3) ◽  
pp. 283-286
Author(s):  
Hideharu MATSUDA ◽  
Shigeko FURUKAWA ◽  
Tokishi KAMINISHI ◽  
Susumu MINATO
Keyword(s):  
Energy Range ◽  
Gamma Ray ◽  
New Method

scholarly journals A new method optimized to use gamma-ray bursts as cosmic rulers

2005 ◽  
Vol 360 (1) ◽  
pp. L1-L5 ◽  
Author(s):  
C. Firmani ◽  
G. Ghisellini ◽  
G. Ghirlanda ◽  
V. Avila-Reese
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
New Method

scholarly journals UNVEILING THE NATURE OF UNIDENTIFIED GAMMA-RAY SOURCES. I. A NEW METHOD FOR THE ASSOCIATION OF GAMMA-RAY BLAZARS

2013 ◽  
Vol 206 (2) ◽  
pp. 12 ◽  
Author(s):  
R. D'Abrusco ◽  
F. Massaro ◽  
A. Paggi ◽  
N. Masetti ◽  
G. Tosti ◽  
...  
Keyword(s):  
Gamma Ray ◽  
New Method

PSEUDO-3D IMRT VERIFICATION WITH EBT3 RADIOCHROMIC FILM

2019 ◽  
Vol 186 (2-3) ◽  
pp. 362-366
Author(s):  
Tereza Hanušová ◽  
Ivana Horáková ◽  
Irena Koniarová
Keyword(s):  
Radiation Therapy ◽  
Intensity Modulated Radiation Therapy ◽  
New Method ◽  
Radiochromic Film ◽  
Dose Distributions ◽  
Intensity Modulated ◽  
Gamma Analysis ◽  
Gamma Evaluation ◽  
Imrt Verification ◽  
Better Than

Abstract This work proposes a new method for pseudo-3D verification of intensity-modulated radiation therapy (IMRT) dose distributions. Unlike commercial solutions, it uses measured doses only for gamma evaluation. Its resolution is far better than with electronic detectors within the measured plane and comparable in other directions. It is readily available at clinics because it uses existing resources—a slab phantom and EBT3 films. The method was tested on six IMRT clinical cases. An in-house code for 2D and pseudo-3D gamma analysis was written in MATLAB and compared to OmniPro I’mRT.

Computer generation of dose distributions for a fast-neutron therapy beam

1979 ◽  
Vol 6 (1) ◽  
pp. 12-20 ◽  
Author(s):  
P. Shapiro ◽  
L. S. August ◽  
R. B. Theus
Keyword(s):  
Fast Neutron ◽  
Dose Distributions ◽  
Neutron Therapy ◽  
Fast Neutron Therapy ◽  
Computer Generation
Sign in / Sign up

Export Citation Format

Share Document