Measurement of radiation dose distribution in a pond habitat by lithium fluoride dosimetry

1969 ◽  
Vol 47 (1) ◽  
pp. 17-20 ◽  
Author(s):  
J. E. Guthrie ◽  
A. G. Scott
Keyword(s):  
Radiation Dose ◽  
Dose Distribution ◽  
Lithium Fluoride ◽  
Gamma Dose ◽  
Thermoluminescent Dosimetry ◽  
Small Plastic ◽  
Chironomidae Larvae ◽  
Cesium 137

Thermoluminescent dosimetry has been used to measure the radiation dose accumulated by Chironomidae larvae inhabiting a 19-m diameter pond contaminated with cesium-137. Small plastic tubes filled with lithium fluoride powder were arranged in parallel rows along the pond bottom. The accumulated gamma dose was greatest at the pond margin.

Radiation Dose and Somatic Risk from Computed Tomography

1987 ◽  
Vol 28 (4) ◽  
pp. 483-488 ◽  
Author(s):  
K. Faulkner ◽  
B. M. Moores
Keyword(s):  
Computed Tomography ◽  
Radiation Dose ◽  
Male Patient ◽  
Dose Distribution ◽  
Lithium Fluoride ◽  
Central Axis ◽  
Organ Doses ◽  
Ct Examination ◽  
Genetic Risks ◽  
Thermoluminescent Dosemeters

Lithium fluoride (LiF) thermoluminescent dosemeters (TLD) have been employed to measure the radiation dose distribution within a phantom and the central axis dose in air. Results are presented for seven (four EMI CT1010, one EMI CT5005, one EMI CT7070 and one Siemens DR2) different machines. Organ doses for four different computed tomography (CT) investigations (head, lung, liver and pelvis) have been estimated from previously published tables and the central axis dose in air in 3 CT units. These estimated organ doses were used in turn to deduce the somatic and genetic risks for the four types of CT examination. These calculations indicate that for an ‘average’ male patient undergoing a CT examination corresponding to the average conditions encountered, the total somatic risks are 3.15 10−4, 1.98 10−4, 2.31 10−4, and 1.38 10−4 for head, lung, liver and pelvis scans, respectively. The corresponding figures for female patients are 3.39 10−4, 3.95 10−4, 2.73 10−4, and 1.60 10−4. The risk from head scanning is approximately 250 times that of a dental pantomograph. Somatic and genetic risks will be approximately twice as high for contrast examinations.

Evaluation of the gamma dose distribution comparison method

2003 ◽  
Vol 30 (9) ◽  
pp. 2455-2464 ◽  
Author(s):  
Daniel A. Low ◽  
James F. Dempsey
Keyword(s):  
Dose Distribution ◽  
Comparison Method ◽  
Gamma Dose

MEASUREMENT OF INTERNAL RADIATION DOSE DISTRIBUTION IN CT EXAMINATIONS USING POLYETHYLENE TEREPHTHALATE RESIN

2018 ◽  
Vol 181 (4) ◽  
pp. 303-309 ◽  
Author(s):  
C Yamauchi-Kawaura ◽  
S Yamamoto ◽  
K Fujii ◽  
M Komori ◽  
M Yamauchi ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Polyethylene Terephthalate ◽  
Dose Distribution ◽  
Internal Radiation

Modeling the dose distribution in a human brain structure using CT images on the surface of Mars

2020 ◽  
Author(s):  
Salman Khaksarighiri ◽  
Jingnan Guo ◽  
Robert Wimmer-Schweingruber ◽  
Lennart Rostl
Keyword(s):  
Radiation Dose ◽  
Human Brain ◽  
Brain Structure ◽  
Dose Distribution ◽  
Cosmic Radiation ◽  
Cosmic Ray ◽  
Ct Images ◽  
Human Brains ◽  
The Impact ◽  
The Brain

<p>One of the most important steps in the near-future space age will be a manned mission to Mars. Unfortunately, such a mission will cause astronauts to be exposed to unavoidable cosmic radiation in deep space and on the surface of Mars. Thus a better understanding of the radiation environment for a Mars mission and the consequent biological impacts on humans, in particular the human brains, is critical. To investigate the impact of cosmic radiation on human brains and the potential influence on the brain functions, we model and study the cosmic particle-induced radiation dose in a realistic head structure. Specifically speaking, 134 slices of computed tomography (CT) images of an actual human head have been used as a 3D phantom in Geant4 (GEometry ANd Tracking) which is a Monte Carlo tool simulating energetic particles impinging into different parts of the brain and deliver radiation dose therein. As a first step, we compare the influence of different brain structures (e.g., with or without bones, with or without soft tissues) to the resulting dose therein to demonstrate the necessity of using a realistic brain structure for our investigation. Afterwards, we calculate energy-dependent functions of dose distribution for the most important (most abundant and most biologically-relevant) particle types encountered in space and on Mars such as protons, Helium ions and neutrons. These functions are then used to fold with Galactic Cosmic Ray (GCR) spectra on the surface of Mars for obtaining the dose rate distribution at different lobes of the human brain. Different GCR spectra during various solar cycle conditions have also been studied and compared.</p>

Physical Analysis of Radiation Dose Distribution by Using Cerrobend Compensator-Based IMRT in Linac 6 MV

2017 ◽  
Vol 23 (7) ◽  
pp. 6630-6634
Author(s):  
Sanggam Ramantisan ◽  
Suryono Suryono ◽  
Heri Sutanto
Keyword(s):  
Radiation Dose ◽  
Dose Distribution ◽  
Physical Analysis
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