Spatial distribution of the scattered radiation dose from a source of unidirectional ?-quanta in an infinite medium near the source

1964 ◽  
Vol 16 (5) ◽  
pp. 557-559
Author(s):  
V. I. Kukhtevich ◽  
E. S. Matusevich ◽  
L. A. Trykov
Keyword(s):  
Spatial Distribution ◽  
Radiation Dose ◽  
Scattered Radiation ◽  
Infinite Medium

scholarly journals Spatial distribution of gamma radiation dose rates from natural radionuclides and its radiological hazards in sediments along river Iju, Ogun state Nigeria

MethodsX ◽  
2020 ◽  
Vol 7 ◽  
pp. 101086
Author(s):  
Omeje Maxwell ◽  
Adewoyin Olusegun O. ◽  
Joel Emmanuel S. ◽  
Ikechukwu Ijeh B. ◽  
Omeje Uchechukwu A. ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Radiation Dose ◽  
Gamma Radiation ◽  
Natural Radionuclides ◽  
Dose Rates ◽  
Ogun State ◽  
Radiological Hazards ◽  
Gamma Radiation Dose

CAN SCATTER CORRECTION SOFTWARE REPLACE A GRID IN DR PELVIC EXAMINATIONS?

2019 ◽  
Vol 187 (1) ◽  
pp. 8-16 ◽  
Author(s):  
Helle Precht ◽  
Svea Deppe Mørup ◽  
Anders Tingberg ◽  
Claus Bjørn Outzen ◽  
Kirsten Weber Kusk ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Scattered Radiation ◽  
Scatter Correction ◽  
Pelvic Examination ◽  
Analysis Software ◽  
Visual Grading ◽  
Diagnostic Use ◽  
Visual Grading Analysis ◽  
Exposure Levels

Abstract The purpose was to examine if scatter correction software could replace a grid while maintaining image quality and reducing radiation dose for pelvic DR examinations. Grid images was produced with 70 kV and 16mAs. Anthropomorphic- and Contrast Detail RADiography (CDRAD) non-grid images were produced with 60 kV, 80 kV and 90 kV combined with five different mAs and scatter correction software. The anthropomorphic images were analyzed by absolute Visual Grading Analysis (VGA). The CDRAD images were analyzed using the CDRAD analysis software. The results showed a total of 54.6% non-grid images were evaluated as unsuitable for diagnostic use by the VGA. The CDRAD grid images showed that the IQF_inv values were significantly different (p = 0.0001) when compared to every group of non-grid images. Hereby, the conclusion stated that the scatter correction software did not compensate for the loss in image quality due to scattered radiation at the exposure levels included in a pelvic examination.

scholarly journals 220Rn (Thoron) Geohazard in Room Air of Earthen Dwellings in Vietnam

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Dương Nguyễn-Thuỳ ◽  
Hướng Nguyễn-Văn ◽  
Jan P. Schimmelmann ◽  
Nguyệt Thị Ánh Nguyễn ◽  
Kelsey Doiron ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Radiation Dose ◽  
Radiation Exposure ◽  
Human Health ◽  
Indoor Air ◽  
Building Materials ◽  
Human Health Risk ◽  
Radiation Hazard ◽  
Inhalation Dose ◽  
Interior Walls

Thoron’s (220Rn) contribution to α-radiation exposure is usually considered negligible compared to that of 222Rn (radon). Despite its short half-life of 55.6 seconds, thoron can be exhaled from porous surface layers of building materials into indoor air where people subsequently inhale radioisotopes, including metallic radioactive progeny. Bare surfaces of dry porous soil with relatively high 232Th content can pose a thoron radiation hazard in indoor air. On northern Vietnam’s Đồng Văn karst plateau, the spatial distribution of thoron was determined in indoor air of traditional earthen and other types of dwellings using portable RAD7 and SARAD® RTM 2200 detectors. “Mud houses” are constructed with local compacted soil and typically do not have any floor or wall coverings (i.e., no plaster, wallpaper, or paint). Detailed measurements in a mud house revealed levels of thoron in room air averaging >500 Bq m-3. The spatial distribution of α-radiation from thoron in indoor air at a distance of about 1 m from interior walls was fairly homogeneous and averaged ~200 Bq m-3. Most concerning, from a human health perspective, were the high thoron concentrations of up to 884 Bq m-3 in sleeping areas near mud walls. The average annual thoron radiation dose to inhabitants of mud houses was estimated based on 13 hours of daily occupancy, including daily activities and sleeping. The estimated average thoron inhalation dose of 27.1 mSv a-1 during sleeping hours near mud surfaces accounts for nearly 75% of the total estimated radon and thoron inhalation dose of 37.4 mSv a-1 from indoor mud house air. Our conservative annual radiation dose estimates do not include subsequent radiation from inhaled metallic progeny of thoron. Our data demonstrate a significant human health risk from radiation exposure and a critical need for remediation in traditional northern Vietnamese mud house dwellings.

The Dose Constraint Calculation of High Radioactivity Level Waste Canister Surface

2018 ◽  
Author(s):  
Bo Yang ◽  
Qianglin Wei ◽  
Hexi Wu ◽  
Xujia Luo ◽  
Yibao Liu
Keyword(s):  
Spatial Distribution ◽  
Radiation Dose ◽  
Dose Rate ◽  
Radiation Dose Rate ◽  
Temporal And Spatial Distribution ◽  
Limit Value ◽  
Dose Constraint ◽  
Temporal And Spatial ◽  
High Level ◽  
Neutron Dose Rate

Radiation dose and personnel protection are among the safety goals of geological disposal of high-level radioactive waste. The calculation of the dose field on the surface of the packaging container is of great significance for the research on the dose constraint value of the repository. This paper built model consulting the Sweden KBS-3 canister, the temporal and spatial distribution of the dose rate on canister surface was calculated by Monte Carlo method, the temporal and spatial distribution of radiation dose rate of the tunnel was obtained. The research results showed that the photon dose rate on canister surface was greater than the neutron dose rate by 4 to 6 orders of magnitude, and the dose value of repository tunnel within 100 thousand years was lower than the ICRP recommended dose limit value (0.3 mSv/a) by 5 orders of magnitude.

SU-EE-A4-01: Regional Change in Brain Perfusion, in Irradiated Normal Tissue: Correlation Study Between Perfusion MRI and Spatial Distribution of Radiation Dose Delivered

2005 ◽  
Vol 32 (6Part2) ◽  
pp. 1900-1900
Author(s):  
D Spencer ◽  
C Igna ◽  
I Kay ◽  
A Chan ◽  
Z Kiss ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Radiation Dose ◽  
Normal Tissue ◽  
Brain Perfusion ◽  
Correlation Study ◽  
Perfusion Mri ◽  
Regional Change

SPECTRAL AND SPATIAL DISTRIBUTION OF THE SCATTERED RADIATION OF AN ELECTRON RADIOTHERAPY BEAM

2006 ◽  
Author(s):  
G. BARTESAGHI ◽  
V. CONTI ◽  
V. MASCAGNA ◽  
M. PREST ◽  
A. MOZZANICA ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Scattered Radiation ◽  
Electron Radiotherapy

Interaction of ionizing radiations with matter

2015 ◽  
Author(s):  
Colin J Martin
Keyword(s):  
Radiation Dose ◽  
Scattered Radiation ◽  
Final Section ◽  
Radioactive Decay ◽  
Photoelectric Effect ◽  
X Rays ◽  
X Ray ◽  
Radiation Fields ◽  
Ionizing Radiations ◽  
Radiology Image

Interactions of ionizing radiations with matter are fundamental to the practice of radiation protection. They determine the magnitude and distribution of doses in tissues, the performance of detectors and imaging devices, and the attenuating properties of shielding materials. This chapter describes briefly the processes of radioactive decay and the properties of the various particles emitted, and then goes on to consider the interactions of radiation with matter. Electron interactions with metals result in bremsstrahlung and characteristic X-rays that form the basis of X-ray production. The interaction mechanisms of X-rays with tissue, particularly the photoelectric effect and Compton scattering, are inherent in the process of radiology image formation. Understanding the physics behind X-ray interactions so that scattered radiation can be taken into account is crucial in designing methods for accurately measuring radiation dose parameters. The final section deals with the dose related variables involved in measurement of radiation fields.

scholarly journals Effect of metallic tools on scattered radiation dose during the use of C-arm fluoroscopy in orthopaedic surgery

2018 ◽  
Vol 60 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Ki Hyuk Sung ◽  
Young-Jun Jung ◽  
Hyemi Cha ◽  
Chin Youb Chung ◽  
Kisung Lee ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Scattered Radiation ◽  
Orthopaedic Surgery
Sign in / Sign up

Export Citation Format

Share Document