scholarly journals Study on dose rate distribution inside diagnostic X-ray room by using MCNP5 code

2013 ◽  
Vol 16 (4) ◽  
pp. 35-42
Author(s):  
Loan Thi Hong Truong ◽  
Thu Thi Cam Nguyen ◽  
Hien Thi Doan ◽  
Khanh Ai Tran ◽  
Dung Thi Thuy Vo ◽  
...  
Keyword(s):  
Dose Rate ◽  
Radiation Safety ◽  
Absorbed Dose ◽  
Absorbed Dose Rate ◽  
Rate Distribution ◽  
X Ray ◽  
Room Size ◽  
Exact Determination ◽  
Mcnp5 Code

In this paper, the scattering influence on image quality and radiation safety because of changing room size was studied. To estimate the radiation safety in X-ray room, the exact determination of dose rate distribution inside the room and absorbed dose rate for patient is the first task. The authors simulated the dose rate distribution inside diagnostic X-ray room at Nhi Dong hospital with using MCNP5 code. The dependence of dose rate distribution on various peak voltages of X-ray tube was also investigated in this study

Elektrische Leitfähigkeitsmessungen und Bestimmung des G(freie Ionen)-Wertes bei röntgenbestrahlten Flüssigkeiten verschiedener Molekularstruktur

1968 ◽  
Vol 23 (2) ◽  
pp. 126-133 ◽  
Author(s):  
Werner F. Schmidt
Keyword(s):  
Electrical Conductivity ◽  
Room Temperature ◽  
Absorbed Dose ◽  
Recombination Coefficient ◽  
Conductivity Measurements ◽  
Absorbed Dose Rate ◽  
X Ray ◽  
Free Ions ◽  
Radiation Induced

Electrical conductivity measurements were made for the determination of G (free ions) in some hydrocarbons. The radiation source was a x-ray tube operated at 55 kV. Four quantities were measured for each liquid: 1. the stationary electrical conductivity at low electric field strength during irradiation, 2. the mobilities of the radiation-induced ions, 3. the volume recombination coefficient, and 4. the absorbed dose rate.All measurements were performed with aerated liquids at room temperature. The following G-values were obtained: n-pentane 0,1; n-hexane and n-heptane 0,09; iso-octane 0,11; cyclohexane 0,06; benzene 0,07; decalin 0,04. The standard deviation was estimated to ± 25 per cent.

scholarly journals Investigation of tube parameters on Xray spectra by MCNP5 code

2013 ◽  
Vol 16 (4) ◽  
pp. 20-25
Author(s):  
Khanh Ai Tran ◽  
Dung Thi Thuy Vo ◽  
Loan Thi Hong Mai ◽  
Nhon Van Mai ◽  
Phuong Nguyen Dang
Keyword(s):  
Quality Improvement ◽  
Absorbed Dose ◽  
Emission Spectra ◽  
Bremsstrahlung Spectrum ◽  
Dose Estimation ◽  
X Ray ◽  
Image Quality Improvement ◽  
Mcnp5 Code ◽  
Simulation Results

In diagnostic radiology, the determination of bremsstrahlung spectrum is essential for patient absorbed dose estimation and image quality improvement. In this paper, we surveyed the X-ray emission spectra of different peak voltages 50, 70, 85, 125 and 150 kV by using MCNP5 code. Besides, the effects of filter, collimator and anode material on X-ray spectra have also been investigated. The simulation results fairly agree with experimental spectra obtained by P.T. Talla et al. (2009)

Determination of the Absorbed Dose Rate to Water for the 18-mm Helmet of a Gamma Knife

2011 ◽  
Vol 79 (5) ◽  
pp. 1580-1587 ◽  
Author(s):  
Hyun-Tai Chung ◽  
Youngho Park ◽  
Sangil Hyun ◽  
Yongsoo Choi ◽  
Gi Hong Kim ◽  
...  
Keyword(s):  
Dose Rate ◽  
Gamma Knife ◽  
Absorbed Dose ◽  
Absorbed Dose Rate

RADIATION PROTECTION IN THE RELEASE OF PATIENTS RECEIVING 131I TREATMENT

2019 ◽  
Vol 187 (4) ◽  
pp. 499-508
Author(s):  
Essam Mattar ◽  
Musheera A Salih ◽  
K Alsafi ◽  
I I Suliman
Keyword(s):  
Thyroid Cancer ◽  
Dose Rate ◽  
Radiation Protection ◽  
Radiation Safety ◽  
Absorbed Dose ◽  
Absorbed Dose Rate ◽  
Release Times ◽  
131I Treatment ◽  
Radiation Measurements ◽  
Administered Activity

Abstract Radiation measurements were made to support radiation protection decisions and instructions concerning the release of patients receiving 131I treatment in Sudan. In hyperthyroidism, administered activity ranged from 370 to 1110 MBq (average: 817.8 MBq), and air-absorbed dose rate at 1 m in front of the patients varied from 20 to 66 μGy h−1 (average: 47.0 μGy h−1). For thyroid cancer patients, the administered activity ranged from 3700 to 7400 MBq (average: 4816.2 MBq), and the air-absorbed dose rate at 1 m in front of the patients ranged from 3 to 55 μSv h−1 (average: 19.2 μSv h−1). On average, the contamination activity was highest in the patients’ clothes: 11.0 Bq cm−2, followed by the toilet: 6.6 Bq cm−2 and the front bed: 2.9 Bq cm−2. The estimated release times from the confinement were well with the radiation safety criteria, whereas instruction are given concerning precaution times to limit radiation exposure to family members and co-worker.

scholarly journals Absorbed Dose Rate Distribution in 300 keV Electron Beam Irradiation Field for Waste-gas Purification

RADIOISOTOPES ◽  
2004 ◽  
Vol 53 (2) ◽  
pp. 59-69
Author(s):  
Teruyuki HAKODA ◽  
Hiromi SUNAGA ◽  
Haruki TAKIZAWA ◽  
Koichi HIROTA ◽  
Takuji KOJIMA
Keyword(s):  
Electron Beam ◽  
Dose Rate ◽  
Electron Beam Irradiation ◽  
Absorbed Dose ◽  
Gas Purification ◽  
Beam Irradiation ◽  
Absorbed Dose Rate ◽  
Rate Distribution ◽  
Waste Gas ◽  
Irradiation Field

scholarly journals Physicochemical and radiological characterization of kaolin and its polymerization products

2018 ◽  
Vol 68 (330) ◽  
pp. e155
Author(s):  
M. Ivanović ◽  
Lj. Kljajević ◽  
M. Nenadović ◽  
N. Bundaleski ◽  
I. Vukanac ◽  
...  
Keyword(s):  
Dose Rate ◽  
Photoelectron Spectroscopy ◽  
Specific Activity ◽  
Physicochemical Characterization ◽  
Natural Radionuclide ◽  
Absorbed Dose ◽  
Raw Material ◽  
Absorbed Dose Rate ◽  
X Ray

The aim of this study was determination of physical-chemical and radiological characteristics of kaolin and products of alkali-activated thermally treated kaolin (geopolymer). Also, the objective of presented research was to investigate the possibility of kaolin application as a pigment or as a raw material for obtaining geopolymer materials as a relatively new ones in a building material industry. Physicochemical characterization of one set of samples was conducted using X-ray diffraction (XRD), Fourier transform infra - red (FTIR) and X-ray photoelectron spectroscopy (XPS). Activity concentration of naturally occurring radionuclides in kaolin, metakaolin and geopolymer were determined. The absorbed dose rate (D) and the annual effective dose rate (EDR), calculated in accordance with the UNSCEAR 2000 report, are also presented in this paper. Kaolin was heat-treated on 750oC and specific activity of natural radionuclide in metakaolin increased up to 1.6, while measured specific activities in geopolymer were the lowest.

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