scholarly journals Measurement of mass attenuation coefficients of the fabricated Rhizophora spp. particleboards at high energy photons by using Compton scattering method

2019 ◽  
Vol 555 ◽  
pp. 012029
Author(s):  
M F Mohd Yusof ◽  
P N K Abd Hamid ◽  
N Mohd Isa ◽  
A B Abd Kadir ◽  
H Salleh
Keyword(s):  
Compton Scattering ◽  
High Energy ◽  
Scattering Method ◽  
Attenuation Coefficients ◽  
Mass Attenuation Coefficients ◽  
Mass Attenuation

Measurement of Mass Attenuation Coefficients of Blue Sapphire at Different Photon Energy by Compton Scattering Technique

2011 ◽  
Vol 103 ◽  
pp. 71-75 ◽  
Author(s):  
Jakrapong Kaewkhao ◽  
P. Lofimkitjaroenporn ◽  
S. Tuscharoen ◽  
T. Kittiauchawal ◽  
W. Chewpraditkul ◽  
...  
Keyword(s):  
Compton Scattering ◽  
Attenuation Coefficient ◽  
Gamma Rays ◽  
Mass Attenuation Coefficient ◽  
Attenuation Coefficients ◽  
Scattering Technique ◽  
Mass Attenuation Coefficients ◽  
Experimental Values ◽  
Good Agreement ◽  
Mass Attenuation

The mass attenuation coefficients of blue sapphire were measured at the different energy of γ-rays using the Compton scattering technique. There are in good agreement of scattered gamma rays energies between theoretical value and experimental value, reflecting the validation of Compton scattering system setup. The results show that, the experimental values of mass attenuation coefficient are in good agreement with the theoretical values. The mass attenuation coefficients increase with the decrease in gamma rays energies. This may be attributed to the higher photon interaction probability of blue sapphire at lower energy. This result is a first report of mass attenuation coefficient of blue sapphire at different gamma rays energies.

scholarly journals Control of spectral characteristics of the medical accelerator on the basis of comparison of mass weaking coefficients of different materials

2021 ◽  
Vol 29 (3) ◽  
pp. 9-21
Author(s):  
I.Yu. Chernіavskіy ◽  
V.P. Starenky ◽  
A.S. Makienko ◽  
L.O. Averyanova ◽  
O.O. Petrychenko ◽  
...  
Keyword(s):  
Linear Accelerator ◽  
High Energy ◽  
Pulse Mode ◽  
Linear Electron ◽  
Diagnostic Equipment ◽  
Attenuation Coefficients ◽  
Measured Energy ◽  
Mass Attenuation Coefficients ◽  
Spectrum Characteristics ◽  
Mass Attenuation

Background. Radiation protection of patients undergoing radiation therapy using linear electron accelerators is based on ensuring the constancy of the equipment parameters set during commissioning. Therefore, studying the possibility of operational assessment of the spectrum characteristics consistency of the generated bremsstrahlung is a priority along with standard dosimetric parameter control procedures. Primarily, this refers to specifying the average measured energy of bremsstrahlung which provides an impartial assessment of the constancy of the whole wave path of the accelerator. However, there is no special diagnostic equipment to determine this parameter. At the same time, the literature data represent a growing interest in the use of CdTe sensors for the analysis of high-energy radiation, including the ones in medical accelerators. Purpose – developing and testing special diagnostic equipment based on semiconductor CdTe sensors, which would implement the assessment of the average measured energy of bremsstrahlung of the medical accelerator 6 MeV via comparing the mass attenuation coefficients in lead and aluminum. Materials and Methods. The paper deals with experimental evaluation of the Varian Clinac 600C linear accelerator (USA) spectrum characteristics carried out at Radiation Oncology Department of State Organization «Grigoriev Institute for Medical Radiology and Oncology of the National Academy of Medical Sciences of Ukraine» via determining the average measured energy of bremsstrahlung. The assessment of the average measured energy of the bremsstrahlung of the accelerator was performed based on comparing two mass attenuation coefficients of radiation with materials having significantly different atomic numbers, i.e. Al and Pb. The assessment of the mass attenuation coefficients was performed on the basis of measuring the average amplitudes of CdTe signals of the sensor, operating in the pulse mode in conjunction with a 16-bit ADC. Pulses of bremsstrahlung from the linear accelerator were recorded by a peak detector for 10 seconds of measurement by the hardware-software complex at 400 monitor units by CdTe sensor with aluminum and lead absorber. The study was performed at a distance of «source-surface» 100 cm with an area of the irradiation field of 20x20 cm. The spectral energy profile of the generated field of bremsstrahlung was studied. Results. The developed equipment was tested by CdTe sensor, which was created taking into account the energy sensitivity of the sensor itself as well as the spectraltemporal characteristics of the pulsed radiation of the accelerator. The approach dealing with assessing the average measured energy of bremsstrahlung of the linear electron accelerator, based on the dependence of the attenuation of radiation by the absorber layer on the radiation energy, has been experimentally confirmed. The theoretical dependence of the average measured energy of bremsstrahlung of the linear accelerator on the ratio of the mass attenuation coefficients of lead and aluminum has been obtained. The energy range from 0.1 to 6 MeV corresponds to the ratio of mass absorption coefficients of lead to aluminum, varying nonlinearly from 33.8 to 1.639. The average measured energy of the linear accelerator of 0.8 MeV corresponds to a mass coefficient ratio of about 1.23 for these materials. The assessed absolute error (from the set value during commissioning the linear accelerator) of the specified measured average energy of bremsstrahlung is up to 12.5% (0.72 MeV), corresponding to the ratio of mass attenuation coefficients – 1.340. Conclusions. The special diagnostic equipment for recording the spectrum characteristics of the Varian Clinac 600C linear accelerator (USA) based on semiconductor CdTe sensors, which along with 16-bit ADC make it possible to estimate the average measured energy of bremsstrahlung via comparing mass attenuation coefficients in Al and Pb has been substantiated and reduced to practice. The assessment of mass attenuation coefficients is carried out based on measuring the average amplitudes of pulses of СdTe sensors operating in a pulse mode.

Comparison of mass attenuation coefficients of concretes using FLUKA, XCOM and experiment results

2018 ◽  
Vol 53 (2) ◽  
pp. 145-148 ◽  
Author(s):  
V.P. Singh ◽  
T. Korkut ◽  
N.M. Badiger
Keyword(s):  
Monte Carlo ◽  
Gamma Ray ◽  
High Energy ◽  
Steel Scrap ◽  
Linear Attenuation Coefficient ◽  
Monte Carlo Code ◽  
Attenuation Coefficients ◽  
Energy Gamma ◽  
Mass Attenuation Coefficients ◽  
Mass Attenuation

The mass attenuation coefficients of seven different types of normal and heavy concretes like ordinary, hematite-serpentine, ilmenite-limonite, basalt-magnetite, ilmenite, steel-scrap and steel-magnetite concretes has been simulated using FLUKA Monte Carlo code at high energies 1.5, 2, 3, 4, 5 and 6 MeV. The mass attenuation coefficients and linear attenuation coefficient of the concretes were found dependent upon the chemical composition, density and gamma ray energy. FLUKA Monte Carlo code results were found in good agreement with experimental and theoretical XCOM data. Our investigations for high energy gamma-ray interaction validate the FLUKA Monte Carlo code for use where experimental gamma-ray interaction results are not available.

Use of Primary Beam Filtration in Estimating Mass Attenuation Coefficients by Compton Scattering

1984 ◽  
Vol 28 ◽  
pp. 25-30
Author(s):  
B. H. O'Connor ◽  
W–J. Chang
Keyword(s):  
Compton Scattering ◽  
Absorption Edge ◽  
Systematic Errors ◽  
Primary Beam ◽  
Compton Wavelength ◽  
Attenuation Coefficients ◽  
X Ray ◽  
Mass Attenuation Coefficients ◽  
Beam Filter ◽  
Mass Attenuation

AbstractMass attenuation coefficients (MACs) are frequently estimated over a range of wavelengths in x-ray spectrometry from the intensity of the Compton peak IC associated with a prominent tube line. The MAC μλ at wavelength λ is estimated from the MAC at the Compton wavelength λC with the approximations μλ α μC and μC α 1/IC. Systematic errors may introduce absorption edge bias (AEB) effects into the results, caused by sample components vith absorption edges between λc and λ. A procedure is described which eliminates AEB effects by measuring IC using emission radiation from a primary beam filter.

Wavelength-independent Microradiography: A Method for Non-destructive Quantification of Enamel and Dentin Mineral Concentrations using Polychromatic X-rays

1990 ◽  
Vol 69 (8) ◽  
pp. 1522-1526 ◽  
Author(s):  
F.M. Herkströter ◽  
J.J. Ten Bosch
Keyword(s):  
Mass Attenuation Coefficient ◽  
High Energy ◽  
X Rays ◽  
Tube Voltage ◽  
Attenuation Coefficients ◽  
Mass Attenuation Coefficients ◽  
Mineral Concentrations ◽  
Non Destructive ◽  
Mass Attenuation

Wavelength-independent Microradiography (WIM), described in this paper, used polychromatic, high-energy (≤ 60 kV) x-rays for determination of mineral concentrations in tooth material non-destructively. This was done with the aid of a reference step-wedge made of 94% aluminum, 6% zinc. The mass attenuation coefficient of this material has a wavelength-independent ratio to the mass attenuation coefficients of enamel and dentin. With this method, mineral concentrations of enamel and dentin samples, with a thickness up to 500 μm, were determined at 20- and at 60-kV tube voltage. The samples were demineralized for 72 and 144 h and measured again. Comparison of the data showed that mineral quantification was within 1.5%, independent of the x-rays used. Finally, these mineral concentrations-obtained from the Wavelength-independent Microradiography-were compared with measurements of the same samples by Longitudinal Microradiography. A correlation of 0.99 was found for enamel and one of 0.96 for dentin.

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