Z dependence of photon interactions in wood materials

2013 ◽  
Vol 91 (3) ◽  
pp. 221-225 ◽  
Author(s):  
B. Saritha ◽  
A.S. Nageswara Rao
Keyword(s):  
Gamma Ray ◽  
Mass Attenuation Coefficient ◽  
Narrow Beam ◽  
Attenuation Coefficients ◽  
Beam Geometry ◽  
Mass Attenuation Coefficients ◽  
Experimental Values ◽  
Photon Interactions ◽  
Good Agreement ◽  
Mass Attenuation

Transmission experiments were performed on wood in a narrow-beam geometry using a collimated gamma ray beam at 59.5 and 661.6 keV. The mass attenuation coefficients were determined from experiment, and effective atomic numbers were computed from theoretical equations. It was found that the mass attenuation coefficient decreases with increasing photon energy. Experimental values were compared with those from the XCOM database and with analytical results, and good agreement was achieved. This type of study gives some insight about photon interactions with wood materials.

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.

Determination of attenuation coefficients of some wood materials based on thickness and chemical composition

2014 ◽  
Vol 92 (9) ◽  
pp. 968-972 ◽  
Author(s):  
B. Saritha ◽  
A.S. Nageswara Rao
Keyword(s):  
Andhra Pradesh ◽  
Gamma Ray ◽  
Mass Attenuation Coefficient ◽  
Gamma Ray Spectrometry ◽  
Attenuation Coefficients ◽  
Different Types ◽  
Mass Attenuation Coefficients ◽  
Experimental Values ◽  
Mass Attenuation

The variation of linear attenuation coefficients with the densities of different samples is investigated in this paper. For this study, different types of soft wood and hard wood samples were collected from the Pakal forest area of the Warangal district, Andhra Pradesh, India. The linear and mass attenuation coefficients of different wood samples are measured using gamma ray spectrometry based on NaI(Tl) scintillation detector at the gamma ray energies of 661.6 and 59.5 keV. The experimental values of mass attenuation coefficient are compared with that of XCOM data based tool. Figures show the variation of mass attenuation coefficients of wood materials against the absorber thickness (number of mean free paths). From the numerical values, it is inferred that the large thickness of the samples reduces the scattered photons reaching the detector by decreasing the scattering angle.

Determination of LIII subshell photoelectric parameters of iridium

2017 ◽  
Vol 95 (5) ◽  
pp. 427-431
Author(s):  
Erhan Cengiz
Keyword(s):  
Form Factor ◽  
Cross Section ◽  
Narrow Beam ◽  
Attenuation Coefficients ◽  
X Ray ◽  
Beam Geometry ◽  
Mass Attenuation Coefficients ◽  
Photoelectric Cross Section ◽  
Mass Attenuation

The LIII subshell photoelectric cross section, jump ratio, jump factor, and Davisson–Kirchner ratio of iridium have been determined by mass attenuation coefficients. The measurements have been performed using the X-ray attenuation method in narrow beam geometry. The obtained results have been compared with the tabulated values of XCOM (Berger et al. XCOM: Photon cross section database (version 1.3). NIST. Available at http://physics.nist.gov/xcom . 2005) and FFAST (Chantler et al. X-ray form factor, attenuation and scattering tables (version 2.1). NIST. Available at http://physics.nist.gov/ffast . 2005).

The Mass Attenuation Coefficients and Effective Atomic Numbers of Ruby from Vietnam at Different Photon Energies

2013 ◽  
Vol 770 ◽  
pp. 287-290 ◽  
Author(s):  
Pruittipol Limkitjaroenporn ◽  
Suparat Tuscharoen ◽  
Jakrapong Kaewkhao
Keyword(s):  
X Rays ◽  
Attenuation Coefficients ◽  
Γ Rays ◽  
Mass Attenuation Coefficients ◽  
Effective Atomic Numbers ◽  
Experimental Values ◽  
Fluorescence Spectrometer ◽  
Interaction Probability ◽  
Good Agreement ◽  
Mass Attenuation

The mass attenuation coefficients and effective atomic numbers of ruby from Vietnam were measured at the different energy of γ-rays using the Compton scattering technique. The compositions of ruby were analyzed by energy dispersive x-rays fluorescence spectrometer and showed the Al2O3 is major composition. The results of the experimental values of mass attenuation coefficients and effective atomic numbers showed the good agreement with the theoretical values. The mass attenuation coefficients decreased with the increasing in gamma rays energies, due to the higher photon interaction probability of ruby at lower energy. The effective atomic numbers found to be constant around 10.0 electrons/atom.

scholarly journals Measuring Mass Attenuation Coefficient and Elemental Composition for Egbeda Soil Series of Southwestern Nigeria

2021 ◽  
Vol 9 (04) ◽  
pp. 01-10
Author(s):  
Fajemiroye, Joseph Ademola
Keyword(s):  
Elemental Composition ◽  
Attenuation Coefficient ◽  
Production Efficiency ◽  
Gamma Ray ◽  
Soil Depth ◽  
Mass Attenuation Coefficient ◽  
Soil Series ◽  
Attenuation Coefficients ◽  
Mass Attenuation Coefficients ◽  
Mass Attenuation

Information from workers on the profitability of cassava on Iwo and Egbeda soil series in Oyo state, Nigeria have shown the Iwo soil series to be more profitable given the same scale of cassava cultivation. Therefore the need arises to improve on the soil properties of Egbeda soil series which will possibly improve the production efficiency for this category of farmers. In this work, an experimental procedure using gamma attenuation technique to determine the mass attenuation coefficient at different gamma ray energies of 59.5, 661.7, 1173.2 and 1332.5 keV, and at depths of 0 – 15, 15 – 30, 30 – 45, 45 – 60, 60 – 75 and 75 – 90 cm into the Egbeda soil series profile have been studied. Likewise X-ray fluorescence, XRF, method was used to obtain the elemental composition and concentrations at these depths while the XCOM software was applied to obtain the photon mass attenuation coefficients at the different gamma ray energies for the depths. Mass attenuation coefficients,  obtained experimentally and that computed theoretically using XCOM varied exponentially with photon energy. The correlation coefficient between the experimentally-obtained and XCOM-obtained μs for the energies considered ranged from 0.89 – 0.96. The variation of  with soil depth show that the top soil (0 – 15cm depths) is least attenuating with gamma ray penetrability varying down the profile. Information on the mass attenuation coefficients, elemental composition, and concentrations at varying depths into the soil profile will go a long way in contributing to efforts at improving the soil condition of the Egbeda soil series.  

scholarly journals Theoretical and experimental determination of mass attenuation coefficients of lead-based ceramics and their comparison with simulation

2016 ◽  
Vol 31 (2) ◽  
pp. 142-149 ◽  
Author(s):  
Alireza Vejdani-Noghreiyan ◽  
Elham Aliakbari ◽  
Atiyeh Ebrahimi-Khankook ◽  
Mahdi Ghasemifard
Keyword(s):  
Gamma Ray ◽  
Mass Attenuation Coefficient ◽  
X Ray Diffraction ◽  
Attenuation Coefficients ◽  
X Ray ◽  
Simulation Results ◽  
Theoretical Results ◽  
Good Agreement ◽  
Mass Attenuation

Mass attenuation coefficient of lead-based ceramics have been measured by experimental methods and compared with theoretical and Monte Carlo simulation results. Lead-based ceramics were prepared using mixed oxide method and the X-ray diffraction analysis was done to evaluate the crystal structure of the produced handmade ceramics. The experimental results show good agreement with theoretical and simulation results. However at two gamma ray energies, small differences between experimental and theoretical results have been observed. By adding other additives to ceramics and observing the changes in the shielding properties such as flexibility, one can synthesize and optimize ceramics as a neutron shield.

Determination of Mass Attenuation Coefficients of Cement Paste Containing Ilmenite and Barite for γ-Rays

2018 ◽  
Vol 879 ◽  
pp. 156-160 ◽  
Author(s):  
Sarawut Jaiyen ◽  
Akapong Phunpueok ◽  
Ruamporn Potong
Keyword(s):  
Cement Paste ◽  
Gamma Ray ◽  
Mass Attenuation Coefficient ◽  
Radioactive Isotopes ◽  
Transmission Method ◽  
Attenuation Coefficients ◽  
Result Show ◽  
Mass Attenuation Coefficients ◽  
Beam Transmission ◽  
Mass Attenuation

The gamma ray shielding properties of cement paste containing ilmenite and barite (BaSO4) at different concentration were investigated using beam transmission method for 59.5 keV gamma ray energy of 241Am radioactive isotopes by using NaI(Tl) scintillation detector. The mass attenuation coefficients (μm) of these shielding materials were calculated. It was found that the mass attenuation coefficients increase with increasing of ilmenite and barite content up to a value of 60% by weight. The highest value of μm was 0.425 ± 0.003 cm2/g for cement paste containing ilmenite and 1.598 ± 0.039 cm2/g for the cement paste containing barite. The mass attenuation coefficient values were compared between cement pasted containing ilmenite and barite. The result show that cement paste containing barite showed good gamma ray shielding performances than that for the cement paste containing ilmenite.

Theoretical Study of the Photon Interaction for Zirconium Alloy at 1 keV to 100 MeV

2016 ◽  
Vol 675-676 ◽  
pp. 730-733
Author(s):  
Chumphon Khobkham ◽  
W. Chaiphaksa ◽  
P. Limkitjaroenporn ◽  
P. Prongsamrong ◽  
P. Wiwatkanjana ◽  
...  
Keyword(s):  
Attenuation Coefficient ◽  
Total Mass ◽  
Zirconium Alloy ◽  
Gamma Ray ◽  
Mass Attenuation Coefficient ◽  
Chemical Compositions ◽  
Electron Densities ◽  
Attenuation Coefficients ◽  
Effective Atomic Numbers ◽  
Mass Attenuation

In this work, the total mass attenuation coefficient and partial interactions of the zirconium alloy have been calculated by WinXCom program at 1 keV-100 MeV gamma ray energies. Zr2(Fe,Ni) alloys was studied for the mass attenuation coefficients, photoelectric absorption, incoherent, coherent and pair production processes. The effective atomic numbers and electron densities were also calculated. The calculated results show that the total mass attenuation coefficient decreased with increasing of gamma rays energy. The value of total mass attenuation coefficient of each material was different, which depend on chemical compositions of alloy. The partials interactions, effective atomic numbers and electron densities were also calculated and discussed.

scholarly journals Photon Atomic Parameters of Nonessential Amino Acids for Radiotherapy and Diagnostics

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Ertuğrul O. Bursalıoğlu ◽  
Orhan İçelli ◽  
Begüm Balkan ◽  
H. Birtan Kavanoz ◽  
Mustafa Okutan
Keyword(s):  
Amino Acids ◽  
Cross Sections ◽  
Total Mass ◽  
Attenuation Coefficients ◽  
Wide Energy ◽  
Mass Attenuation Coefficients ◽  
Photon Interactions ◽  
Nonessential Amino Acids ◽  
Atomic Parameters ◽  
Mass Attenuation

The total mass attenuation coefficients (μt) (cm2/g) and atomic, molecular, and electronic effective cross sections have been calculated for nonessential amino acids that contain H, C, N, and O such as tyrosine, aspartate, glutamine, alanine, asparagine, aspartic acid, cysteine, and glycine in the wide energy region 0.015–15 MeV. The variations with energy of total mass attenuation coefficients and atomic, molecular, and electronic cross sections are shown for all photon interactions.

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