Collision-kerma conversion between dose-to-tissue and dose-to-water by photon energy-fluence corrections in low-energy brachytherapy

2016 ◽  
Vol 62 (1) ◽  
pp. 146-164 ◽  
Author(s):  
Vicent Giménez-Alventosa ◽  
Paula C G Antunes ◽  
Javier Vijande ◽  
Facundo Ballester ◽  
José Pérez-Calatayud ◽  
...  
Keyword(s):  
Photon Energy ◽  
Low Energy ◽  
Energy Fluence

Photon Interactions Study of Bi2O3-Na2O-CaO-SiO2-B2O3 Glasses

2016 ◽  
Vol 675-676 ◽  
pp. 443-446 ◽  
Author(s):  
Pruittipol Limkitjaroenporn ◽  
Wasu Cheewasukhanont ◽  
Kitipun Boonin ◽  
Jakrapong Kaewkhao
Keyword(s):  
Pair Production ◽  
Attenuation Coefficient ◽  
Photon Energy ◽  
Total Mass ◽  
Mass Attenuation Coefficient ◽  
Low Energy ◽  
Borosilicate Glasses ◽  
Photoelectric Absorption ◽  
Photon Interactions ◽  
Mass Attenuation

The Bi2O3 doped with soda lime borosilicate glasses in composition xBi2O3 : 15Na2O : 10CaO : 20B2O3 : (55-x)SiO2 at different concentrations (x = 0, 5, 10, 15, 20, 25 mol%) were studied the photon interactions. The total mass attenuation coefficient, coherent, incoherent, photoelectric absorption and pair production of prepared were studies using WinXcom Program at 1keV to 2MeV. The result of total mass attenuation coefficient and photoelectric absorption were decreases but discontinue because of photoelectric absorption edge at low energy. The photoelectric effect shows the main interaction at the low energy and decrease with increasing of photon energy. The higher photon energy the incoherent scattering found to be the main interaction. But at the photon energy 1.022 MeV, the pair production will be occurs and found to be the main interaction at the photon energy higher than 1.022 MeV.

scholarly journals Instruments optimizations for low energy Gamma-ray detection

2019 ◽  
Vol 209 ◽  
pp. 01044
Author(s):  
Gonzalo Rodriguez ◽  
Aldo Morselli
Keyword(s):  
Energy Range ◽  
Photon Energy ◽  
Chemical Evolution ◽  
Energy Resolution ◽  
Gamma Ray ◽  
Supernova Explosion ◽  
Low Energy ◽  
Previous Generation ◽  
Energy Gamma ◽  
Better Than

There is an experimental gap in the study of the non-thermal universe in the photon energy range from 0.3 to 100 MeV. We have analyzed the performance of a detector with unprecedented sensitivity, angular and energy resolution and combined with polarimetric capability to study of the most powerful Galactic and extragalactic sources and with a line sensitivity in the MeV energy range two orders of magnitude better than previous generation of instruments that can determine the origin of key isotopes fundamental for the understanding of supernova explosion and the chemical evolution of our Galaxy.

Low energy fluence CO2laser treatment of lymphangiectasia.

1998 ◽  
Vol 39 (4) ◽  
pp. 277-278 ◽  
Author(s):  
Csilla Novak ◽  
Lynda Spelman
Keyword(s):  
Low Energy ◽  
Energy Fluence

scholarly journals Nanoscale dosimetric consequences around bismuth, gold, gadolinium, hafnium, and iridium nanoparticles irradiated by low energy photons

2020 ◽  
Vol 26 (4) ◽  
pp. 225-234
Author(s):  
Asghar Mesbahi ◽  
Elham Mansouri ◽  
Mohammad Mohammadzadeh
Keyword(s):  
Photon Energy ◽  
Low Energy ◽  
Water Medium ◽  
Monte Carlo Code ◽  
Photon Beams ◽  
Electron Dose ◽  
Dose Distributions ◽  
Iridium Nanoparticles ◽  
Nano Scale ◽  
Dose Deposition

AbstractIn the current study, nanoscale physical dose distributions around five potential nanoparticles were compared. Five potential nanoparticles including bismuth, gold, gadolinium, hafnium, and iridium nanoparticles in the form of a sphere with a diameter of 50 nm were simulated in a water medium. The MCNPX (2.7.0) Monte Carlo code with updated libraries was used for calculations of electron dose deposition and electron flux in water from 25 nm up to 4000 nm with a step of 25 nm. Also, secondary electron spectra after irradiation of nanoparticles with mono-energetic photons with energies of 30, 60, 100 keV were derived. The nano-scale distance-dose curves showed a very steep gradient with distance from nanoparticle surface up to 60 nm and after this point, a gradual decrease was seen. The dose deposition characteristics in the nano-scale were dependent on the type of nanoparticle as well as photon energy. Our results concluded that for each photon energy in the energy range of 30-100 keV, a suitable nanoparticle can be selected to boost the effect of energy deposition by low energy photon beams used in brachytherapy.

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