scholarly journals Initial Studies of Electron Beams as a Means of Modifying Collagen

Physics ◽  
2021 ◽  
Vol 3 (2) ◽  
pp. 220-239
Author(s):  
Robert Apsimon ◽  
Sadiq Setiniyaz ◽  
Rebecca Seviour ◽  
William Wise ◽  
Tobias Junginger ◽  
...  
Keyword(s):  
Dose Distribution ◽  
Particle Interaction ◽  
Integrated Design ◽  
Beam Current ◽  
Initial Energy ◽  
Angle Of Incidence ◽  
Beam Particle ◽  
Beam Position ◽  
Depth Dose ◽  
Mechanical Behaviours

We present the initial design studies and specifications for an accelerator and conveyor system to irradiate collagen samples, modifying properties such as the putrescibility and mechanical behaviours in a paradigm shift from existing, widely used technology. We show the integrated design requirements for a magnetic rastering scheme to move the beam position in order to ensure a uniform dose distribution over the full surface of the hide and discuss its dependence on factors such as the size of the hide, the beam current and conveyor speed. We also present initial energy deposition studies using beam particle interaction simulation program G4beamline, in order to determine the numerical beam parameters and angle of incidence needed to ensure a uniform depth-dose distribution throughout the hide thickness.

The Microstructure of Steatite (Protoenstatite)

1985 ◽  
Vol 43 ◽  
pp. 236-237
Author(s):  
W. E. Lee ◽  
A. H. Heuer
Keyword(s):  
High Frequency ◽  
Glass Ceramics ◽  
Magnesium Silicate ◽  
Beam Current ◽  
Glassy Matrix ◽  
Angle Of Incidence ◽  
X Ray ◽  
Mechanical And Electrical Properties ◽  
Argon Ions ◽  
High Temperature Polymorph

IntroductionTraditional steatite ceramics, made by firing (vitrifying) hydrous magnesium silicate, have long been used as insulators for high frequency applications due to their excellent mechanical and electrical properties. Early x-ray and optical analysis of steatites showed that they were composed largely of protoenstatite (MgSiO3) in a glassy matrix. Recent studies of enstatite-containing glass ceramics have revived interest in the polymorphism of enstatite. Three polymorphs exist, two with orthorhombic and one with monoclinic symmetry (ortho, proto and clino enstatite, respectively). Steatite ceramics are of particular interest a they contain the normally unstable high-temperature polymorph, protoenstatite.Experimental3mm diameter discs cut from steatite rods (∼10” long and 0.5” dia.) were ground, polished, dimpled, and ion-thinned to electron transparency using 6KV Argon ions at a beam current of 1 x 10-3 A and a 12° angle of incidence. The discs were coated with carbon prior to TEM examination to minimize charging effects.

Depth-dose Distribution Measurements and Calculations in an Elliptical Phantom

1983 ◽  
Vol 44 (1) ◽  
pp. 35-44
Author(s):  
J. Palfalvi ◽  
L. Koblinger ◽  
P. P. Szabo
Keyword(s):  
Dose Distribution ◽  
Depth Dose ◽  
Depth Dose Distribution

Measurement of depth-dose distribution in electron irradiated materials

1970 ◽  
Vol 21 (5) ◽  
pp. 283-304 ◽  
Author(s):  
John M. Davies ◽  
Bernard McQue
Keyword(s):  
Dose Distribution ◽  
Depth Dose ◽  
Depth Dose Distribution

Electron Depth‐Dose Distribution Measurements in Finite Polystyrene Slabs

1972 ◽  
Vol 43 (7) ◽  
pp. 3191-3202 ◽  
Author(s):  
Marvin Rosenstein ◽  
Harvey Eisen ◽  
Joseph Silverman
Keyword(s):  
Dose Distribution ◽  
Depth Dose ◽  
Depth Dose Distribution

Simulation of Absorbed Dose Distribution In Space Materials

2004 ◽  
Vol 851 ◽  
Author(s):  
Boris A. Briskman
Keyword(s):  
Dose Distribution ◽  
Radiation Spectrum ◽  
Space Vehicle ◽  
Absorbed Dose ◽  
Numerical Characteristic ◽  
Dose Profile ◽  
Depth Dose ◽  
Space Material ◽  
Test Adequacy ◽  
Material Tests

ABSTRACTThe problems of absorbed dose distribution simulation at on-ground space material tests are discussed. Several approaches to such simulation, oriented to increase the test adequacy and economy, are analyzed. Sometimes, it is possible to use quantitative criteria of absorbed dose distribution depending on the specific space vehicle orbit. The assessment of reliable simulation of the radiation spectrum may be made, for example, by introducing a special numerical characteristic of the depth dose profile in a material - depth dose criterion. For this purpose, it is recommended to use the ratio of the exponent index of the depth dose profile (μ) to the density of the material (ρ). In the simplest form, the depth dose profile can be represented as a sum of two exponents. The first depth dose profile applies to a near-the-surface layer of 5 to 10 μm in thickness, and the second to a layer of from 10 μm up to, as a minimum, 100 μm in thickness. The reference values of μ/ρ for typical spectra of ionizing radiation are calculated.

Khảo sát một số đặc tính bức xạ của buồng ion hóa CC13 và diode bán dẫn razor đối với các chùm photon kích thước nhỏ trên máy gia tốc tuyến tính xạ trị Clinac IX

2020 ◽  
Author(s):  
Tu Vu Ngoc
Keyword(s):  
Radiation Field ◽  
Dose Response ◽  
Dose Distribution ◽  
Ionization Chamber ◽  
Field Size ◽  
Photon Beams ◽  
Silicon Diode ◽  
Depth Dose ◽  
The Difference

Purpose: Compare percent depth dose (PDD) and off-center ratio (OCR) measured by the CC13 ionization chamber and the RAZOR silicon diode in small photon beams. Method and Materials: Some dosimetric characteristics, such as PDD, OCR, penumbra and radiation field size, were considered in this study for 2x2, 3x3, and 4x4 cm2 field sizes. We used the CC13 ionization chamber and the RAZOR silicon diode to measure dose distribution with depth along the axis and off-center of the beam. From the results obtained, the team investigated the differences in radiation parameters measured by the two types of probes above. Results: There are significant differences in the radiation parameters investigated for the CC13 ionization chamber and the RAZOR silicon diode, especially the width of penumbra. For PDD curves, the difference is less than 5% from dmax to 30 cm, however the difference becomes greater in the build-up region, which reaches to 33% at the water phatom surface. The width of penumbra measured by CC13 is always larger than that of RAZOR, the ratio of the penumbra width between two detectors is 1.8 and 1.3 for energies of 6 MV and 15 MV, respectively. Conclusion: The RAZOR silicon diode has better dose response than the CC13 ionization chamber for measuring the PDD and the OCR in small photon beams.

Precise beam current measurement for storage ring using beam position monitor

2010 ◽  
Vol 22 (12) ◽  
pp. 2973-2978 ◽  
Author(s):  
冷用斌 Leng Yongbin ◽  
阎映炳 Yan Yingbing ◽  
周伟民 Zhou Weimin ◽  
袁任贤 Yuan Renxian
Keyword(s):  
Storage Ring ◽  
Beam Current ◽  
Current Measurement ◽  
Beam Position Monitor ◽  
Beam Position ◽  
Beam Current Measurement

Comparative Study of Depth Dose Distribution of Fast Neutrons Using Solid State Nuclear Track Detectors

1991 ◽  
Vol 27 (4) ◽  
pp. 202-205
Author(s):  
H. R. Moustafa ◽  
M. S. Abdel-Wahab ◽  
N. El Enany ◽  
S. El Fiki ◽  
M. A. Sharaf ◽  
...  
Keyword(s):  
Solid State ◽  
Comparative Study ◽  
Dose Distribution ◽  
Fast Neutrons ◽  
Nuclear Track Detectors ◽  
Depth Dose ◽  
Depth Dose Distribution
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