A comparison of X-ray and proton beam low energy secondary electron track structures using the low energy models of Geant4

2011 ◽  
Vol 88 (1-2) ◽  
pp. 164-170 ◽  
Author(s):  
Aimee L. McNamara ◽  
Susanna Guatelli ◽  
Dale A. Prokopovich ◽  
Mark I. Reinhard ◽  
Anatoly B. Rosenfeld
Keyword(s):  
Proton Beam ◽  
Secondary Electron ◽  
Low Energy ◽  
X Ray ◽  
Energy Models ◽  
Electron Track

Possibility of Using a Low-Energy Proton Beam for Particle-Induced X-Ray Emission Microanalysis

1992 ◽  
Vol 131 (3) ◽  
pp. 243 ◽  
Author(s):  
Usama M. El-Ghawi ◽  
Beni M. Bahal ◽  
Salem K. Al-Arbi
Keyword(s):  
Proton Beam ◽  
Low Energy ◽  
X Ray ◽  
Energy Proton

scholarly journals ELEMENTAL ANALYSIS OF AEROSOL SAMPLES USING PIXE TECHNIQUE

2021 ◽  
Vol 9 (5) ◽  
pp. 175-180
Author(s):  
Deepali Modi
Keyword(s):  
Trace Elements ◽  
Data Analysis ◽  
Proton Beam ◽  
Elemental Analysis ◽  
Hpge Detector ◽  
Low Energy ◽  
X Rays ◽  
X Ray ◽  
Minor Elements

In this work a complex study of the capabilities Particle Induced X-Ray emission(PIXE) technique for the determination of minor constituents of aerosol samples has been done.The PIXE experiments were carried out at Cyclotron at Department of Physics, Panjab University Chandigarh using ~2.7MeV proton beam. The X-rays were detected with the help of low energy HPGE detector. Total fifteen samples were collected from various locations in Chandigarh.The minor elements identified in the aerosol samples wereS,Cl,K,Ca,Ti,Cr,Mn,Fe,Ni,Zn,V,Br and Pb. The data analysis was done using GUPIX software to extract the quantity of the trace elements.

Electron behavior in the gaseous environment of the ESEM chamber

1996 ◽  
Vol 54 ◽  
pp. 838-839 ◽  
Author(s):  
S.A. Wight
Keyword(s):  
Secondary Electron ◽  
High Vacuum ◽  
Beam Current ◽  
Chamber Pressure ◽  
Environmental Scanning ◽  
Carbon Block ◽  
Faraday Cup ◽  
X Ray ◽  
Gaseous Environment ◽  
Working Distance

Measurements of electrons striking the sample in the Environmental Scanning Electron Microscope (ESEM) are needed to begin to understand the effect of the presence of the gas on analytical measurements. Accurate beam current is important to x-ray microanalysis and it is typically measured with a faraday cup. A faraday cup (Figure 1) was constructed from a carbon block embedded in non-conductive epoxy with a 45 micrometer bore platinum aperture over the hole. Currents were measured with an electrometer and recorded as instrument parameters were varied.Instrument parameters investigated included working distance, chamber pressure, condenser percentage, and accelerating voltage. The conditions studied were low vacuum with gaseous secondary electron detector (GSED) voltage on; low vacuum with GSED voltage off; and high vacuum (GSED off). The base conditions were 30 kV, 667 Pa (5 Torr) water vapor, 100,000x magnification with the beam centered inside aperture, GSED voltage at 370 VDC, condenser at 50%, and working distance at 19.5 mm. All modifications of instrument parameters were made from these conditions.

scholarly journals Complex magnetism of the two-dimensional antiferromagnetic Ge2F: from a Néel spin-texture to a potential antiferromagnetic skyrmion

RSC Advances ◽  
2021 ◽  
Vol 11 (15) ◽  
pp. 8654-8663
Author(s):  
Fatima Zahra Ramadan ◽  
Flaviano José dos Santos ◽  
Lalla Btissam Drissi ◽  
Samir Lounis
Keyword(s):  
Density Functional Theory ◽  
Magnetic Properties ◽  
Density Functional ◽  
Low Energy ◽  
Two Dimensional ◽  
Functional Theory ◽  
2D Material ◽  
Energy Models ◽  
Spin Texture

Based on density functional theory combined with low-energy models, we explore the magnetic properties of a hybrid atomic-thick two-dimensional (2D) material made of germanene doped with fluorine atoms in a half-fluorinated configuration (Ge2F).

scholarly journals GCT-08. PROTON BEAM RADIOTHERAPY FOR PEDIATRIC AND YOUNG-ADULT PATIENTS WITH INTRACRANIAL GERM CELL TUMOR

2020 ◽  
Vol 22 (Supplement_3) ◽  
pp. iii329-iii329
Author(s):  
Minako Sugiyama ◽  
Takayuki Hashimoto ◽  
Takashi Mori ◽  
Kazuya Hara ◽  
Yukayo Terashita ◽  
...  
Keyword(s):  
Young Adult ◽  
Adverse Events ◽  
Germ Cell ◽  
Cell Count ◽  
Proton Beam ◽  
Adult Patients ◽  
Short Term ◽  
Intracranial Germ Cell Tumor ◽  
X Ray ◽  
Proton Beam Radiotherapy

Abstract BACKGROUND To reduce treatment-related adverse events in pediatric and young-adult patients with brain tumors, proton beam radiotherapy (PBT) has recently been performed instead of conventional X-ray radiotherapy. However, whether PBT is as effective as X-ray radiotherapy has not been sufficiently investigated, especially in patients receiving whole-ventricular irradiation. METHODS We report a retrospective observation of 15 patients with intracranial germ cell tumors (GCT), who received PBT at our institution from April 2014 to September 2019. We evaluated their clinical course, short-term adverse events, and prognosis. RESULTS/ CONCLUSION Fifteen patients (9 males and 6 females; median age 13 years) who received PBT following induction chemotherapy were analyzed. Nine patients received 23.4–27.0 GyE of whole-ventricular irradiation due to GCT in the pituitary gland, pineal body, or hypothalamic area. Three patients received 23.4 GyE of whole-brain irradiation: one of them had boost irradiation for basal ganglia. Three patients received 30.6 GyE of craniospinal irradiation (CSI). Six of the 15 patients experienced nausea (grade 2, according to the CTCAE version 4.0). Four patients, including two who received CSI, showed myelosuppression: decrease in white blood cell count, lymphocyte cell count, and neutrophil count (grade 3). No other severe short-term adverse events of >grade 2 was observed in any of the patients. At a median follow-up of 21 months (2-62 months) after irradiation. all patients are alive without recurrence. Our results may be encouraging and further investigations with a larger scale is warranted.

scholarly journals Combination of Dual-Energy X-ray Transmission and Variable Gas-Ejection for the In-Line Automatic Sorting of Many Types of Scrap in One Measurement

2021 ◽  
Vol 11 (10) ◽  
pp. 4349
Author(s):  
Tianzhong Xiong ◽  
Wenhua Ye ◽  
Xiang Xu
Keyword(s):  
High Efficiency ◽  
Nearest Neighbor ◽  
High Energy ◽  
Dual Energy ◽  
Center Of Gravity ◽  
Low Energy ◽  
Identification Accuracy ◽  
Flow Process ◽  
X Ray ◽  
Automatic Sorting

As an important part of pretreatment before recycling, sorting has a great impact on the quality, efficiency, cost and difficulty of recycling. In this paper, dual-energy X-ray transmission (DE-XRT) combined with variable gas-ejection is used to improve the quality and efficiency of in-line automatic sorting of waste non-ferrous metals. A method was proposed to judge the sorting ability, identify the types, and calculate the mass and center-of-gravity coordinates according to the shading of low-energy, the line scan direction coordinate and transparency natural logarithm ratio of low energy to high energy (R_value). The material identification was satisfied by the nearest neighbor algorithm of effective points in the material range to the R_value calibration surface. The flow-process of identification was also presented. Based on the thickness of the calibration surface, the material mass and center-of-gravity coordinates were calculated. The feasibility of controlling material falling points by variable gas-ejection was analyzed. The experimental verification of self-made materials showed that identification accuracy by count basis was 85%, mass and center-of-gravity coordinates calculation errors were both below 5%. The method proposed features high accuracy, high efficiency, and low operation cost and is of great application value even to other solid waste sorting, such as plastics, glass and ceramics.

Sign in / Sign up

Export Citation Format

Share Document