Semi-Empirical LET Descriptions of Heavy Ions Used in the European Component Irradiation Facilities

2010 ◽  
Vol 57 (4) ◽  
pp. 1946-1949 ◽  
Author(s):  
Arto Javanainen ◽  
Wladyslaw Henryk Trzaska ◽  
Reno Harboe-Sørensen ◽  
Ari Virtanen ◽  
Guy Berger ◽  
...  
Keyword(s):  
Heavy Ions ◽  
Semi Empirical ◽  
Irradiation Facilities

Energy Loss for Swift Heavy Ions in Different Elemental Absorbers: A Different Approach for Effective Charge Parameterization

2015 ◽  
Vol 238 ◽  
pp. 196-205
Author(s):  
B. Rani ◽  
Kalpana Sharma ◽  
Neetu ◽  
Anupam ◽  
Shyam Kumar ◽  
...  
Keyword(s):  
Experimental Data ◽  
Energy Loss ◽  
Effective Charge ◽  
Heavy Ions ◽  
Close Agreement ◽  
Input Parameter ◽  
Quantum Mechanical ◽  
Swift Heavy Ions ◽  
Calculated Energy ◽  
Semi Empirical

The energy loss for swift heavy ions, covering Z=3-29(~0.2 - 5.0MeV/n), has been calculated in the elemental absorbers like C, Al and Ti. The present calculations are based on Bohr’s approach applicable in both classical and quantum mechanical regimes. The major input parameter, the effective charge, has been calculated in a different way without any empirical/semi-empirical parameterization. The calculated energy loss values have been compared with the available experimental data which results in a close agreement.

scholarly journals Calculation of Stopping Power and Range of Nitrogen Ions with the Skin Tissue in the Energies of (1-1000) MeV

2018 ◽  
Vol 31 (2) ◽  
pp. 69
Author(s):  
Saad Nafea Yaqoob ◽  
Bashair Mohammed Saied
Keyword(s):  
Energy Range ◽  
Heavy Ions ◽  
Stopping Power ◽  
Skin Tissue ◽  
Collateral Damage ◽  
Empirical Formulas ◽  
Maximum Value ◽  
Maximum Range ◽  
Nitrogen Ions ◽  
Semi Empirical

       The use of heavy ions in the treatment of cancer tumors allows for accurate radiation of the tumor with minimal collateral damage that may affect the healthy tissue surrounding the infected tissue. For this purpose, the stopping power and the range to which these particles achieved of  Nitrogen (N) in the skin tissue  were calculated by programs SRIM (The Stopping and Range of Ions in Matter),(SRIM Dictionary) [1],(CaSP)(Convolution  approximation for Swift Particles )[2]which are famous programs to calculate stopping power of material and Bethe formula , in the energy range (1 - 1000) MeV .Then  the semi - empirical formulas to calculate the stopping power and range of Nitrogen ions in the skin tissue were founded from fitting for average the values which calculated by using these programs using (MATLAB2016) program,the maximum value of energy for Nitrogen ions can lose along its path in skin tissue is founded and the  range correspond to this value, the maximum range for Nitrogen ions can be reached in the skin tissue is founded too .The importance of the research is to know the data of thes particles and their use in treatment without causing a bad effect on the patient.  

Heavy Ion Range Measurements in SSNTD Materials: A Review

2015 ◽  
Vol 238 ◽  
pp. 174-195
Author(s):  
P.K. Diwan ◽  
Hardev Singh Virk
Keyword(s):  
Solid State ◽  
Heavy Ions ◽  
Reliability And Validity ◽  
Heavy Ion ◽  
Measurement Methods ◽  
Range Measurements ◽  
Measured Range ◽  
Anisotropic Behaviour ◽  
Almost All ◽  
Semi Empirical

Range of heavy ion is one of the important parameters and understanding of this parameter is highly essential in almost all those experiments where heavy ions are used. The present review deals with the range measurements of different heavy ions through solid state nuclear track detectors (SSNTDs) technique. The importance of SSNTD technique as compared to other techniques is highlighted and different methods/models proposed for range measurements are described. An attempt has been made to compile the measured range values for heavy ions from H4to U238in different classes of SSNTD materials viz. polymers, glasses and minerals, from the available literature. An inter-comparison between the measured range values of different laboratories and through different range measurement methods has been made. Further, the reliability and validity of most commonly used theoretical and semi-empirical/empirical range formulations, through comparison with the measured range, are highlighted. Furthermore, the isotropic and anisotropic behaviour in polymers and minerals through range measurements has been described.Contents of Paper

scholarly journals Luminescence Response and Quenching Models for Heavy Ions of 0.5 keV to 1 GeV/n in Liquid Argon and Xenon

Instruments ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 5
Author(s):  
Akira Hitachi
Keyword(s):  
Heavy Ions ◽  
Massive Particle ◽  
Liquid Argon ◽  
Zero Field ◽  
Empirical Theory ◽  
Ion Energy ◽  
Α Decay ◽  
Quenching Factor ◽  
Semi Empirical ◽  
Direct Dark Matter

Biexcitonic collision kinetics with prescribed diffusion in the ion track core have been applied for scintillation response due to heavy ions in liquid argon. The quenching factors q = EL/E, where E is the ion energy and EL is the energy expended for luminescence, for 33.5 MeV/n 18O and 31.9 MeV/n 36Ar ions in liquid Ar at zero field are found to be 0.73 and 0.46, compared with measured values of 0.59 and 0.46, respectively. The quenching model is also applied for 80–200 keV Pb recoils in α-decay, background candidates in direct dark matter searches, in liquid argon. Values obtained are ~0.09. A particular feature of Birks’ law has been found and exploited in evaluating the electronic quenching factor qel in liquid Xe. The total quenching factors qT for 0.5–20 keV Xe recoils needed for weakly interacting massive particle (WIMP) searches are estimated to be ~0.12–0.14, and those for Pb recoils of 103 and 169 keV are 0.08 and 0.09, respectively. In the calculation, the nuclear quenching factor qnc = Eη/E, where Eη is the energy available for the electronic excitation, is obtained by Lindhard theory and a semi-empirical theory by Ling and Knipp. The electronic linear energy transfer plays a key role.

A semi-empirical model of linear energy transfer for heavy ions and electron

2012 ◽  
Vol 245 ◽  
pp. 202-205 ◽  
Author(s):  
Baojun Liu ◽  
Li Cai ◽  
Xiaokuo Yang ◽  
Xiaohui Zhao ◽  
Hongtu Huang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Empirical Model ◽  
Linear Energy Transfer ◽  
Heavy Ions ◽  
Semi Empirical

Specimen Preparation of Near Surface Ion Irradiated Samples

1985 ◽  
Vol 43 ◽  
pp. 170-171
Author(s):  
K. F. Russell ◽  
L. L. Horton
Keyword(s):  
Radiation Damage ◽  
Heavy Ions ◽  
Target Material ◽  
Metal Alloys ◽  
Specimen Surface ◽  
Specimen Preparation ◽  
Particle Accelerators ◽  
Near Surface ◽  
Graaff Accelerator ◽  
Van De Graaff

Beams of heavy ions from particle accelerators are used to produce radiation damage in metal alloys. The damaged layer extends several microns below the surface of the specimen with the maximum damage and depth dependent upon the energy of the ions, type of ions, and target material. Using 4 MeV heavy ions from a Van de Graaff accelerator causes peak damage approximately 1 μm below the specimen surface. To study this area, it is necessary to remove a thickness of approximately 1 μm of damaged metal from the surface (referred to as “sectioning“) and to electropolish this region to electron transparency from the unirradiated surface (referred to as “backthinning“). We have developed electropolishing techniques to obtain electron transparent regions at any depth below the surface of a standard TEM disk. These techniques may be applied wherever TEM information is needed at a specific subsurface position.

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