scholarly journals /sup 3/He and /sup 20/Ne classical atomic scattering cross sections for theta/sub Lab/ = 90/sup 0/ and 138/sup 0/ using the moliere approximation of the Thomas-Fermi potential. [500 to 5000 eV]

1979 ◽  
Author(s):  
G.C. Nelson
Keyword(s):  
Cross Sections ◽  
Thomas Fermi ◽  
Scattering Cross ◽  
Atomic Scattering ◽  
Scattering Cross Sections

Remarks on the scattering of electrons by atomic fields

1930 ◽  
Vol 26 (4) ◽  
pp. 556-563 ◽  
Author(s):  
E. C. Bullard ◽  
H. S. W. Massey
Keyword(s):  
Angular Distribution ◽  
Atomic Number ◽  
Cross Sections ◽  
Approximate Expression ◽  
Thomas Fermi ◽  
Scattering Cross ◽  
Single Curve ◽  
Scattering Cross Sections

It is shown that, by use of the Thomas-Fermi atom, effective scattering cross-sections may be obtained from a single curve for all atoms (provided that the atomic number is not too small). This curve is calculated. The range of validity of such values has been obtained and Born's formula shown to be inaccurate for representing the scattering of electrons with velocities less than 400 volts except by atoms of very low atomic number. For the case of high velocities an approximate expression is obtained for the angular distribution allowing for screening by the extra-nuclear electrons.

scholarly journals Radiation shielding and gamma ray attenuation properties of some polymers

2017 ◽  
Vol 32 (3) ◽  
pp. 288-293 ◽  
Author(s):  
Rameshwar Bhosale ◽  
Chaitali More ◽  
Dhammajyot Gaikwad ◽  
Pravina Pawar ◽  
Madhav Rode
Keyword(s):  
Cross Sections ◽  
Building Materials ◽  
Gamma Ray ◽  
Ethyl Acrylate ◽  
Radiation Shielding ◽  
Effective Electron ◽  
Scattering Cross ◽  
Atomic Scattering ◽  
Scattering Cross Sections ◽  
Electronic Scattering

In the present work we investigated the gamma radiation parameters as mass attenuation coefficients ?/?, the total atomic scattering cross-sections ??, the electronic scattering cross-sections se, the effective atomic numbers Zeff, and the effective electron densities Neff for some polymers such as polyoxymethylene (CH2O), poly acrylonitrile (C3H3N), natural rubber (C5H8), poly ethyl acrylate (C5H8O2), polyphenyl methacrylate (C10H10O2), and polyethylene tetraphthalate (C10H8O4). The gamma ray photons were detected by NaI(Tl) detector with resolution of 8.2 % at 662 keV, using radioactive gamma ray sources 57Co, 133Ba, 137Cs, 54Mn, 60Co, and 22Na at energies 122, 356, 511, 662, 840, 1170, 1275, and 1330 keV. Values of ?/? for the chosen polymers decrease with increasing energy. The results of investigated data are useful in plastic industry, building materials, agriculture fields radiation shielding, accelerator centers, polymer industry, medical field, etc.

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