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The Influence of Impurities on the Range of 28 MeV α‐Particles in NaCl Single Crystals
Author(s) -
Basu A. M.,
Choudhury A.,
Chaudhuri S.,
Mukhopadhyay P.,
Baliga B. B.
Publication year - 1985
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221280213
Subject(s) - impurity , materials science , irradiation , crystal (programming language) , range (aeronautics) , beam (structure) , absorption (acoustics) , doping , analytical chemistry (journal) , optics , atomic physics , chemistry , optoelectronics , nuclear physics , physics , organic chemistry , chromatography , computer science , composite material , programming language
Pure and impurity‐doped NaCl crystals are irradiated with 28 MeV α‐particles at room temperature. The beam current is 2 nA and the irradiation is continued for one minute in each case. Due to irradiation, F‐centers are produced uniformly in the crystals. The beam divergence is estimated from the observed area of the colored circular spot on the crystal. The optical absorption band of the colored samples are recorded. The efficiency of coloration (F‐center) is determined and is found to be independent of orientation and concentration of impurities in the crystal. The range of α‐particles is measured, which is found to be shorter in impurity‐doped crystals than in pure crystals. The results are explained in terms of recent observations.