Abstract
We investigate the electric potential of high speed interstellar grains trapping radioactive nuclei which are suggested to exist in interstellar medium by the study of meteorite samples and the gamma-ray line observation. These radioactive nuclei, e.g.22Na,26Al,44Ti and60Fe bring about a drastic change in grain potential. Grains with larger radius than the critical radiusac attain a negative potential when grains are traversing a typical intercloud region.
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