The track lengths of heavy ions in mica

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Abstract

The etching conditions have been studied under which visible tracks are developed in mica previously irradiated with heavy ions. The registration threshold was found to lie between ion charge Z = 10 and Z = 13. Track lengths have been measured for aluminium, nickel, argon, krypton and gold ions in the energy range 0 – 1.0 MeV/nucleon. The data have been compared with range predictions of Lindhard et al., and are consistent with a track being etched for that part of the ionic trajectory in each case within which the stopping power exceeded a critical value of 10.1 MeV/mg/cm−2. The probability for registration of all ions studied heavier than neon, incident on the mica at 30° to the surface, was found to be indistinguishable from unity.

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Work performed under National Research Council, Grant No. A2510.

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