Production of positron annihilation radiation by cosmic-rays near sea level
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Production of positron annihilation radiation by cosmic-rays in Al, Fe, Sn and Pb is measured by means of a triggered HPGe detector. The equipment is located in Belgrade, at an absolute height of 125 m a.s.l. The production rate per unit mass is found to be proportional to the square of the atomic number of the material divided by its mass number, with the proportionality constant equal to 8.1(3) x 10(-6) s(-1) g(-1). (C) 2002 Elsevier Science B.V. All rights reserved.