Ice Nucleation on Radioactive and Nonradioactive Silver Iodide Particles

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  • a National Center for A Atmospheric Research, Boulder, Colo. 80302
  • | b Battle Pacific Northwest Laboratories, Richland, Wash. 99352
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Abstract

The ability to nucleate ice was compared for nonradioactive and radioactive silver iodides, and for silver iodide exposed to γ-radiation. Isotopes used were AgI, 110AgI, Ag131I and 110Ag131I. Experiments indicated that silver iodide particles containing 131I were more efficient ice-forming nuclei than nonradioactive ones. This can be explained by nucleation on Ag+ ions present in the AgI crystal lattice after transformation of 131I to 131Xe. Radioactivity associated with decaying atoms in the AgI lattice did not retard nucleation of ice by either contact, condensation followed by freezing, or freezing.

Abstract

The ability to nucleate ice was compared for nonradioactive and radioactive silver iodides, and for silver iodide exposed to γ-radiation. Isotopes used were AgI, 110AgI, Ag131I and 110Ag131I. Experiments indicated that silver iodide particles containing 131I were more efficient ice-forming nuclei than nonradioactive ones. This can be explained by nucleation on Ag+ ions present in the AgI crystal lattice after transformation of 131I to 131Xe. Radioactivity associated with decaying atoms in the AgI lattice did not retard nucleation of ice by either contact, condensation followed by freezing, or freezing.

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