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Recovery of krypton from implosion of glass microballoons has been studied in the development of a radiochemical diagnostic for determination of 〈ρr)[sub fuel]. Collection onto metal surfaces following implosions performed on the OMEGA laser with 1-3 TW (1-2 kJ) of 0.35-µm light is consistent with an ion implantation mechanism. The dependence of the intrinsic collection efficiency on the energy fluence to the collector surface and its variation in implosions carried out under the same nominal conditions indicate ion energies extending to at least 0.1 MeV and energy distribution functions that are sensitive to the details of the implosion dynamics. Intrinsic sticking efficiencies approaching 0.5 can be obtained in the limit of low total energy fluence to the collector surface (≤0.1 J cm[sup -2]). [ABSTRACT FROM AUTHOR]