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KARAKTERISASI NANOKOLOID TEKNESIUM(IV) OKSIDA HASIL IRADIASI BREMSSTRAHLUNG LARUT AN PERTEKNET AT

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Technetium(IV) oxide colloids were radiolytically formed by r irradiation of aqueous solutions of
pertechnetate (TC04-). Pertechnetate solutions (2.6x10-5-2.9x10-4 M) were irradiated with bremsstrahlung from an electron linear accelerator at 40 and 17°C. The color of irradiated solutions gradually changed to brownish black, suggesting the formation of Tc(IV) oxide colloids. The colloid was characterized in terms of the charge, size, crystalline structure, composition and hydration number. Point of zero charge (pHO)observed by electrophoresis (moving boundary method) showed that Tc(IV) oxide colloids has pHo between 3 and 1.5. A transmission electron microscopy (TEM) analysis showed that the size of colloids distributed around 30 to 130nm in diameter. Observation of the TcOz·nHzO colloid by a high resolution TEM and an electron diffraction analysis of the colloid particles showed that the colloids produced by bremsstrahlung irradiation were amorphous. Energy dispersive X-ray spectrometry (EDXS) analysis of one colloid particle suggested the colloid was found to consist of technetium and oxygen. The hydration number of colloid determined by specific radioactivity measurement of Tc-99 gave n = 3. The results from the present experiments revealed that the radiolytic product is nanocolloids of Tc(IV) oxide and can be used as initial information for Tc immobilization in the environment. Keywords: Tec1l1letium-99, Radiation induced nanocol/oid, Bremsstrahlung irradiation. Muhammad Zakir, Alfiall Noor Laboratorium Kimia Radiasi, Jurusan KIMIA, FMIPA Universitas Hasanuddin Makassar TSlltomo Sekille Laboratory of Environmental Radiochemistry, Graduate School of Science, Tohoku University, Sendai 980-8578Japan