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[en] The composition of back fill material for shallow land radioactive wastes disposal has been investigated by using bentonite, magnetic and quartz sands. The aim of this research is to observe the kind of mineral suitable for back fill material. The research was done for each mineral material and for the mixture of those three minerals. Firstly 2 grams of bentonite. magnetite or quartz sand was put into a glass column of 1.2 cm in diameter. Then the Sr-90 liquid waste was flown through out the column. In this experiment the adsorption velocity, through velocity, adsorption capacity and decontamination factor were determined for the grain size of 10 up to 100 mesh. By the same method the experiment was done for the mix of those three minerals. The experiment result indicated that the grain size mineral influenced the parameter of adsorption velocity, through velocity, adsorption capacity and decontamination factor. The relatively good result was obtained for the grain size of 80 mesh. Among the three kinds of minerals, bentonite had the highest of adsorption capacity and decontamination factor, while its adsorption velocity and through velocity were the lowest. The mixture of that three minerals gave better result than that mixture of two mineral component. The usage of the mineral mixture with the grain size of 80 mesh and the weight ratio between that component of 1:1:1, resulted in the decontamination factor of 68.44, the adsorption capacity of 235 ml/g, the adsorption velocity of 31x10-3 ml/sec. and the through velocity of 1.82x10-3 ml/sec
Source
Sudjatmoko; Karmanto, Eko Edy; Endang-Supartini (Yogyakarta Nuclear Research Centre, National Atomic Energy Agency, Yogyakarta (Indonesia)); National Atomic Energy Agency, Yogyakarta Nuclear Research Centre, Yogyakarta (Indonesia); 394 p; ISSN 0216-3128; 
; Apr 1996; p. 382-386; Scientific Meeting and Presentation on Basic Research in Nuclear Science and Technology; Pertemuan dan Presentasi Ilmiah Penelitian Dasar Ilmu Pengetahuan Teknologi Nuklir; Yogyakarta (Indonesia); 23-25 Apr 1996; Also available from Centre for Development of Nuclear Informatics, National Nuclear Energy Agency, Puspiptek Area, Fax. 62-21-7560923, PO BOX 4274, Jakarta (ID); 5 refs; 2 tabs.
; Apr 1996; p. 382-386; Scientific Meeting and Presentation on Basic Research in Nuclear Science and Technology; Pertemuan dan Presentasi Ilmiah Penelitian Dasar Ilmu Pengetahuan Teknologi Nuklir; Yogyakarta (Indonesia); 23-25 Apr 1996; Also available from Centre for Development of Nuclear Informatics, National Nuclear Energy Agency, Puspiptek Area, Fax. 62-21-7560923, PO BOX 4274, Jakarta (ID); 5 refs; 2 tabs.