الفهرس 
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Abstract
Spent liquid scintillator cocktails which originated from liquid
scintillation counting technique are containing radioactive nuclides and
classified as one of the most problematic wastes. This can be attributed to
possessing both of specific radioactive contaminants and their organic
nature. However, special options should be developed to address these
characteristics of these wastes. Solidificationlstabilization (S/S) of these
wastes in cement is oriented to prevent the return of the harmful radioactive
materials to the environment during the disposal of these wastes keeping the
surrounding environment clean and tidy for man and has coming
generations.
The present study aims to immobilization of the spent organic liquid
scintillator wastes (LSW) collected and segregated at the Nuclear Research
Center, Egyptian Atomic Energy in cement matrices which contain natural
clay as admixture. This work is a part of comprehensive program stated and
carried out at the Radioisotopes Department since 1970.
The performance of the candidate final waste form (FWF) that
composed from cement matrix mixed at w/c ratio 0.3 with 3% natural clay,
relative to the weight of cement powder as admixture, and immobilized up
to 15% from LSW, relative to the weight of the cement paste, was evaluated
after curing under different conditions.
Based on the experiments data, it could be concluding that, there are
prime encouraging indications that the candidate FWF can be an adequate
monolith for solidificationlstabilization up to 15% of actual spent LSW,
relative to the weight of the cement paste, and comply with the
requirements of the disposal process even in at very exaggerating
conditions.