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Word Count: 1,763
Radioactive wastes must for the protection of mankind be stored or disposed in such a manner that isolation from the biosphere is assured until they have decayed to innocuous levels If this is not done the world could face severe physical problems to living species living on this Some atoms can disintegrate spontaneously As they do they emit ionizing radiation Atoms having this property are called radioactive By far the greatest number of uses for radioactivity in Canada relate not to the fission but to the decay of radioactive materials - radioisotopes These are unstable atoms that emit energy for a period of time that varies with the isotope During this active period while the atoms are decaying to a stable state their energies can be used according to the kind of energy they Since the mid 1900s radioactive wastes have been stored in different manners but since several years new ways of disposing and storing these wastes have been developed so they may no longer be harmful A very advantageous way of storing radioactive wastes is by a Vitrification is a semi-continuous process that enables the following operations to be carried out with the same equipment evaporation of the waste solution mixed with the additives necesary for the production of borosilicate glass calcination and elaboration of the glass These operations are carried out in a metallic pot that is heated in an induction urnace The vitrification of one load of wastes comprises of the following stages The first step is Feeding In this step the vitrification receives a constant flow of mixture of wastes and of additives until it is 80 full of calcine The feeding rate and heating power are adjusted so that an aqueous phase of several litres is permanently maintained at the surface of the pot The second step is the Calcination and glass evaporation In this step when the pot is practically full of calcine the temperature is progressively increased
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