Radiation sterilisation - a contract steriliser's view

Radiation processing is based on two characteristics of high energy radiations namely their ability to kill micro-organisms and their ability to modify polymer structure. Contract radiation plants are particularly prominent in the application of radiation processing, accounting for approx. 33% of gamma plants world wide and over 50% of installed Cobalt 60. Amongst contract radiation plants Globally sterilisation will account for some 70-80% of gamma plant revenues with 20-30% being associated with other microbiological control activities. Individual plants however will show significant variation. Total volumes of sterile product generated by contract gamma plants are estimated at approx. 1.5-2.0 m3 per annum. Chemical modification generally forms a small proportion of their activity in value or volume terms although the high dosages generally required for polymer modification may result in a larger proportion of process time. Non-sterilisation irradiation services based on microbiological control are provided for a variety of industries particularly pharmaceutical raw material, food packaging and pharmaceutical packaging and food itself. (author)