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Industrial gamma irradiators are designed for processing large
amounts of products, which are exposed to large gamma radiation
doses. The irradiation, in industrial scale, is usually carried out
in a dynamic form, where products go around a Co-60 gamma source
with activity of about PBq (MCi). In some situations (research
purposes or validation process according to norm ISO 11137), it is
required to irradiate small samples within fractional deliver
doses. Samples are placed inside the irradiation room at a fixed
distance from the source and the dose is usually determined by
using dosimeters, therefore the dose is only known after completed
the irradiation. Usually different kinds of products with different
densities go through between the source and static position
samples. So, the dose rate varies in function of product density. A
suitable methodology would be to monitor samples dose in real time,
which would improve dose accuracy, avoiding the overdose. A
cylindrical 0.9 cm3 ionization chamber has been developed for
high-doses real-time monitoring, when the sample is being
irradiated at a static position in a Co-60 gamma industrial plant.
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