| dc.description | Introduction: Brachytherapy is a form of treatment that uses radioactive seeds placed in
contact or inside the region to be treated, maximizing the radiation dose inside the targeted areas.
Iridium-192 is being used in brachytherapy since 1955. It presents emission energy in the ???therapy region???
(370keV) and is easily produced in a nuclear reactor (191Ir (n, ??) ??? 192Ir). Wires are an iridium-platinum
alloy with 0.36 mm diameter and they can be cut in any needed length. They can be used in several types
of cancer. The linear activity is between 1 mCi/cm (37 MBq/cm) and 4 mCi/cm (148 MBq/cm) with
variations of 10% in 50 cm maximum. This activity values classified the treatment and low dose rate (0,4
?? 2 Gy/h). The propose of this work is to present a waste management system in a cancer treatment
radioactive sources production laboratory. Methodology and Results: The solid waste is previously
characterized in the analysis phase. The contaminants are already known and they are insignificant due
to their fast half- life. The iridium-192 half-life is 74.2 days, classified as very short half-life waste. The
waste activity is adds to 8mCi (2.96x108 Bq) per wire. According to the CNEN-NN 6.08 standard, that
presents the discharge levels, the limit is 1 kBq.kg-1 (2.7x10-5 mCi.kg-1). The radioactive waste generated
during the I192 wires production has a weakly activity of 9.7 GBq.g-1. According to the standards, this
activity is too high to be discarded into the environment. The waste must be managed following
the ALARA principal using the R&R (retain e retard) system, that means, temporary storage and posterior
discharge. Since every 4 months, maintenance is performed inside the hot cell used for production, the
waste must be removed. Using the equation: ???? =
????
??
(1 ??? ?????????t), the total calculated activity is 1.68 x 1016
Bq and 4.8 g mass at the end of each 4 months period. This amount is stored inside a shielding device
that has 212.37 cm3 volume. The waste will take 9.8 years (calculated by ???? = ????0(?????????t)) to decay to the
discharge levels. To store 30 devices during 10 years, a space with 6,370 cm3 is necessary. The
laboratory has enough space for this storage. Thus, the radioactive waste management can be performed
through the R&R (retain and retard) system safely. | |
