| dc.description | The aim of this work is to develop an automation system for Quality Control (QC) in the
production of iodine-125 sealed sources, after undergoing the process of Laser Beam Welding
(LBW). These sources, also known as iodine-125 seeds are used, successfully, in the
treatment of cancer by brachytherapy, with low-dose rates. Each small seed is composed of
a welded titanium capsule with 0.8 mm diameter and 4.5 mm in length, containing iodine-125
adsorbed on an internal silver wire. The seeds are implanted in the human prostate to irradiate
the tumor and treat the cancerous cells. The technology to automate the quality control system
in the manufacturing of iodine-125 seeds consists in developing and associate mechanical
parts, electronic components and pneumatic circuits to control machines and processes. The
automation technology for iodine-125 seed production developed in this work employs
Programmable Logic Controller (PLC), step motors, drivers of control, electrical-electronic
interfaces, photoelectric sensors, interfaces of communication and software development.
Industrial automation plays an important role in the production of Iodine-125 seeds, with
higher productivity and high standard of quality, facilitating the implementation and operation
of processes with Good Manufacturing Practices (GMP). Nowadays, the Radiation
Technology Center at IPEN-CNEN/SP imports 36,000 iodine-125 seeds per year and
distributes them for clinics and hospitals in the country. However, the Brazilian potential
market is of 8,000 iodine-125 seeds per month. Therefore, the local production of these
radioactive seeds has become a priority for the Institute, aiming to reduce the price and
increase the supply to the population in Brazil. | |
