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Article
Author(s)
João A. Moura1*, Anselmo Feher1, Carlos A. Zeituni1, Maria E. C. M. Rostelato1, Wilson A. P. Calvo1, Oswaldo L. Costa1, Carla D. Souza1, Dib K. Júnior2 and Anderson R. Camargo3
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DOI:10.17265/2159-5348/2015.05.004
Affiliation(s)
1. Instituto de Pesquisas Energéticas e Nucleares (IPEN/CNEN - SP) Av. Professor Lineu Prestes 2242 05508-000 São Paulo, SP, Brazil
2. Universidade de São Paulo (USP Leste) Rua Arlindo Bettio, 1000 03828-000 São Paulo, SP, Brazil
3. Faculdade de Tecnologia de Sorocaba Departamento de Mecânica Av. Engenheiro Carlos Reinaldo Mendes, 2015 18013-280 Sorocaba – SP, Brazil
ABSTRACT
In the prostate cancer treatment, brachytherapy with iodine-125 seeds has been used. Iodine-125 seeds are sealed radioactive sources, made by a titanium capsule containing the radioisotope inside. In the final phase of the seeds production, it is necessary to ensure that there is no leakage of the radioactive material. A leakage test is performed, immersing the seeds in water during 24 h and measuring the resulting activity in the water. This measurement is made in a sodium iodide detector. The immersion water is transferred to a plastic tube with a cap. The tube is placed by an automated positioning system, in the detector chamber. This study aims to determine the best positioning of the tube for the detection. It is also important to determine the influence of the positioning variation intrinsic of the automated positioning system during the iodine-125 seeds production. The results obtained will be used as a reference to adjust the equipment and process control system, in the production of the iodine-125 seeds.
KEYWORDS
Iodine-125 seeds, brachytherapy, prostate cancer treatment, leakage immersion test, automated positioning system.
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