Gamma Radiography Testing of Collimators for Boron Neutron Capture Therapy
AJSTD 36(1) cover


BNCT Gamma Radiography BNCT Collimator Cracks Porosity


BNCT (Boron Neutron Cancer Therapy) is a cancer treatment method that uses boron delivered to the tumour cells followed by neutron radiation. But for BNCT method, only epithermal neutron are needed to radiated tumour cells. Using collimators, fast neutron are moderated into epithermal neutrons. When radiation is performed, neutron beams are emitted and filtered by a collimator. In this study, 12 collimators used in the BNCT process is inspected for its quality. Any defect or flaws are the main object in this study. The collimators are manufactured by centrifugal casting. Its has the following dimensions; height 145 mm; outer diameter 190 mm; inner diameter 160 mm and thickness 15 mm. The collimators material was made of 99% pure nickel. The inspection method used is gamma radiography testing. Gamma radiography testing using an Iridium-192 gamma source was conducted. Using Single Wall Single Image Technique (SWSI) the collimators are exposed for 30 seconds. Six FUJI films was placed behind the object to record the imaging resulting from gamma ray radiography. The resulting images from this experiment showed any lighter and darker areas. Porosity or flaws appeared as darker areas in the film. The obtained result of this experiment showed any cracks on collimator number 1 and 5, porosity was identified in almost all of collimators. Later, the collimators with crack inside must be recycled, while the collimators with porosities still need to be investigated further for its quality for BNCT application.
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