Abstract
The monitoring of the intake os radionuclides by workers and public individuals, using in vivo measurements, requires the application of calibration factors obtained with physical-anthropomorphic phantoms. In the case of 131I, the lack of anatomical realism of the phantom might impair the quality and reliability of the monitoring result. Thus, in order to develop a thyroid phantom by means of 3D printing, images of the voxelized models provided in ICRP 110 were used. The superposition of the images of the original model and the treated model demonstrate the maintenance of morphological characteristics. Therefore, image manipulation techniques applied in this work aimed to smooth the sharp angles of the original image and the prototype printing were considered effective.
Highlights
Individual monitoring is one of the radiological protection tools to assess effective dose or equivalent doses received by an occupationally exposed individual (OEI) from any type of external or internal exposure
The biokinetic model for 131I is described in ICRP 67 [5], where it is admitted that upon transfer to the blood, about 30% of 131I activity is retained in the thyroid gland, while about 70% is excreted directly in urine
The present study aimed to develop a specific thyroid model, based on the images of the RCP_AF reference voxelized model provided by ICRP 110 [20]
Summary
Individual monitoring is one of the radiological protection tools to assess effective dose or equivalent doses received by an occupationally exposed individual (OEI) from any type of external or internal exposure. All workers with a potential risk of exposure to annual doses exceeding the registry level of 1 mSv per year must undergo an individual monitoring program that must be included in the radiological protection program of the facility [1]. In nuclear medicine the routine handling of 131I unsealed sources results in a significant risk of intake through inhalation and ingestion and, internal exposure. This risk is associated to the fact that iodine is a volatile element at room temperature. It is known that a large part of the radionuclide (80%) returns to the blood circulation and will be absorbed by the thyroid gland and excreted in urine; the rest (20%) is excreted in feces [6]
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