Radiation dosimetry for thyroid cancer patients and validation using 3D printing phantoms
by M.M. Emad El-din; Eman Massoud; Ahmed Yousry El-Agamawi; A.M. Kany; M.R. Ezz El-din
International Journal of Nuclear Energy Science and Technology (IJNEST), Vol. 14, No. 4, 2020

Abstract: This research presents the external radiation exposure resulting from Well Differentiated Thyroid Cancer (WDTC) patients after receiving radioiodine (I-131) activities orally and its decay as a function of time. Dose rates were recorded at different time post-administration using a survey meter for 86 thyroidectomised WDTC patients during follow-up diagnosis procedures and during radiotherapy hospitalisation period. Afterwards, a 3D phantom was designed based on Computed Tomography (CT) images to validate the external exposure. Retained activities were found to be 32.1, 13.7, 6.3 and 3.1% within 24, 48, 72 and 96 h respectively. The measurements acquired from the 3D phantom were 14.3:18.1% higher than real patients. Dose rates were less than 10 µSv/h at 3 m distance that is considered safe distance from patients during diagnosis procedures. The administrated activity decays via bi-exponential relation with time, and it is recommended to quarantine patients undergoing post-operative radiotherapy for 36 hours post-administration at least.

Online publication date: Tue, 21-Sep-2021

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