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Year : 2012  |  Volume : 35  |  Issue : 2  |  Page : 80-83

Estimation of intake by maximum likelihood method using follow up measurements of 131 I thyroidal burden

Internal Dosimetry Section, Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India

Correspondence Address:
Vandana P Ghare
Internal Dosimetry Section, Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai - 400 085, Maharashtra
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-0464.112347

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Context: 131 I is widely used for diagnostic and therapeutic purposes. Since thyroid is the main deposition site for 131 I, so it can be detected by direct thyroid monitoring. Aim: This work presents results of follow-up measurements of an individual who was internally contaminated with 131 I with injected activity being determined by maximum likelihood method. Importance of dose per unit content is also shown in this study. Materials and Methods: The whole body monitoring system available in Radiation Safety Systems Division of Bhabha Atomic Research Centre is calibrated for estimation of 131 I in the thyroid of radiation worker using BOttle MAnnikin Absorber (BOMAB) phantom with neck part being replaced by American National Standards Institute (ANSI)/International Atomic Energy Agency (IAEA) neck. Results: The estimated intake was found to be 89.24 kBq and the committed effective dose is calculated as 1.96 mSv. The data are analyzed with autocorrelation and Chi-square test to establish goodness of fit with log-normal distribution. Conclusion: The overestimation of thyroid activity by use of mid axial hole in BOMAB phantom is removed by using ANSI/IAEA neck phantom. Measured retained thyroidal data on different days following the intake has closely fitted to the ICRP predicted retained activity.

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