MCNP SIMULATIONS WITH A PERSONALISED VOXEL PHANTOM TO VERIFY 131I CONTENT IN THYROID ESTIMATED BASED ON MEASUREMENTS WITH AN NaI(Tl) SPECTROMETER

Radiation Protection Dosimetry
Kotaro TaniOsamu Kurihara

Abstract

One of the authors (O.K.) stayed in the area located ~110 km south from the Fukushima Daiichi Nuclear Power Plant during the arrival of radioactive plumes released into the environment due to the accident in March 2011 in Japan. A previous study determined his 131I thyroid content using an NaI(Tl) spectrometer. The one remaining issue was to investigate the measurement error due to inevitable differences in the configuration (e.g. the thyroid shape and volume) between the physical phantom employed for calibration of the spectrometer and the real subject. In the present study, Monte Carlo simulations for the thyroid measurements were performed using the Monte Carlo N-Particle (MNCP) code to investigate discrepancies in peak efficiencies of the spectrometer between the personalised voxel phantom created from O.K.'s magnetic resonance images and the several typical/reference phantoms that exist. As a result, the peak efficiencies for the Oak Ridge Institute of Nuclear Studies (ORINS) phantom were found to be comparable to those for the reference voxel phantoms reproducing realistic human anatomy (the Adult Male phantom and the Japanese Male phantom). The peak efficiency for the personalised phantom, on the other hand, was fairly c...Continue Reading

References

Oct 18, 2011·Radiation Protection Dosimetry·Kaoru Sato, Fumiaki Takahashi
Jul 14, 2012·Scientific Reports·Shinji TokonamiMikhail Balonov
Dec 26, 2015·Radiation Protection Dosimetry·M Moraleda, J M Gómez-Ros
May 6, 2017·Journal of Radiological Protection : Official Journal of the Society for Radiological Protection·Wi-Ho HaYoung Woo Jin

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