Abstract
To evaluate the calibration of the apparatuses that were used for measuring 131 I thyroid burden after the Chernobyl accident, four anthropometric thyroid phantoms of different sizes were prepared. The apparatuses calibrated with these phantoms included SRP68 types, DP-5 types and NK350B types. The results of these calibrations were compared with the previously determined official reference values. The official counting efficiency was found to be larger than the counting efficiencies for the anthropometric phantoms. This indicates that in the measurements conducted with these apparatuses there was a systematic underestimation of thyroid burden due to calibration. The extent of underestimation was 46% at its maximum for the three SRP68 types tested. The SRP68 type was the most commonly used apparatus after the accident. The other types of apparatuses not evaluated in the present study that were used after the accident should also be calibrated against anthropometric phantoms.
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