[A new in vivo radiation method for determining the stable iodine content of the thyroid].

A new noninvasive method with a very low local radiation exposure (less than 2 mSv) is based on the principle of recording and assessment with an externally located gage of characteristic radiation of stable iodine of the thyroid with the energy of 28 KeV, excited by externally located sources of irradiation. The method was given the name of radiofluorescent assay (RFA) or x-fluorescent scanning of the thyroid. A series of units and methods of investigation were developed for RFA. The reproducibility, accuracy and radiation exposure of the above diagnostic method were assessed. A study was made of RPA values in healthy subjects (stable iodine concentration in the thyroid 500(+)-40 micrograms/g; stable iodine amount in the organ -10.3(+)-1.0 mg; Fe mass -20.2(+)-1.4 g) and their correlation with age, height, body mass and surface, 131I absorption, the blood concentration of TSH, T3, T4.