TY JOUR TI X-RAY FLUORESCENCE ANALYSIS IN THE DIAGNOSIS OF THYROID CANCER KW thyroid goiter KW thyroid cancer KW chemical elements of thyroid tissue KW X-ray fluorescence analysis JO Medical Radiology and radiation safety AU Zaychik, V.E. AU Davydov, G.A. PY 2017 IS 62 PB Federal Medical Biological Agency of Russia