Sentence:  The protein bound iodine was 6.6 | mg. % , and the radioactive <WSD>iodine</WSD> uptake over the thyroid gland was 46 % in 24 hours , with a conversion ratio of 12 % . 
Meaning of the word marked with <WSD> tags:  a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks)