 Nyorai kupfuurira kweiyi ndima - Iodine-131 131I, I-131 inokosha radioisotope yeiodine yakawanikwa naGlenn Seaborg naJohn Livingood muna 1938 paYunivhesiti yeCalifornia, Berkeley. Iine hafu youpenyu hwokuputsika kwemwaranzi kwemazuva anenge masere. Inobatanidzwa nesimba renyukireya, nzira dzokurapa dzokuongorora uye dzokurapa, uye kugadzirwa kwegesi. Iyo inoitawo basa guru se radioactive isotope iripo mune zvigadzirwa zve nuclear fission, uye yaive mupiro wakakosha kune njodzi dzehutano kubva pakuyedza bhomba reatomu rakavhurika mumakore e1950, uye kubva kunjodzi yeChernobyl, pamwe nekuve chikamu chikuru che njodzi yekusvibiswa mumavhiki ekutanga muFukushima dambudziko renyukireya. Ikoku imhaka yokuti 131I chibereko chikuru chokuparadzaniswa kweuranium neplutonium, chinobatanidza inodokusvika 3 yezvibereko zvose zvekuparadzaniswa maererano nehuremu. Ona chibereko chemishonga yekuparadzanisa kuti uenzanise nemimwe mishonga yekuparadzanisa radioactive. I-131 inonziwo uranium-233, inogadzirwa ne thorium. 