θˈæliəm aɪ ˈaɪədˌaɪd ɪz ˈɔːlsoʊ jˈuːzd ɪn tɹˈeɪs ɐmˈaʊnts wɪð nˈɑː aɪ ɔːɹ sˌiːˈɛs aɪ tə pɹədˈuːs sˈɪntɪlˌeɪɾɚz jˈuːzd ɪn ɹˌeɪdɪˈeɪʃən dɪtˈɛktɚz.
Thallium(I) iodide is also used in trace amounts with NaI or CsI to produce scintillators used in radiation detectors.