The best replacement for sodium iodide is potassium iodide.

The best alternatives to sodium iodide are rated as following:
★★★★★  potassium iodide
★  sodium chloride

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Speaking about sodium iodide, one probably shouldn't forget about chlorine.

Other search terms related to sodium iodide and their ratings are:
★★★★★ chlorine
★★★★★ bromine
★★★ silver nitrate
★★ 1-bromobutane
★★ lead nitrate
★ sodium hypochlorite
2-chlorobutane
You have in mind a companion for sodium iodide and it is not yet here? Propose!



Google Trends

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sodium iodide
potassium iodide
sodium chloride