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Don't do it. KI is a thyroid blocker. It only blocks uptake of radioiodine, the most common radioisotopic form being 131I, which has a half-life of eight days. That means only releases from an operating reactor core or very freshly-removed fuel from a reactor core would have a significant source term for 131I. This is almost impossibly unlikely as a significant component of a RRD (”Dirty Bomb”). The most likely source term for a RRD would derive from perhaps a barrel of mixed waste that you might get from a hospital or low-level waste disposal operation. While radioiodine is used in some tyroid uptake studies and scans, the quantities are very small, especially those that end up in the waste stream. More likely are things like 32P and tritium, and KI won't help or that.