High schools in Illinois are doing it; you should, too.
I never thought it was a good idea to have radioactive samples of any kind in a high school lab. There's just no need for it. However, the high school physics teaching community is populated with many individuals who came from nuclear industry or research. Nuclear physics holds a special place in their hearts. So my aversion to radioactive samples seems like a minority view.
I'll lay out a few reasons for my "no nukes" view. Please feel free to add a "pro nukes" viewpoint in the comments. (Or "no nukes" arguments I forgot.)
1. We teach too many topics in high school physics already; nuclear physics can wait.
2. Listening to ticks from a Geiger counter doesn't have a lot of thrill-value.
3. Career-long exposure to the radiation coming from that "hot plate" (the lead-based glaze on that Fiesta ware you got in TJ that one time) cannot be healthy.
4. The California academic content standards in physics certainly do not call for nuclear anything.
5. Whatever coverage is called for by the College Board in terms of the AP Physics B Exam can be covered paper and pencil-style.
So poke around your storage area and round up your sources for hazmat disposal.