Where could I borrow or rent inexpensively a geiger counter for my science fair project?

If you’re near a university or college, they might have one. Look up labs and so forth and tell them about your project. Ask your teacher…you might even visit Radio Shack. Get creative…

You might not think $150 is cheap, but SparkFun has one that interfaces with a computer via USB. Also, I don’t think it “ticks” like the old ones do, but with some programming knowledge, it can trigger an event on your computer.

For the cost-conscience, you can buy one that is called a microwave leakage detector. Would probably be just enough for your experiment. Good luck.

By the way, some years back, I searched through a big box store for a microwave for a friend using one. The only one that didn’t leak was a Sunbeam combination micro and little oven. I don’t think they make them anymore.

When I was a volunteer firefighter, the department had several Geiger counters.We have an atomic power “close”. Your local department might let you borrow one. A paid fire department might even let you use one. Also, is there a nuclear power plant near you. They might be able to suggest where to rent or borrow one.

In every city or town there are tool rental shops. Also check with the Agricultural Extention Office in your town or county. They are a there for your information.