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[Phys-L] geiger counter



I teach in high school and am wanting an "inexpensive" portable geiger counter
for some activities in our Science Club. To detect alpha, beta, and gamma
radiation (and x-rays?). I want the device to have a peaker so kids can
easily hear the ticks. Many are available online. Anyone have experience
with these or use one in their teaching? Any good activities, ideas, or
write-ups?

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