Equipment List: 3 total setups

1. Geiger tube mounted in cylindrical holder with shelves below them (careful, Geiger tube is easily damaged)
2. Source set with four sealed radioactive sources:
   • 137Cs
   • 90Sr
   • 204Tl
3. Set of absorbers in wood box:
   • plastic
   • polyethylene
   • aluminum
   • lead
4. Geiger tube control and counting unit (SPECTECH ST360 Counter)
5. Stopwatch

General Lab use:

1. Mini generator
2. 137mBa

Notes and tests:

1. Test