Introduction:
This unknown radioactive sample is quite old (approximately 30 years old), so its activity is low. You should compare the effect of shielding on this radiation using the data in the lab entitled "Shielding" - which gives shielding data for known isotopes.
Data
Background count: 20 cpm
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| none |
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| 2 sheets paper |
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| 1 piece plastic |
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| 1 piece Al metal |
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| 1 piece lead |
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Procedure
First correct for background radiation: subtract the background radiation from each value above. Next decide what type of radiation Unknown #204 is emitting.
Questions? Comments??
Robert Clark