Radiation: Data Huh ??? So … how do we make sense of this data table?

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Presentation transcript:

Radiation: Data Huh ??? So … how do we make sense of this data table?

Radiation: Sifting Demo 15 Imagine that we have a pile of golf balls, beans and BBS; and that there are a total of 15 particles.

Radiation: Sifting Demo 15 12 Now suppose that I sift the pile through a coarse screen, and I end up with a pile of just 12 beans and BBs.

Radiation: Sifting Demo 15 12 5 Then, I sift that pile through a fine screen to get just 5 BBs. How many of each particle did I have in the first place?

Radiation: Sifting Demo 15 12 5 GOLF BALLS: Started with 15 total (no screen), but 12 of those were beans & BBs that made it through the coarse screen. So, only 3 were golf balls. None Coarse Golf Balls

Radiation: Sifting Demo 15 12 5 Then, if 12 beans & BBs made it throught the coarse screen, but only 5 BBs made it through the fine screen, there had to be 7 beans. Coarse Fine Beans

Radiation: Sifting Demo 15 12 5 Last, 5 BBs made it through the fine screen. Fine BBs

Radiation: Sifting Demo 15 12 5 None - Coarse = 3 Golf Balls Fine 7 Beans 5 BBs Summary: No screen – coarse screen = golf balls, …

Radiation: Shielding None - Paper = 2 Alphas Copper 4 Betas 1 Gamma Similarly, different particles pass through the different shields: alphas are blocked by paper, but betas and gammas make it through. Only gammas get through copper. So, no shield counts – paper counts gives alphas, etc. None - Paper = 2 Alphas Copper 4 Betas 1 Gamma

Radiation: Shielding None - Paper = ? Alphas Copper Betas Gamma Example numbers: Calculate the results … None - Paper = ? Alphas Copper Betas Gamma

Radiation: Shielding None - Paper = 112 Alphas Copper 1951 Betas 57 Gammas

Radiation: Shielding None - Paper = ? Alphas Copper Betas Gammas You will use your actual counts … None - Paper = ? Alphas Copper Betas Gammas

Radiation: Shielding Calculate the percentage of counts as shown

Radiation: Shielding But, which isotope has this assortment of particles? ?

Radiation: Shielding Find best match in Isotope Table …