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Workshop for radioactivity and experimental observations

Workshop for radioactivity and experimental observations. Radioactivity units. weighting factors. Safety. CT scan. Example 1  -ray  100 ergs in 1 gram of issue gives 1 R. 1 rad of absorbed dose  100 ergs of radiation energy absorbed by 1 g ram. 1 rad  1 R. Example 2

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Workshop for radioactivity and experimental observations

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  1. Workshop for radioactivity and experimental observations

  2. Radioactivity units

  3. weighting factors

  4. Safety

  5. CT scan

  6. Example 1 -ray  100 ergs in 1 gram of issue gives 1 R. 1 rad of absorbed dose  100 ergs of radiation energy absorbed by 1 gram. 1 rad  1 R. Example 2 A survey meter gives reading in Roentgen (R). For 1 R of -ray  1 rad Since WR = 1 , equivalent dose= 1 rem 1 rem = 0.01 Sv Hence 1 R  0.01 Sv = 10 mSv

  7. Example 3 • Background radiation = 0.02 mRhr-1. • 0.010.02 mSvhr-1 • = 0.2 Svhr-1 • = 1.75 mSv per year •  the average background of 2.65 - 2.75 mSv per year

  8. Example 4 A lantern mantle shows radiation of 2.5 mRhr-1 The radiation dose = 0.01 2.5 mRhr-1 = 0.025 mSvhr-1 Maximum dose is 1 mSv, maximum time to contact it = 1 mSv / 0.025 mSvhr-1 = 40 hrs (for a pubic member); or 20 mSv / 0.025 mSvhr-1 = 800 hrs (for a related worker), Note: Mantle containsthorium dioxide powder ---- radioative. Never touch it with bare hands. Wash hands after using it.

  9. Safety of Food – effective dose coefficient (Bq to Sv Example 5 菠菜含有10000 Bq/kg碘131 成人每天吃菠菜⒛克 一年的有效剂量 = 10000 Bq/kg  0.02 kg x 365 days x 0.000016 = 1.2 mSv / year

  10. CoWIN webpage

  11. Experiment 1 Inverse square law of radiation Net count rate  1/d2

  12. Experiment 2 Absorption of -radiation in aluminum I(x) = Io e - x ln (Io /I) =  x Slope = 11.69 /cm

  13. Cloud chamber and artificial precipitation & Emulation of radioactivity experiment

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