Experiment 11 Radioactivity DATA Complete the questions below. 1. Part A: Background reading_ 9 com Part B 2. Complete the data table below. Data Table I Intensity vs. distance from Part B where units are counts per minute (cpm). Gamma Beta Alpha Isotope Co - LO SK- 90 Po - 210 2 cm 54 epm 204 epm 6 com 4 cm 24 CPM 108 Com 6 cm 45 com 4 com 3 cm 19.com 33 cpm 3 com 10 cm A Com 24 com I com 3. On the below graph, roughly draw intensity vs. distance for the beta decay data to help with your explanation about distance and radiation. Label the axes correctly. Connect the data points. Note: 2 cm = 8 lines. Of 2cm 4cm wem 8 0m 10 em Page 7Part C 4. Complete the data table below. has been reached. Data Table 2 Shielding measurements where units are cpm. Continue with shielding until the fourth layer OR the background limit of 50 com Material at 2cm Gamma Paper-Index Card Beta 18 13 and 1 st Alpha and com 254 (pm| 243 com 1 st and 3rd 8 Upm 4 th 3ra 4th 3rd 4 th Cardboard 1 st 245 com 205 cpm 2nd 604 com 51cpm 2nd 3rd 245 com 189 cpm 1 st 2nd 4th ard 8 cpm 4 th 3 rd 59 com 43com 4 th Aluminum 1 st 137 epm 2nd 93 cpm 53epm and 54 cpm 185 cpm and 3rd 177 com 4 cpm 52 cpm 3rd 52 cpm 4 th 3rd 171 epm 4 th Plastic 1 st 2nd 174 epm Lol epm and 54 epm and 3rd 103 cpm 15 cpm 4th 8 cpm 3rd Ath 3rd 53 Com 4th Glass 605com 47 cpm 1 st iepm 3rd 4th 3rd 4 th 4 th Lead 1 st and 55 epm 1 st 46com 8 com 3 TC 4th 3rd com 4 th 3rd 4 th LAB REPORT linearly? " 5. Part B: What is the effect of increasing distance on the amount of radiation detected and does it change Part C . Which radioactive disc has the lowest penetrating power? Hint: Look at what it can go through and what it cannot. Do not just look at the total number of counts. Alpha 7. Which radioactive disc has the highest penetrating power? You should see where the count drops suddenly when you place a barrier between the sample and the Geiger counter. Gamma 8. What type of shielding was the most effective for each type of radiation? Lead , glass10. Determine the half-life of the radioactive sample: Take a point from the fitted curve and another that is haif the value of it. Determine the time for each of the points. Do this with two different starting points. The difference in the time for the two points is the half-life. 3.5 min - 0.5 min = 3 min half life 10.5 min - 4. omin = 4.5 min POST LAB 11. Explain why scientists take points from a fitted curve instead of using specific data points (the numbers collected by the computer) to determine the half-lives. 12. Determine the percentage of Pd-100 remaining after 18 days if Pd-100 has a half-life of 3.6 days. Show each decay step. 13. Determine the half-life of a sample if, after 24.0 days, it was originally at 128.0 mg and decayed to 2.00 mg. Show each decay step. Complete the following radioactive decay equations. 14 214Fr - ZHe + 21. TEBr - 34Se + 15. SHe - B+ 22. 52 Fe - B+ 16. 35Br - B+ + 23 185 Au -> at 17. 172Pt - a + 24. 60Ni - y + 18 . 232Np - 233 Pa + 25. 59Co - B+ 19. INa - 12Mg + 26. 13 N - B+ + 20. 50Mn - 39Cr + 27. 1465m - 142Nd +