numbers to try to solve this section of my lab thanks alot
- Hi I Could Use Some Help To Get Ahead Of My Lab You Can Use Fake Numbers To Try To Solve This Section Of My Lab Thanks A 1 (46.51 KiB) Viewed 37 times
- Hi I Could Use Some Help To Get Ahead Of My Lab You Can Use Fake Numbers To Try To Solve This Section Of My Lab Thanks A 2 (9.97 KiB) Viewed 37 times
The Half Life of 137mBa The metastable isotope 137m56 Ba will decay by emission of a y ray with an energy of 0.662 [MeV] (frequency of 1.60 x 1020 [Hz], wavelength of 1.88 x 10-12 [m]) with a half life of 2.552 minutes. You will measure this half life. Prepare a 137mBa source with the lab instructor. The liquid containing the barium will be on a small aluminum disk (a planchet). Do not touch the liquid or spill it. Since 137mBa has a relatively short half life, there is no risk of long-term contamination. Once the source is prepared, place the planchet in the slot nearest the Geiger counter. Click the start button to begin recording data. Please note that the count rate measurement may vary wildly. This is OK. Radioactive decay is a statistical process. The statistical nature will yield an accurate half-life over many trials while each individual measurement may be inaccurate due to fluctuations. The data recorded 4 in Data Studio is the number of counts versus time. Record data for ten minutes (600 seconds). When you are done collecting data, double-click on the graph icon in the lower left hand panel (the Displays window). Under Fit, select Natural Exponent. This will return a fit of the form Ae-C + B (5) to your data where B will tell you the background rate (compare to what you measured previously) and C tells you the disintegration constant in inverse seconds. Use equation (4) to compute the half life and compare to the anticipated value of 2.552 minutes.
- λτ/2 N. N 2 Ne - λτ/2 In—= Ine 2 - In 2 = -AT12 In 2 a T 1/2