Question

Pre-lab Questions Radioactivity 1. Classify the following decays as a, 8, y or positron emission: 3Th+e AL hal ox) (a) 2U3Np+ 235 ma (b) Gamma (c) Ra He+Ra 88 88 Alfha lac) (d) 2. Iodine-131 is used to treat certain types of thyroid cancer and some rarer types of cancer. Given that its half-life is 8days, calculate the amount of iodine of a 4g sample remains after 10 days. 3. Strontium-89 is used to treat some types of secondary bone cancer. Given that its half-life is 50days, calculate the time needed to reduce a 4g sample into 2g. 4. Iron-59 is used in studies of iron metabolism in the spleen. A Iron-59 sample has an activity of 20epm and 10cpm 46 days after the first measurement. Calculate the half life of the isotope.