Calculate the concentration at the specified time for the fo…

Calculate the concentration at the specified time for the following information:  I-131: t1/2 = 8.04 days, activity is calibrated to be 100 mCi in 2.8 mL on 10/11 at 0800. Calculate the expected activity at 0800 on 10/9. Give your answer in both mCi/mL and in MBq/mL.  

Compare and contrast the decay processes of electron capture…

Compare and contrast the decay processes of electron capture and positron decay by answering the following questions: State two similarities and two differences. Include the changes in characteristics of the element including protons, neutrons, and electrons, type of transition and emissions. You may include a drawing on your math work pages to aid in demonstrating your answer. 

The following questions refer to the 662-keV gamma ray produ…

The following questions refer to the 662-keV gamma ray produced by Cs-137’s decay to Ba-137. Express your answer in either scientific notation or using a prefix, and don’t forget to consider sig figs. What is the frequency of this gamma ray? What is the mass equivalent of this gamma ray?