 Problem #1  In the previous dose calculation, we used a pre‐defined file with the emission rates and dose conversion factors for the topten radionuclides. Which one of these radionuclides is the most important for air dose and deposition dose?
 Hint 
Simply multiply the emission rate and dose conversion factors to determine the contribution of each radionuclide.
 Solution  Importing the activity.txt file into EXCEL to compute the products, shows that ^{133}Xe was the largest contributor to the air dose, but ^{133}I was the largest contributor to the deposition dose. Would the topten list be the same after one week or one year?
 Problem #2  In the previous dose calculation, we used a 5 km resolution concentration grid. Would the dose still be underestimated if we used a finer concentration grid?
 Hint 
Edit and run the cust_dose batch file to use a 1 km by 250 m grid resolution.
 Solution 
5 km air dose versus
1 km air dose
and
5 km deposition dose versus
1 km deposition dose.
6 m 1 s
 Problem #3 
There is some uncertainty regarding particle sizes for this event and a fraction of the radionuclides may have been emitted on much larger particles. Using the same configuration as in problem #1, recompute the doses using a deposition velocity of 1 cm/s rather than 0.1 cm/s.
 Hint  Edit the script cust_dose and rerun the calculation.
 Solution  Although the air dose is unchanged, the maximum deposition dose has more than almost doubled.
5 m 54 s
