NSE 590 Internal Dosimetry

70 pts Homework: #3 Date: February 19, 2018 Date Due: February 28, 2018 1. What annual effective dose equivalent to the lungs would you receive from 210Po by

smoking one pack of cigarettes per day? Calculate this first analytically; then modify the Stella lung model provided to perform the same calculation and compare. Define any assumptions you make. The activity inhaled per pack is 123 mBq. (20 pts)

2. As you probably know, natural potassium, which we consume every day, contains small amounts of 40K. Assume you have the following breakfast: a few dried apricots, a banana, a glass of orange juice, and a bowl of bran flakes. Then for lunch, you consume a glass of skim milk, a medium potato, a pinch of potassium chloride as a salt substitute and a 3 oz. chicken breast. Each of the following contains the stated activity of 40K:

a few dried apricots 409 pCi a fresh banana 368 pCi a glass of orange juice 409 pCi a bowl of bran flakes 155 pCi a glass of skim milk 285 pCi a medium potato 690 pCi a pinch of salt substitute 499 pCi 3 oz. chicken breast 180 pCi

a. Based on your breakfast and lunch menu, the intake data above, and referencing ICRP

30 and 38 for any parameters you need, determine your 40K committed effective dose from ingestion. (20 pts)

b. Now assume that the same activity of 40K was inhaled. Using ICRP 38 as a reference, and defining any assumptions you make, analytically calculate your committed effective dose. Then construct a STELLA model to determine the integrated activity in your body (nt) as a function of time and estimate your committed effective dose (again, state any assumptions you’ve made). (20 pts)

c. Finally, use your results to estimate an ingestion ALI, and the inhalation ALI and DAC for 40K. Compare those values with what’s published in the metabolic data. (20 pts)