2. As you probably know, natural potassium, which we consume every day, contains
ID: 1088066 • Letter: 2
Question
2. As you probably know, natural potassium, which we consume every day, contains small amounts of 4°K. 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 4°K: a few dried apricots a fresh banana a glass of orange juice a bowl of bran flakes a glass of skim milk a medium potato a pinch of salt substitute 3 oz. chicken breast 409 pCi 368 pCi 409 pCi 155 pCi 285 pCi 690 pCi 499 pCi 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 4°K committed effective dose from ingestion. (20 pts) 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 b. 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)Explanation / Answer
Answer (a):
Total dosage of K(40) for breakfast and lunch: 409+368+409+155+285+690+499+180 = 2995 pCi
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