The radioactive isotope I-131 is used in the treatment of hyperthyroidism. When administered to a patient, I-131 accumulates in the thyroid gland, where it decays and kills part of that gland. (a) Suppose that it takes 72 hours to ship I-131 from the producer to the hospital. What percentage of the original amount shipped actually arrives at the hospital? (See Exercise 7.) (b) If the I-131 is stored at the hospital for an additional 48 hours before it is used, how much of the original amount shipped from the producer is left when it is used? (c) How long will it take for the I-131 to decay completely so that the remnants can be thrown away without special precautions?

Math 1432 Section 15738 MWF 10-11am SEC 100 Dr. Melahat Almus almus@math.uh.edu http://www.math.uh.edu/~almus COURSE WEBSITE: http://www.math.uh.edu/~almus/1432_fall16.html and www.casa.uh.edu Visit CASA regularly for announcements and course material. Due dates and announcements will be posted on the calendar at CASA. Read the syllabus posted on the course website. If you email me, please mention the course (1432) in the subject line. 1 Policies- Read the syllabus! Must have a CASA account. Everyone has free access until the access code deadline. Pur