lnlormann 'l' Flag question Radioactive isotopes {radioisotopes} are extremely important for some medical tests and procedures. A common radioisotope used for medical imaging is technetium-99. Technetium-99 is used because it releases 140 keV gamma rays that are easily detected outside of the body and doesn't damage surrounding tissue. It has a short halflife and the human body easily excretes its daughter products. The short half-life that makes it safe also means that the hospital needs a constant supply. To solve this problem, scientists developed a technetium-99 generator from molybdenum-99, a by-product of spent nuclear reactor fuel. The molybdenum-99 needs replacing weekly instead of daily shipments of technetium-99. The generator starts with molybdenum99, which decays into technetium99r which can be separated by a relatively easy chemical process. As a learning exercise; a medical student is asked to monitor the decay of a molybdenum99 sample of 100 9 over a week. The student measures the folEowing values. "#55: Remaining (9.) 20 81 Tithe (hour's) 30 ?3 _ 5U 59 60 53 70 48 80 43 90 39 35 31 28 26 23 21 19 \fQuestion 5 Not yet answered Mazed out of 1.00 'i" Hag question What is the decay equation for molybdenum99 into technetium99? Motybdenum 99 decays to technetium 99 by beta decay. Paragraph 7 _ B ' 99:": . 0'15\"\" 6 The decay of technetium99 releases a 140 ke'u' gamma ray. How much mass is changed into energy to create the Mt Yet gamma ray? answered Marked out of 'kg are changed into energy to create the gamma ray, 1 .DD V, Flag queshion Answer rounded to 3 significant figures using scientic notation is necessary. Question 7 Type or upload any written work showing how you caicuiateo the mass from the previous question. not yet answered E Paragraph V B if SE lE E ('3' E\" E Marked out of 1.00 't' Flag