Strontium-90 (90Sr) is a by-product of nuclear fission with a half-life of approximately 28.9 yr. After the Chernobyl nuclear reactor accident in 1986, large areas surrounding the site were contaminated with 90Sr. If 10 ug (micrograms) of 90Sr is present in a sample, the function A(f) = 10 function for the given values of t and interpret the meaning in context. Round to 3 decimal places if necessary. (See Example 5) /28.9 gives the amount A(t) (in µg) present after t years. Evaluate the a. A(28.9) b. A(57.8) C. A(100)

QUESTION 2 A sample of the radioactive isotope PL-50 has a half life of 1500 years. How long does it take for this sample to decay to 84% of the original sample? For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph Arial 10pt Tx XOG

In 2006, the murder of Alexander Litvinenko, a Russian dissident, was thought to be by poisoning from the rare and highly radioactive element polonium-210 (210P0). The half-life of 210PO is 138.4 yr. If 0.1 mg of 210PO is present in a sample then |A(t) = 0.1 and interpret the meaning in context. Round to 3 decimal places if necessary. t/138.4 gives the amount A(t) (in mg) present after t years. Evaluate the function for the given values of t a. A(138.4) b. A(276.8) C. A(500)