Chapter 1, Problem 8Q

Question 21 of 28 What does PET stand for in the medical technique PET scan? A) proton emission tomography B) positron emission tomography C) proton ejection therapy D) positron ejection therapy E) positron excitation therapy

If it takes 10,000 atoms detected to make a measurement accurate to 1% of the current abundance, starting with 1 miligram of carbon in which 1% by number is 14C, what would be the maximum age at which dating could be made and what would be the error in the dating when the sample measurement error is 1%? Explain your work.  In practice this is far longer than can be achieved accurately, not because the atoms cannot be found, but because samples mix with their environment, and the intial levels of radiocarbon are variable and cannot be established with high accuracy.  Instead, for ages over about 50,000 years radioactive isotopes of other elements are used to date samples that have been isolated well from sources that could change their concentration. Use your own words in responding and cite any sources you use other than the lab class website. Please respond to this question by uploading one "PDF" file.  We may not be able to view images or other file formats.

QUESTION 3 What are the merits and limitations of precipitation methods? Give an example where the precipitation method cannot be applied to separate two radioisotopes. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph Arial 10pt ... Is ABC 田田 图田用田 区