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- Select the best answer or answers from the choices given: The mass number of an atom is (a) equal to the number of protons it contains, (b) the sum of its protons and neutrons, (c) the sum of all of its subatomic particles, (d) the average of the mass numbers of all of its isotopes.Many radioactive isotopes are used in medicine for imaging and treatment purposes. The specific isotopes used depends on the particular organ or body system being studied (for example, Xe-133 is used to image lung function and blood flow.) Technetium-99m is a common radioactive isotope using for a variety of medical applications. It is produced from the decay of Molybdenum-99 and has a half-life of 6.01 hours. What are some of the applications of Tc-99m? While harder to access, another radioactive isotope of technetium, Tc-93, has a half-life of 2.73 hours. If it were easier to harvest, would this be a good substitute for Tc-99m? (remember to explain why for full credit) While Tc-99m has a half-life of 6.01 hours, its decay product has a half-life of 213,000 years. While the medical community considers it to be reasonably safe, within the limits of testing, does this make sense considering both chemical and biological principles? What are possible ways that you might deal with or…33 of 48 A radioisotope is all the following except an isotope with different number of neutrons from others a chemical that either glows in the dark or releases heat an unstable isotope that eventually changes into a different element a chemical that gives off radioactivity
- The reason why a nucleus might emit radiation is because by doing so, it forms a more stable-lower energy nucleus.True falseFigure 2.3 How many neutrons do carbon-12 and carbon-13 have, respectively?Polonium is a rare element with 33 radioisotopes. The most common one, 210Po, has 82 protons and 128 neutrons. When 210Po decays, it emits an alpha particle, which is a helium nucleus (2 protons and 2 neutrons). 210Po decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. For example, they can be stopped by a single sheet of paper or a few inches of air. That is one reason that authorities failed to discover toxic amounts of 210Po in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006. What element does an atom of 210Po become after it emits an alpha particle?
- For this homework question I have been having difficulty figuring out what the atomic mass is for Gi + ^2 because it has 40 electrons and the heavier isotope has 42 neutrons and has a 2 new neutronsA chest x-ray exposes you to roughly 40 millirems of radiation. How many chest x- rays would you need to get in order to increase your lifetime risk of cancer by approximately 1%? 6. 62 625 6250C-12 and C-13 differ by the number of electrons with C-13 having an extra electron in the outer most shell. True False
- HydrogenTechnetium-99m (99m Tc) is a radioactive isotope commonly used in medical diagnosis. It emits gamma rays with a half-life of 6.0058 hours. A sample with activity 8.5 × 108 Bq is injected into a patient What percentage of this activity will remain after 28 hours? Give your answer as a percentage to 1 decimal place. Percentage of activity remaining: %CH2OH NONE H3C-C-H Isotope tracing. Indicate where the OH label would appear in the products. If the product would not contain a label, write ÓH H3C- ČO- CO- CH2OH "NONE" over that CH2OH H2C * product. CH2 OH но Но ČH2OH C=0 ÓH Но ČO- С сооо CH2 HO-C-coo CH2 cooo çoo CH2 光. *CH2 cooe но 1 turn of the TCA O=0