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- Fluorine-18, which has a half-life of 110 min, is used in PET scans. If 129 mg of fluorine-18 is shipped at 8:00 a.m., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:30 p.m.? (enter answer with one place after the decimal)For intitial radioactivity, 1 is the highest and 4 is the lowest(5): The pKa of HF is 3.167. What is Kb for F¯ ?
- If a match contained 0.265 g of P4S3, what would be the energy released in kJ?co-60 is used for radiation therapy as implants and as external source of radiation exposure. The half life of Co-60 is 5,272 years. how much of a 2.000 mg sample will remain after 21,088 years? Please show work.Assuming that the global amount of radiocarbon is constant, decaying Carbon-14 is repeatedly restored in organisms while they are alive. However, when an organism dies, the amount of Carbon-14 begins to decrease as it decays to Nitrogen-14. A peat bed sample is found to have 6% of Carbon-14 remaining from a specific type of bivalve shells. How old is the peat bed?
- activity 5A sealed flask contains saturated sodium iodide with excess solid at the bottom of the flask. If a sample of radioactively labelled NaI(s) is added to the system, the most likely observation after 24 hours will be Select one: A. neither the NaI(s) nor the only the NaI(aq) will register as radioactive B. both the NaI(s) and the NaI(aq) will register as radioactive C. only the NaI(aq) will register as radioactive D. only the NaI(s) will register as radioactive Use the following information to answer the next question. Crystals of magnesium phosphate and glucose, C6H12O6(s), were dissolved together in a beaker of distilled water. All the entities that will be present when the two compounds are added to water are Select one: A. Mg2+(s), PO43-(s), C6H12O6(aq), H2O(l) B. Mg2+(aq), PO43-(aq), C6H12O6(s), H2O(l) C. Mg3(PO4)2(aq), C6H12O6(s), H2O(l) D. Mg3(PO4)2(s), C6H12O6(aq), H2O(l)The smallest C-14 activity that can be measured is about 0.20%. If C-14 is used to date an object, the object must have died within how many years?
- Stephanie is a radiation worker, as part of her job she spent 2 weeks fixing a valve in high level radiation area. It was noticed that Xe-133 was released and the monitor indicated a concentration of 3.3 Ci/ cm3. If inhalation DCF forXe-133 is 2.5 mSv/ Bq, what is the dose received by Stephanie as part of her job?Strontium-90 is a dangerous by-product of atomic testing because it mimics the action of calcium in the body. It decay in two B-emissions to give zirconium-90. Write a balanced nuclear equation for the overall decay of Sr-90. Calculate ◇m in grams when one mole of Sr-90 decays to Zr-90. How much energy (in KJ) is given off by the decay of 6.50 mg of Sr-90?When reactor 4 at the Chernobyl Nuclear Power Station in Ukraine exploded at 1:23 p.m. on April 26, 1986, a great plume of radioactive isotopes erupted into the air and spread for thousands of miles. Most of the isotopes emitted immediately following the blast were of the element iodine. Which of the glands of the endocrine system would be most seriously—and immediately— affected by the blast, and how do you think this would become evident in the nearby population?