6. Calculate the thickness of lead required to reduce the exposure rate of Cs-137 at a point 4 inches from the source of 12 mR/hr to 0.752 mR/hr. X = (log(11/12) HVL)/(log2)
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- 250 mA and .2 sec creates a good radiograph of a lateral thoracic spine withappropriate exposure to the IR. The technologist wants to modify this technique to give the patient time to breathe during the exposure. If the time is changed to 2 seconds, what new mA will maintain exposure?15. An IV infusion is administered to a 120 lb patient by IV infusion at a rate of 1.8 mg/kg/hr. The drug has a half-life of 8 hours and distributes into a volume of 15 L. a) Find the concentration function C(t) while the infusion is being administered. b) Find the loading dose required to make C(1) a constant if the infusion continues. c) If the loading dose from part b is given followed by 24 hours of infusion at 1.8 mg/kg/hr, graph the concentration for the first 48 hours. d) If the loading dose from part b is given followed by 24 hours of infusion at 1.8 mg/kg/hr, how long will the concentration remain within the therapeutic window of 50-100 mcg/ml?S Scho X S Post- X d AI2 S x G The fx G rocke x S How bcps.schoology.com/common-assessment-delivery/start/6425623769?action=onresume&submissionid=969196920 NGLSync Portal Ho... S week of 12/20 Meet- nfw-jxsi-wtd Post-Assessment Unit 1 LC2 Potential Energy This Potential Energy Diagram represents an exothermic reaction; excess energy is released when the products are formed. A B C Reaction Coordinate 71 D The potential energy of the reactants is represented by the letter # The potential energy of the products is represented by the letter с E Highlight $ Quizizz CP CPM eBooks Index... % A O Mycoplasma pneu.... & a Qui 1 2 0
- Technetium-99 m has a half life of 4.8 hours. If a patient receives a dose with an activity of 60.2 mCi of Technetium 99 for cardiac imaging how much radioactivity will be left in the patients body 48 hours after injection?If the gamma-ray dose rate is 50 mSv hr-1 at a distance of 1.0 m from a source, what is the dose rate at a distance of 10 m from the source?technetium half life is 4.8 hours. If a patient receicves a dose with an activity of 35.9 mCi of technetium for cardiac imaging how much radioactivity will be left in the patient's body 96 hours after injection?
- 2. Consider two gamma radioactive sources: S1 has activity 50 µCi (micro-Curie) and S2 has activity 25 µCi (micro-Curie). They are separated by 1 m. Assume that both sources are pointlike. s1 S2 1 m a) At which location along the dashed line passing by the two sources is the flux due to S1 equal to the flux due to S2 ? b) What is the gamma fluence in that location in a time interval of two minutes ?9)A drug has a half-life of 6 hours. The drug is administered by I/V injection, and immediately after administration its plasma level is 136mcg/ml. Results for a blood test later on show a plasma level of 8.55mcg/ml. How many half-lives have passed?3. A GM counter has dead time of 250 s. It records 20,000 counts per minute. What is the actual count rate? [Ans. 21,820]
- 4. 500 mCi sample of radioisotope was purchased by a medical supply house. If the sample has the half-life of 15 days. How long will it keep before it's activity is reduced to 25 mCi ?asapThe intensity of radiation at 10 ft was 200 R/hr. If the technologist moved to 5 ft from the source of radiation, what would the exposure be? O a. 400 R/hr Ob. 800 R/hr Oc. 100 R/hr Od, 50 R/hr