1. Name three advantages of in-situ tests and two disadvantages compared to laboratory tests. 2. Name two advantages of the SPT test over the CPT test.
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- 4. Modern physics. Please provide a clear, correct, and well explained solution for the following9. Cadmium-107 has a half life of 6.52 hours. If you start off with sample which has an activity of 1.0×1010 Bq, what will the activity in Bq be after the following times (a) 6.52 hours; (b) 3 days.3. The half-life of l-137 is 8.07 days. If 25 grams are left after 40.35 days, how many grams were in the original sample?
- 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?3. A radiation worker stands 50 cm away from a radioactive source of 25 mCi 57Co. Calculate the exposure value received by the worker while standing for 2 hr near the source. The isotop half-life is 271.8 days.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 ?
- A radiation worker stands 50 cm away from a radioactive source of 25 mCi 57Co. Calculate the exposure value received by the worker while standing for 1 hr near the source. The isotop half-life is 271.8 days. can you use the formulas from the pictures please? thank youExplain the principles behind X-ray radiotherapy treatment of malignant tumours. Describe how treatment is optimised to reduce damage to healthy tissue.RADIOACTIVITY. LAW OF RADIOACTIVE DECAY Activity units: 1 Ci = 3.7 × 1010 Bq 1. Nuclear decay law: N = Noe-At The law of radioactive decay gives the quantitative relationship between the original number of nuclei present at time zero No and the number N at a later time t (sec), where e = 2.71828... is the base of the natural logarithm, and 2 is the decay constant for the nuclide (1/s). 2. Relationship between decay constant 1 and isotop half-life T1/2: In(2) 0.693 Modality Radioisotope Carbon-11 Half-life T1/2 where 1 is decay constant (1/s), T1/2 is isotope half- life (s). T1/2 20 minutes PET Fluorine-18 110 minutes PET 12.7 hours Copper-64 Gallium-67 PET 3. Activity or decay rate of a radioactive source A: ΔΝ 78.3 hours SPECT Gallium-68 68 minutes PET = AN Technetum-99m 6.02 hours SPECT Δt where A is activity or decay rate of a radioactive source (Bq), N is number of nuclei present at time t (s ), A is decay constant (1/s). 4. Activity A of a radioactive source at a time t:…
- 1. Find the radiation dose, in grays, for each of the following a. A 5.5-mSv fluoroscopic x-ray series, with a relative biological effectiveness of 1. b. 45 mSv of skin exposure by an α emitter, with relative biological effectiveness of 20. c. 148 mSv of β– and γ rays from the 40K in your body, both of which have a relative biological effectiveness of 1. [please answer all parts to the question]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 ?question 4 please