Determine if beta particles from 3H, 14C, or 35S can be detected through a 1.7-mg/cm2 - thick window 2 cm away from the source
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- Po-210 is an alpha emitter with a half-life of 138 days. Howmany grams of Po-210 remain after 552 days if the sampleinitially contained 5.80 g of Po-210?Would it be more difficult to meet a 70 ppb one hour averaged standard or 70 ppb 8-hr averaged standard and why?Explain how acetaminopen gives such spectroscopic and chromatographic graph by interpreting the peaks that appeared in the graphs. Fig1. Mass Spectrometric Chromatogram of Acetaminophen (the two graphs) Fig2. IR Spectrograph of Acetaminophen
- A chromatographic separation of four compounds gave the following results. The dead time (tm) is 16.7 sec. (a) What is the capacity factor for analyte 4? (b) What is the resolution factor for analytes 3 and 4?In kool aid chromatography, what factors affect the efficiency of the column? Also discuss the Van-Deemter equation.Using a P-1000 micropipette, you transfer 800 microliter of ddH2O to a beaker and measure its weight. It turns out to be only 780 milligram; what is the percent error of this micropipette?
- A 523.1-mg sample of impure KBr is treated with excess AgNO3 and 814.5 mg AgBr (187.774 g/mol) is obtained. What is the purity of the KBr (119.002 g/mol)?A sample to be used for medical imaging is labeled with 18F,which has a half-life of 110 min. What percentage of the originalactivity in the sample remains after 300 min?Elemental gold is being recovered by electrodeposition from a solution with tiny amounts of Au(III). Holding other factors constant, what can be done to maximize the yield of recovered gold?
- The doctor ordered Oxacillin 650mg every 6 hours. The instructions on the 2gm vial states to reconstitute with powder with 11.5ml of sterile water for injection, yielding 220mg/1.5ml. How many ml will you administer? using dimensional analysis and show workThe wavelength for cobalt (II) chloride is set to 549 nm. Why is this wavelength being used?A clinical technician finds that the activity of a sodium-24 sample is 1088 cpm. What will be the activity of the sample 90. h later if the half-life of sodium-24 is 15 h?