If a hospital were storing radioisotopes, what is the minimum containment needed to protect against:(a) cobalt-60 (a strong γ emitter used for irradiation)(b) molybdenum-99 (a beta emitter used to produce technetium-99 for imaging)
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If a hospital were storing radioisotopes, what is the minimum containment needed to protect against:
(a) cobalt-60 (a strong γ emitter used for irradiation)
(b) molybdenum-99 (a beta emitter used to produce technetium-99 for imaging)
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- The image shows a whole body bone scan using MDP (mono-diphosphonate) labelled with technetium-99m. Patient is injected with 600 MBq of Tc-99 MDP Technetium-99m is a pure gamma emitter, with physical half-life of 6 hours. a) Use the data to explain why technetium 99-m is a suitable radionuclide (AC 3.1) ● b) What other information would you need to assess the suitability of Technetium-99m as a radioactive tracer. (AC 3.1) Prompt questionsAssume that you list the following types of electromagnetic radiation in order of increasing wavelength: () the gamma rays produced by a radioactive nuclide used in medical imaging: (ii) radiation from an FM radio station at 93.1 MHz on the dial; (iii) a radio signal from an AM radio station at 680 kHz on the dial; (iv) the yellow light from sodium vapor streetlights; (v) the red light of a light-emitting diode. Which one would be the second? Lütfen birini seçin: O a 680 kHz AM radio waves O b. the red light O c the yellow light O d. 93.1 MHz FM radio waves O e the gamma raysBelow is a Beer's Law Plot for the concentration of a specific colored compound x. A solution of compound X is measured with the spectrophotometer to have an optical density of 0.60. a) What is the concentration of compound X in this solution. Answers must contain proper units for full credit. b) The absorbance of this compound was measured at 540 nm. Why was this absorbance chosen? 0.9 0.8 0.7 0.6 805 4 0.4 0.3 0.2 Absorbance at 540 m
- 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?In your first paragraph you should explain the theory of chromatography in general, and the behind thin layer chromatography in detail. a) Define the terms "stationary phase" and "mobile phase" and describe how the stationary phase and the mobile phase interact with the analyte during a chromatographic separation (for chromatography in general – the same concept applies to thin layer, column, and gas chromatography). b) For what two main reasons would a chemist perform a thin layer chromatography analysis? c) define and describe the process of thin layer chromatography. Include the following terms: marking, spotting, developing, visualizing, and measuring. Include in your description several different ways that the plates can be visualized.The wavelength for cobalt (II) chloride is set to 549 nm. Why is this wavelength being used?
- Which of the following statements about AAS and AES is FALSE a)Sample used in AAS are usually in the form of aqueous solution b)In flame AAS, the flame is used for atomization as well as excitation purpose c)The graphite furnace is an example of non-flame atomizer d)In flame AES, no light source is required. What is the advantages of Axial torch configuration over Radial configuration in Inductive Couple Plasma-Optical Emission Spectrometer (ICP-OES) a)Increased radiation intensity – a longer path length b)Excellent tolerance to dissolve solids c)Can analyze S, P, and Halogens d)Excellent torch lifetimesWhat is Dry Flash Column Chromatography? Please explain at your own words( around 500 words).Justify and explain following statements. (a) Paper chromatography is a type of partition chromatography. (b) The R f value is 1. (c) Chromatography is only a qualtitative technique. (d) The adsorbent should be insoluble in the solvent. (e) Chromatography is used to separate only color compounds.
- The image shows a whole body bone scan using MDP (mono-diphosphonate) labelled with technetium-99m. • Patient is injected with 600 MBq of Tc-99 MDP • Technetium-99m is a pure gamma emitter, with physical half life of 6 hours. a) Use the data to explain why technetium 99-m is a suitable radionuclide (AC 3.1)What frequency of EM radiation is emitted when an electron in a hydrogen atom jumps from n = 3 to n = 2? ( /2)Frequency = __________× 1014 HzIn Experiment 7, Isolation of Citrus Oils, the compounds isolated were the monoterpene compounds alpha-pinene, beta-pinene, limonene, myrcene and gamma-terpinene. The citrus oils were analyzed using gas chromatography, which separates compounds based on polarity and boiling point. Column chromatography and thin layer chromatography work on similar separation principles as gas chromatography, but rely only on polarity of compounds and solvents for separation. Explain why neither column chromatography nor thin layer chromatography would be appropriate separation methods for the terpenes isolated in Experiment 7. Answer: