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Analytical Instrumentation MCQ Question Set 9

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1. The first gamma camera is also known by which of the following names?




2. Which of the following is not a component of gamma camera?




3. Which of the following is the first object that an emitted gamma photon encounters after exciting the body?




4. Which of the following is a pattern of holes through gamma ray absorbing material, usually lead or tungsten?




5. When the energy of an absorbed gamma photon is released, a flash of light is produced. This is similar to which of the following effects?




6. Which of the following components adds all the signals and determines where each scintillation event occurred in the detector?




7. Gamma camera uses one scintillation detector.




8. Gamma camera uses which of these components to produce a position intensity picture of a radioactive area?




9. Which of the following is known as a scintillation counter?




10. Straight bore collimator is used for thyroid work in the medical field.




11. In liquid scintillation counter, which of the following is a fluorescent substance?




12. When UV light is absorbed by the fluor molecules the light emitted is in which of the following colours?




13. In liquid scintillation counter, which of the following is used to convert light into electrical signals?




14. The reduction in counting efficiency of the scintillation detector is called as ______




15. Which of the following is not a type of quenching?




16. In which type of quenching, the radiation emitted by the isotope is not detected due to absorption of the radiation by the sample itself?




17. Variation of gain with temperature does not cause instability.




18. Due to the presence of red, green and yellow colour in the vial, which of the following occurs?




19. A quench curve can be constructed by plotting the counting efficiency versus _________




20. Photomultipliers used in Liquid scintillation detectors are a source of instability.




21. A discriminator circuit is which of the following circuits?




22. Which of the following is the function of the discriminator?




23. The difference between the pulses having amplitudes between the two triggering levels is called ______




24. The pulses having amplitudes between the two triggering levels are given by which of the following components?




25. Schmitt triggers are followed by which of the following components?




26. Which of the following components cancels all the pulses which trigger both the discriminators?




27. Which of the following is used when the number of channels is ten or less?




28. If number of channels is more than ten, the problems of stability of discrimination voltages arise.




29. The signal reaching which of the following components is the one lying in the window of pulse height analyser?




30. The measurement of pulse height is useful for energy determination.




31. In X-ray spectrometers, the specimen or the sample is placed after which of the following components?




32. Which of the following components are used to generate X-rays?




33. Using which of the following components is the generated x-rays focussed upon the specimen?




34. The cathode in the Coolidge tube is made of which of the following elements?




35. The cathode in the Coolidge tube is kept in an inclined manner.




36. Which of the following is not a target metal used in the Coolidge tube?




37. How can the resolution of the collimator be increased?




38. When x-rays emitted from molybdenum are allowed to pass through a zirconium filter, which of the following occurs?




39. When compared to filters, monochromators provide much signal to noise ratio.




40. Which of the following crystals are not suited for x-ray grating?




41. The x-rays generated come out of the Coolidge tube through which of the following?




42. X-ray diffractometers are not used to identify the physical properties of which of the following?




43. X-ray diffractometers provide ____________ information about the compounds present in a solid sample.




44. Using the powder method of diffractometers, which of the following can be determined?




45. In powder method, the powder sample is contained in which of the following?




46. Which of the following is the most common instrument for photographic recording of diffraction patterns?




47. With the help of which of the following equations is the distance calculated from a known wavelength of the source and measured angle?




48. In Diffractometer, the identification of a component of the sample from its powder diffraction pattern is based upon the _________ of lines and their relative _______




49. When certain geometric requirements are met, X-rays scattered from a crystalline solid can constructively interfere with each other and produce a diffracted beam.




50. Diffractometers are similar to which of the following?