Q. Which of the following gases are used in the proportional counter as the ionising gas?

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Q. Which of the following is the main disadvantage of solid state semiconductor detector?

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Q. Scintillation detector is a large flat crystal of which of the following materials?

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Q. When X-ray enters the solid state detector it produces ion pair rather than electron-hole pair.

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Q. Which of the following materials are used as the insulation between the inner and outer electrodes of the ion chamber?

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Q. Liquid samples must be counted using ionization chamber by placing them in which of the following?

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Q. Gaseous compounds containing radioactive sources can be directly introduced into the ionization chamber.

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Q. Liquid Scintillators are used for which of the following materials?

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

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

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

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

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Q. 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?

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

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Q. Gamma camera uses one scintillation detector.

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

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

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

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

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

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