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

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Q. The reduction in counting efficiency of the scintillation detector is called as __________

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

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

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

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

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Q. A quench curve can be constructed by plotting the counting efficiency versus ____________

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

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

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

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