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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Q. The difference between the pulses having amplitudes between the two triggering levels is called __________

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

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

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

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

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

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

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

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