In ionization chamber method, the total amount of radiation is proportional to:

1. the amount of radioactve substance
2. pressure of air between the plates
3. the total amount of electric charge passing between the plates in a given time.
4. none of these
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Answer: C
Explanation:
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Geiger-Muller Counter is used for detecting and measuring the radiations of:

1. α-rays
2. β-rays
3. γ-rays
4. all of these
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Answer: D
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In Geiger-Muller Counter, each electrical pulse marks the entry of:

1. one α- or β-particle
2. 100 α- or β-particles
3. radioactive intensity
4. none of these
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Answer: A
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In Geiger-Muller Counter, one "count" is directly due to:

1. a primary electron
2. a secondary electron
3. a beta particle
4. many electrons and ions
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Answer: D
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In Scintillation counter method used for the measurement of radioactivity, the alpha particles are detected and counted from:

1. flashes of light on a fluorescent screen
2. the total amount of ionization
3. the total amount of electric charge
4. none of these
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Answer: A
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Which of the following instrument was used by Rutherford for the detection and counting of alpha particles?

1. Geiger-muller counter
2. spinthariscope
3. spectroscope
4. none of these
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Answer: B
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A modern scintillation counter make use of ----------- for the measurement of radiation:

1. zinc sulphide screen
2. a crystal of sodium iodide with little thalium iodide
3. ionization chamber
4. dosimeter
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Answer: B
Explanation:
• In modern scintillation counter instead of zinc sulphide screen, a crystal of sodium iodide with little thalium iodide is employed.
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A modern scintillation counter can measure radiations upto:

1. 500 to 1000 per second
2. 50 to 200 per second
3. 100 to 1000 per second
4. a million per second
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Answer: D
Explanation:
• A simple scintillation counter make use of Zinc sulphide screen and can measure radiations upto 50 to 200 per second, but modern scintillation counter uses photoelectric cell and can measure radiations upto a million per second.
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Which of the following device is used to monitor the extent of exposure of persons working in the vicinity of radiation.

1. Geiger-muller counter
2. spinthariscope
3. Film Badge
4. scintillation counter
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Answer: C
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Which one of the following radiations, darken the photographic film in a film badge?

1. α-rays
2. β-rays
3. γ-rays
4. all of these
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Answer: C
Explanation:
• Alpha and beta-rays pass through the film and leave a track of black particles while gamma rays darken the film.
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