Introduction To Radiation Detectors

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| By Beharrykn
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Beharrykn
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Quizzes Created: 1 | Total Attempts: 725
Questions: 11 | Attempts: 725

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Questions and Answers
  • 1. 

    Since radiation cannot be seen seen, smelt, or tasted How do radiation protection technicians detect ionizing radiation

    • A.

      RP technicians look at the signs of radiation sickness from personnel in order to indicate the presence of ionizing radiation

    • B.

      RP technicians are dependent on instruments to indicate the presence of ionizing radiation

    • C.

      There is no way to detect ionizing radiation

    • D.

      It is a guessing game. It is naturally assumed that any radiation facility will always have radiation exposure

    Correct Answer
    B. RP technicians are dependent on instruments to indicate the presence of ionizing radiation
    Explanation
    RP technicians are dependent on instruments to indicate the presence of ionizing radiation because radiation itself cannot be directly sensed by human senses. These instruments are specifically designed to detect and measure radiation levels, providing quantitative data that helps technicians assess the presence and intensity of ionizing radiation. This allows them to take appropriate measures to protect themselves and others from potential harm.

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  • 2. 

    Radiation can be represented in what form

    • A.

      Radiation is energy traveling in the form of particles or waves in bundles of energy called photons

    • B.

      Radiation is solely a particle

    • C.

      Radiation can only be described as a wave

    • D.

      Radiation does not carry any energy and therefore there is no form or representation

    Correct Answer
    A. Radiation is energy traveling in the form of particles or waves in bundles of energy called photons
    Explanation
    Radiation can be represented in the form of particles or waves in bundles of energy called photons. This means that radiation can exist in both particle and wave forms, depending on how it is observed or measured. The energy of radiation is carried by photons, which are discrete packets of energy. Therefore, radiation can be described as both particle-like and wave-like, and it travels in the form of particles or waves.

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  • 3. 

    Radioactivity is not natural and it does not occur spontaneously

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The statement given in the question is incorrect. Radioactivity is a natural phenomenon and it does occur spontaneously. Radioactive decay is a process in which unstable atomic nuclei release radiation in the form of particles or electromagnetic waves. This process happens naturally in certain elements, such as uranium and radium, and it is not dependent on any external factors. Therefore, the correct answer is False.

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  • 4. 

    What happens when ionizing radiation interact with materials

    • A.

      Ionizing radiation has no effect on materials

    • B.

      Ionizing radiation only affects the nucleus of atoms that constitute a material

    • C.

      Ionizing radiation can remove electrons from the atoms in the material

    • D.

      Ionizing radiation can interact with materials but the materials are always neutral and never become ionized

    Correct Answer
    C. Ionizing radiation can remove electrons from the atoms in the material
    Explanation
    When ionizing radiation interacts with materials, it has the ability to remove electrons from the atoms in the material. This process is called ionization, where the radiation transfers enough energy to the atoms to knock off one or more electrons, resulting in the formation of charged particles called ions. This interaction can cause various effects on the material, such as changes in its chemical properties, damage to its molecular structure, or even DNA damage in living organisms.

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  • 5. 

    Gas filled detectors works on the principle that as radiation passes through air or a specific gas, ionization of the molecules in the air occur

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Gas filled detectors, such as Geiger-Muller counters, operate based on the principle that when radiation passes through air or a specific gas, it ionizes the molecules in the air. This ionization generates electrical signals that can be detected and measured, allowing for the detection and quantification of radiation levels. Therefore, the statement is true.

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  • 6. 

    The positive side of the gas filled detector is referred to as the cathode

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The positive side of the gas-filled detector is not referred to as the cathode. In a gas-filled detector, the cathode is the negative electrode, while the positive side is referred to as the anode. The cathode emits electrons, while the anode collects them. Therefore, the statement is false.

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  • 7. 

    Electrons are negatively charged and therefore they are attracted to a positive plate

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Electrons, being negatively charged particles, are naturally attracted to positively charged objects. In this case, the positive plate acts as a magnet for the electrons, pulling them towards it. Therefore, the statement is true.

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  • 8. 

    What is meant by an atom being ionized

    • A.

      Atom absorbs a great deal of energy

    • B.

      Atom loses protons and the ionized atom becomes negatively charged

    • C.

      An atom loses an electron and the ionized atom thus becomes positively charged

    • D.

      The atom is affected by ionizing radiation but still has no charge

    Correct Answer
    C. An atom loses an electron and the ionized atom thus becomes positively charged
    Explanation
    When an atom is ionized, it means that it loses an electron, resulting in a positively charged ion. This occurs when the atom gains enough energy to remove one or more electrons from its outer shell. The loss of an electron creates an imbalance in the atom's positive and negative charges, leading to a positively charged ion.

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  • 9. 

    In gas filled detectors How is a current formed that goes to the detector

    • A.

      Free electrons will travel to the anode which is then collected and form a small current in the wires going to the detector

    • B.

      The positive charges are collected by the anode which then forms a current in the wires that goes to the detector

    • C.

      The free electrons travel to the cathode and is it collected to create a small current

    • D.

      The current already exists in the detector

    Correct Answer
    A. Free electrons will travel to the anode which is then collected and form a small current in the wires going to the detector
    Explanation
    In gas filled detectors, free electrons are produced when ionizing radiation interacts with the gas. These free electrons then travel towards the positively charged anode. As they reach the anode, they are collected and form a small current in the wires connected to the detector. This current is then used to measure and detect the presence of the ionizing radiation.

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  • 10. 

    In a scintillation detector The most common type of material is a type of salt called sodium iodide

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The most common type of material used in a scintillation detector is sodium iodide. Sodium iodide is a type of salt that has excellent scintillation properties, meaning it produces flashes of light when it interacts with radiation. This property makes it ideal for detecting and measuring ionizing radiation in various applications such as medical imaging, environmental monitoring, and nuclear physics research. Sodium iodide scintillation detectors are widely used due to their high sensitivity, efficiency, and relatively low cost compared to other scintillator materials.

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  • 11. 

    What is the purpose of the photocathode in the scintillation detector

    • A.

      The photo-cathode produces photons

    • B.

      The photocathode takes periodic photos of the cathode

    • C.

      The photocathode produces electrons when light strikes its surface

    • D.

      The photocathode provides structural support for the photomultiplier tube since it is at the base

    Correct Answer
    C. The photocathode produces electrons when light strikes its surface
    Explanation
    The photocathode in the scintillation detector serves the purpose of producing electrons when light strikes its surface. This process is known as photoemission. When photons from the scintillation event interact with the photocathode, they transfer their energy to the electrons in the material, causing them to be emitted. These emitted electrons can then be accelerated and detected by the photomultiplier tube, allowing for the measurement of the scintillation event.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Aug 23, 2012
    Quiz Created by
    Beharrykn
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