Radioactivity and Radiation Detectors - One Line Questions

1. The Curie (Ci) is an older unit of radioactivity. 1 Ci is equal to: — 3.7 x 10^10 Bq
2. What is the main component of the detector in a scintillation counter? — A scintillating material
3. What is the primary difference between absorbed dose and equivalent dose? — Equivalent dose accounts for the biological effectiveness of different types of radiation.
4. Which type of radioactive emission consists of a helium nucleus (2 protons and 2 neutrons)? — Alpha (α) particles
5. The emission of a neutron from an atomic nucleus is called: — Neutron emission
6. The decay of a neutron into a proton, an electron, and an antineutrino is an example of: — Beta-minus decay
7. When a nucleus emits a positron, it is undergoing: — Beta-plus decay
8. Electron capture is a process where a nucleus absorbs an inner orbital electron, converting a proton into a neutron. This is a form of: — Electron capture decay
9. Which of the following is NOT a fundamental type of radioactive emission? — Proton
10. Which type of radiation has the highest penetrating power? — Gamma rays
11. Which type of radiation has the highest ionizing power? — Alpha particles
12. Which type of radiation is produced when a positron annihilates with an electron? — Gamma rays
13. In nuclear medicine imaging techniques like PET scans, what type of radiation is detected? — Gamma rays
14. Gamma (γ) rays are: — Electromagnetic radiation
15. A cloud chamber allows the visualization of the paths of charged particles due to: — Condensation of vapor on ions
16. What is the primary principle behind a bubble chamber, another type of particle detector? — Formation of bubbles in a superheated liquid
17. A semiconductor detector typically uses a material like silicon or germanium. When radiation interacts with this material, it creates: — Electron-hole pairs
18. Which scientist discovered polonium and radium, and coined the term 'radioactivity'? — Marie Curie
19. Which type of radiation detector is particularly useful for detecting gamma rays and charged particles with high energy resolution? — Semiconductor detector
20. Which type of radiation detector is often used to detect alpha particles due to their short range and high ionization density? — Ionization chamber
21. Which type of radiation detector is most suitable for measuring the absorbed dose of radiation? — Ionization chamber
22. Which type of detector is most sensitive to detecting neutrons? — Scintillation detector with a lithium-6 or boron compound
23. Which type of radiation detector is often used in PET scanners to detect the coincident gamma rays produced by positron annihilation? — Scintillation detector
24. What is the unit of radioactivity, defined as one decay per second? — Becquerel (Bq)
25. When ionizing radiation passes through a scintillating material, it causes the material to: — Emit light (scintillate)
26. Beta (β) particles are essentially: — Electrons or positrons
27. What is the main advantage of using a semiconductor detector over a gas-filled detector for spectroscopy? — Better energy resolution
28. The tracks observed in a cloud chamber are formed by: — Ionization of the supersaturated vapor
29. Which of the following is a characteristic of radioactive decay? — It is a spontaneous nuclear process
30. Which scientist discovered the neutron? — James Chadwick
31. Which of the following is a characteristic of alpha particles? — High ionizing power, low penetrating power
32. An ionization chamber measures the total charge produced by ionization in a gas. It is most sensitive to: — Low levels of high-energy radiation
33. What is the typical range of alpha particles in air? — Centimeters
34. Who is credited with the discovery of radioactivity? — Henri Becquerel
35. The time taken for half of the radioactive atoms in a sample to decay is known as: — Half-life
36. Which of the following is a common application of radioactivity detection? — Detecting smoke in smoke detectors
37. The process by which an unstable atomic nucleus loses energy by emitting radiation is called: — Radioactive decay
38. In a Geiger-Müller counter, the detection of radiation is based on the ionization of a gas in a tube. What is the primary process that occurs? — Avalanche effect
39. The phenomenon where a high-energy photon interacts with the nucleus of an atom and creates an electron-positron pair is called: — Pair production
40. The Gray (Gy) is the SI unit for: — Absorbed dose
41. The Sievert (Sv) is the SI unit for: — Equivalent dose
42. The 'dead time' in a radiation detector refers to: — The time during which the detector is insensitive to further events
43. What is the 'activity' of a radioactive sample? — The rate at which the sample emits radiation
44. Which of the following is a property of gamma rays? — They have no charge and no mass.
45. What is the primary function of a proportional counter? — To provide an output pulse proportional to the energy deposited by the radiation
46. What is the purpose of a photomultiplier tube (PMT) in conjunction with a scintillation detector? — To amplify the weak light signal produced by scintillation
47. A Geiger-Müller counter is a device used to detect: — Ionizing radiation
48. Which of the following is a common application of semiconductor detectors in nuclear physics? — High-resolution spectroscopy of gamma rays and charged particles
49. Which of the following is a medical application of radioactive isotopes? — Radiotherapy for cancer treatment
All One Line Questions
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