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X-Ray Chapter 2,3,6
Practice for state test
| Question | Answer |
|---|---|
| Interaction with the x-ray photon as a result of the photoelectric effect is harmful to the patient because ionization occurs. | The statement is true |
| The nucleus of an atom contains | Protons and neutrons |
| The purpose of the anode is to | Convert electrons into x-ray photons |
| Your patient had x-rays taken in her previous dental office. She notices that the long metal tube at the end of the x-ray head is longer than it was at the other office. What explanation would you give. | It aims and shapes the x-ray beam |
| Cathode rays are derived from which of the following types of particulate radiation? | Electrons |
| Which of the following elements is the simplest atom? | Hydrogen (H #1) |
| In the dental x-ray tube, the number of electrons created is controlled by | Milliamperage |
| Which of the following statements is true of ionizing radiation? | It is radiation that is capable of producing ions by removing or adding an electron to an atom |
| Your x-ray machine runs off 110 volts. Theoretically what would occur if there was no step-down transformer in the x-ray control panel? | Too many electrons would be produced for the purpose of dental x-rays. Only 3-5 volts are required to heat the tungsten filament |
| Which would you adjust if you wanted to produce characteristic radiation? | Kilovoltage |
| The fundamental unit of matter is the | Atom |
| Which of the following statements is true of orbits or shells in the atom? | The orbiting shell closest to the nucleus has the highest energy level |
| The binding energy or binding force of an electron is | Determined by the distance between the orbiting electrons and the nucleus |
| An ion pair results when | An electron is removed from an atom |
| Radiation is the emission and propagation of energy through space or a substance in the form of waves or particles | True |
| Radioactivity can be defined as the process by which certain unstable atoms or elements undergo spontaneous disintegration, or decay, in an effort to attain a more balanced nuclear state | True |
| Which of the following forms of electromagnetic radiation has the shortest wavelength? | Dental x-ray wave |
| Which form of the x-ray beam is most detrimental to the patient and operator? | Scatter radiation |
| Which of the following statements is true of ionization? | An atom that gains an electron has a negative charge, and an atom that loses an electron has a positive charge |
| Which of the following components of the x-ray machine would have two indicator lights? | The control panel |
| Approximately what percentage of the kinetic energy of the electrons is converted to x-rays at the anode? | Less than 1% |
| Exposure time is measured in | Impulses |
| Which of the following changes will increase x-ray beam intensity? | Decreasing the source-to-film distance |
| The position-indicating device (PID) is an extension of the | Tubehead |
| The _____________ allow(s) for positioning of the tubehead | Extension arm |
| When lower kilovoltage settings are used, an image with ____ will result | High contrast |
| You are on a mission trip, and your responsibility is to take radiographs. You are using a handheld x-ray machine, digital sensors, and a receptor holder. Sterilization is not available. Which of the following receptor holders would you use? | A Uni-bite |
| A _____________ eliminates the need for the patient to stabilize the receptor | Receptor holder |
| (1) As kilovoltage, milliamperage, and time increase, x-ray beam intensity decreases. (2) As distance and filtration increase, the intensity of the x-ray beam increases | Both statements are false |
| When the kilovoltage is increased | Electrons move from the cathode to the anode with more speed |
| When contrasted with the use of 70 kV for dental x-rays, the use of 60 kV produces | Less penetrating dental x-rays with longer wavelength |
| A beam alignment device can be used to help the dental radiographer position the PID in relation to the _____________ and the receptor | Tooth |
| When kilovolt is increased, a | Higher energy x-ray beam with increased penetrating ability results |
| Milliamperage regulates the _________ of electrons produced at the cathode filament | Quantity |
| _________________ regulate(s) the manufacture and installation of dental x-ray equipment | The federal government |
| Which of the following statements is true of the use of voltage in dental x-ray equipment? | Dental x-ray equipment requires the use of 60 to 70 kilovolts |
| Which of the following statements is true of wavelength in reference to radiation? | X-rays with longer wavelength have less penetrating power |
Created by:
Isaiflores
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