RAD Midterm 1 TCDHA

RAD Midterm 1 TCDHA A form of energy carried by waves or streams of particles is defined as... - Radiation The x-ray was discovered by... - Wilhelm Roentgen Who MODIFIED the paralleling technique with the introduction of the long-cone technique? - F. Gordon Fitzgerald Which of the following would you place in the patient's mouth in order to take dental x-rays? a) Image b) Image Receptor c) Radiograph d) Dental radiograph - b. Image Receptor Which subatomic particle carries a negative electrical charge? a) A Neutron b) A Proton c) An Electron d) A Nucleon - c. An Electron What is the binding energy or binding force of an electron is... - Determined by the distance between the orbiting electrons and the nucleus A spontaneous emission of radiation from the disintegration of unstable atomic nuclei is... - Radioactivity Cathode rays are derived from which of the following types of particulate radiation? a. Electrons b. Alpha Particles c. Protons d. alpha particle decay - a. Electrons What type of radiation includes x-rays and visible light? - Electromagnetic Approximately what percentage of the kinetic energy of the electrons is converted to x-rays at the anode? - Less than 1% What restricts the size of the x-ray beam? - The Lead Collimator Which form of the x-ray beam is more detrimental to the patient and operator? - Scatter Radiation What happens with the electrons when the kilovoltage is increased? - The electrons moves from the CATHODE to the ANODE with more speed Higher-energy x-ray beam with increased penetrating ability results by... - When the kilovolt is increased (1) Density is the overall darkness or blackness of a dental image. (2) When the kilovoltage is increased while other exposure factors remain constant, the resultant image exhibits a decreased density and appears lighter. a. Both statement are true b. Both statement are false c. The first statement is true; the second statement is false - c. The first statement is true; the second statement is false What controls the quantity of x-rays produced? - Milliamperage (mA) In regard to increasing density: - An increase in either kVp or mA will increase density. According to inverse square law, the intensity of radiation is ________ proportional to the _________ from the source of radiation. - Inversely; square of the distance Aluminium filters are used to remove ________ -energy, _________ wavelength x-rays. - Low; Longer What specific mechanism of radiation injury may result in the formation of hydrogen peroxide when x-ray energy is absorbed by patients? - Free radical formation created by the ionization of water may occur. What is associated with long-term radiation effects? - Small amounts of radiation absorbed over a long period.