DENTAL RADIOLOGY CODA COMPLETE SOLUTIONS

DENTAL RADIOLOGY CODA COMPLETE SOLUTIONS In x-radiation, ionization occurs when an election is displaced from an atom Which of the following are found in the nucleus of the atom? protons , neutrons , electrons A gray (rad) is defined as the unit of absorbed dose of radiation per gram of tissue Which of the following cell types is the most sensitive to carcinogenics following prolonged exposure to ionizing radiation? Blood The part of an atom that carries a negative charge is a/an electron The biologic effect of ionizing radiation is related to the area exposed , dose rate , total dose Which of the following diseases is associated with long-term , low-level radiation exposure ? Leukemia The x-rays that are most likely to be absorbed by the skin are x-rays that are of long wavelength The time between exposure to x-rays and appearance of radiation damage is called the latent period The quantity (numbers) of radiation emitted is primarily dependent upon the milliamperage setting The location at which the x-rays originate in the x-ray tubehead is called the tungsten target The most dangerous time for the fetus to be exposed to x-radiation is during the first trimester If a radio-graphic film would be properly darkened in 2 seconds of exposure at 10 mA, it would obtain the same darkness in 1 second of exposure at 20 mA How often do the walls of the dental operatory need to be treated in order to remove any residual radiation that has accumulated ? Never Compared to 75 kVp, a film produced to 90 kVp will have low contrast. a long gray scale. Ionizing radiation consists of photons that travel at the speed of light. photons that travel in a wave motion. photons without mass. The ALARA concept is related to the use of the minimum exposure time and mA necessary. use of the fastest film available. When the x-ray beam exits the position indicating device, it should be no more than how many inches in diameter? 2.75 In which of the following circumstances is it considered acceptable to allow the operator to hold the radio-graphic film for a patient during exposure It is never acceptable to hold the film during exposure The primary purpose of the lead foil is an intraoral film packets is to prevent fogging of the film According to National Council of Radiation Protection standards , the annual Maximum Permissible Dose (MPD) of radiation for non-occupationally exposed adult patients is: .1 rem The collimator is composed of lead If the operator cannot leave the room during a radiographic exposure, he/she should stand 6 feet away at a 90- 135 degree angle to the central beam After a radiograhic exposure is made, radiation will be completely dissipated within a period of a fraction of a second An aluminum filter in a dental x-ray unit functions to: absorbs x-rays of long wavelength The "control" film badge should be : stored in a location that is way from all potential sources of ionizing radiation Which of the following represents the fastest speed of radiographic film F With regard to dental radiography procedures, the risk/benefit ratio indicates that: the benefits of information gained from exposure to ionizing radiation should outweigh the potential risk factors inherent within exposure . only those films with a possibility of providing diagnostic information should be prescribed. Which of the following agents are approved by the FDA as surface disinfections? Iodophor sodium hypochloride Which of the following are important in maintaining infection control? Barrier techniques handwashing with antimicrobial appropriate waste disposal use of disposables If the floor of a patient's mandible is shallow, in order to expose a diagnostically acceptable radiograph, the negative vertical angulation should be increased Compared to that used for adults , the x-ray exposure time for children should be shorter Which radiographic technique requires relatively reater extremes in positive and negative angulation? Bisecting the Angel technique (short cone) When using film holding devices, you are primarily exposing radiographs with which technique? the paralleling (long cone) technique When used correctly, a rectangular collimating device will reduce unnecessary radiation When exposing an inraoral radiograph, gagging is most likely to occur during which of the following projections? Maxillary molar Compared to the bisecting angle technique (short cone), the paralleling technique (long cone) of exposing radiographs produces an image with decreased distortion A long source-object distance is recommend because it reduces image magnification Which of the following types of radiographs would most likely detect interproximal caries (decay) on a mandibular molar? molar bitewing radiograph In which radiograph is the nasal fossa observed? maxillary incisor The paralleling technique of radiographic exposure generally requires distance from the source of radiation to film of 16 inches Which tissue will appear most radiopaque on a radiograph? enamel The lingual foreman and genial tubercle should be able to be observed in which of the following radiographs? mandibular central incisor What size film is generally used in cephalo-metric radiography? 8"x10" In which radiograph is the coronoid process sometimes observed? maxillary molar periapical