DANB FINAL TEST 2025

The dentist says that the image has too much contrast; she would like to see more gray values. What adjustment would you make? - Correct Ans-Increase kVp. All of the following are true statements about film badges except: a. they should be worn at work only. b. if an assistant follows all safety precautions; exposure should be near zero. c. they should be worn when any form of x-ray is taken. d. the badge is usually worn for 3 to 4 weeks before returning it for reading. - Correct Ans-c. they should be worn when any form of x-ray is taken. Each of the following is true about digitizing film-based radiographic images except: a. it duplicates with slightly less detail than the original film. b. desktop scanners capture the light signal. c. the process is similar to other film duplication. d. digitized film-based images cannot be enhanced by computer software - Correct Ans-d. digitized film-based images cannot be enhanced by computer software The penetrating power of the x-ray beam is controlled by the settings on the: - Correct Ans-kilovoltage setting. All of the following organs are more sensitive to radiation and are considered critical organs except: a. skin. b. thyroid gland. c. muscle. d. lens of the eye. - Correct Ans-c. muscle The maximum permissible dose for an occupational worker for an individual 18 years of age or older is _____ rem/year. - Correct Ans-5 rem/year Which of the following terms is used to describe the energy or penetrating ability of the x-ray beam in dental radiography? a. Quantity b. Quality c. Collimation d. Density - Correct Ans-b. Quality Which of the following is the name for the primary kind of radiation produced in the dental x-ray tubehead? a. Braking radiation b. Characteristic radiation c. Particulate radiation d. Electromagnetic radiation - Correct Ans-a. braking radiation Which of the following statements is true concerning the structure of the atom? a. Electrons have no weight or mass. b. The orbital path of an electron around the nucleus is called an electron shell. c. Electrons are unstable in their orbits and shift freely. d. The nucleus contains protons and electrons. - Correct Ans-b. The orbital path of an electron around the nucleus is called an electron shell. Jimmy wants to know why you want to put the heavy "blanket" (lead apron) on him before taking his "pictures." You explain that: - Correct Ans-"It works to protect him from scatter radiation." The heart of the x-ray generating system is the: - Correct Ans-x-ray tube Positioning instruments in digital radiography: - Correct Ans-Assist in film placement and keep the patient's fingers from being exposed The recommended distance between the safelight and where the films are unwrapped is: - Correct Ans-4 feet Chronic radiation exposure occurs when _____ doses of radiation are received over a _______ time period. - Correct Ans-small, long After the last image is obtained the dental assistiant removes their treamtment golves. After removing gloves, the dental assistant should: - Correct Ans-remove the lead apron from the patient The uses of dental images include the detection of: - Correct Ans-abnormalities in surrounding hard and soft tissues A plastic or metal film cassette holds and protects the extraoral film. During exposure, the side of the cassette must face the patient is the _____ side - Correct Ans-front An example of cumulative radiation exposure is: - Correct Ans-cancer An exposure time of 1/4 second is equal to _____ impulse(s). - Correct Ans-15 Which of the following statements about duplicating film is not correct? a. The emulsion side of the film appears shiny. b. Duplicating film is exposed by visible white light. c. Duplicating film is not intended to be used intraorally. d. The emulsion is only on one side. - Correct Ans-a. The emulsion side of the film appears shiny. Clear spots on a processed film can be caused by: - Correct Ans-fixer contacts film prior to processing Automatic film processing requires _____ than manual film processing does. - Correct Ans-less equipment The sharpness of a radiographic image can be improved by: - Correct Ans-smaller film crystal size According to the current recommendations (2003) of the National Council on Radiation Protection and Measurements, the current MPD for occupationally exposed persons is ___________/year. - Correct Ans-5.0 rem The life of the automatic processer solutions is reduced rather than extended when: - Correct Ans-more time has elapsed since the last complete change of processing solutions. When developer solution in an automatic processor is warmer than 83° F, the processed film will appear: - Correct Ans-dark or black The purpose of the lead foil in the dental film packet is to: - Correct Ans-reduce film fogging. The safest place to store unopened boxes of dental film is in the: - Correct Ans-darkroom The location where x-rays are produced in the x-ray tube is called the: - Correct Ans-focal spot Which of the following time and temperature errors will result in reticulation of the film emulsion? a. Developer solution too hot b. Sudden temperature change between developer and water bath c. Inaccurate timer or thermometer d.Inadequate development time - Correct Ans-b. Sudden temperature change between developer and water bath During your FMX your patient asks "If the x-rays aren't dangerous, then why do you leave the room when x-rays are used?" You smile and tell him that: - Correct Ans-the effect of radiation exposure is cumulative and following appropriate protection for both us is following good radiation safety. When film emulsion interacts with x-rays, the result is: - Correct Ans-a latent image The x-ray was discovered in 1895 by: - Correct Ans-Wilhelm Conrad Roentgen The fuzzy or blurred area around an ima