Radiation Protection Chapter 5 with Complete Solutions 2023

Radiation Protection Chapter 5 with Complete Solutions 2023 Position indicating device *ANS* Extension of the x-ray tubehead; is used to direct the x-ray beam Collimation *ANS* Used to restrict size and shape of x-ray beam and to reduce patient exposure MPD *ANS* Maximum doe equivalent that a body is permitted to receive in a specific period of time Beam alignment *ANS* A device that helps to stabilize the receptor position in the mouth and reduces the receptor position in the mouth and reduces the chances of movement Lead apron *ANS* A flexible shield placed over the patient's chest and lap to protect the reproductive and blood forming tissues from scatter radiation Inherent *ANS* Type of filtration in the x-ray tubehead that includes the glass window of the x-ray tube, the insulating oil, and tubehead seal Added *ANS* Type of filtration that consists of aluminum disks placed in the path of the x-ray beam between collimator and tubehead seal Thyroid collar *ANS* Flexible lead shield that is placed securely around patient's neck to protect thyroid gland from scatter radiation State the purpose of the Aluminum disk *ANS* Aluminum disks are placed in the path of the beam to filter out the low-energy, longer wavelength x-rays that are harmful to the patient State the purpose of the lead collimator *ANS* The lead collimator restricts the size and shape of the x-ray mean and to reduce patient exposure Federal regulations require that the diameter of a collimated x-ray beam be restricted to _____ inches at the patient's skin *ANS* 2.75 The dental radiographer should stand at least ___ feet from the x-ray tubehead *ANS* 6 The dental radiographer should stand perpendicular to the beam at a _____ degree to ____ degree angle to the beam *ANS* 135 90 State the MPD for occupationally exposed persons *ANS* 50 mSv/year State the MPD for nonoccupationally exposed persons *ANS* 1 mSv/year Cumulative occupational dose *ANS* Occupationally exposed workers must not exceed an accumulated lifetime radiation dose ( workers age X 10mSv) List the cumulative occupational dose for a person who is 35 years old *ANS* 35 X 10mSv = 350 mSv ALARA *ANS* As Low As Reasonably Achievable states that all exposure to radiation must be kept to a minimum for both patient and operator safety What is the importance of using a lead apron and thyroid collar? *ANS* The thyroid collar protects the thyroid gland from scatter radiation and the lead apron protects the reproductive and blood forming tissue from scatter radiation. True or False: Every patient should be evaluated individually prior to prescribing dental images? *ANS* True true or False: the 8 - inch PID is more effective than the 16 - inch PID in reducing radiation exposure of the patient? *ANS* False True or False: Pointed cones should not be used because of increased scatter radiation? *ANS* True True or False: The thyroid collar must be worn for both intraoral and extraoral exposures? *ANS* False True or False: If necessary, the dental radiographer may hold a receptor in the patient's mouth to ensure a diagnostic image? *ANS* False Describe the function of a filter in a dental x-ray tubehead? *ANS* It removes the size and shape of the beam Which is not a component of inherent filtration? oil unleaded glass window a leaded PID tubehead seal *ANS* a leaded PID Which is the most effective method of reducing patient exposure to radiation? *ANS* fast film Which PID is most effective in reducing patient exposure? *ANS* rectangular Which device restricts the size and shape of the x-ray beam? *ANS* collimator Which material is used as a collimator? *ANS* lead Describe the function of filtration? *ANS* reduces low energy waves What is the recommended size of the beam at the patient's face? *ANS* 2.75 inches Which term describes the dose of radiation that the body can endure with little or no chance of injury? *ANS* Maximum permissible dose Which statement is true of a radiation monitoring badge? *ANS* it should be worn at waist level when exposing x-ray receptors 1. Machines operating at 70kV or lower require ___ mm aluminum 2. Machines operating above 70 kV require ____ mm aluminum *ANS* 1. 1.5 2. 2.5 State the angle at which the dental radiographer should stand in relationship to the primary beam ______ *ANS* 90 - 135 degrees State the maximum permissible dose for occupational exposed persons: ______mSv/year (______ rem/year) *ANS* 0.01 mSv/year 0.1 rem/year