10 free, exam-style DANB Radiation Health and Safety (RHS) practice questions with answers and explanations. No signup required. Work through them below, then take the full free RHS practice test to study every exam domain.
These 10 free RHS questions are organized by exam domain, so you can see how each part of the DANB Radiation Health and Safety blueprint is tested. Reveal the answer and explanation under each question.
After completing a panoramic exposure, the dental assistant reviews the image and notices the anterior teeth appear unusually narrow and blurry, while the cervical spine is projected over the ramus on both sides. Which positioning error MOST likely caused this result?
Correct answer: B - The patient was positioned too far anterior to the focal trough
A dental assistant takes a mandibular premolar periapical image using the bisecting-angle technique. The processed image shows the roots of the premolars appearing significantly longer than their actual length. Which of the following BEST describes the error and its correction?
Correct answer: B - Elongation caused by insufficient vertical angulation; increase the vertical angle
While mounting a mandibular premolar periapical radiograph, the dental assistant notices a small, well-defined oval radiolucency located at the apex of the mandibular second premolar. The tooth tests vital and the patient reports no pain. This finding MOST likely represents:
Correct answer: B - The mental foramen
A dental assistant exposes a maxillary molar periapical image using a PSP (photostimulable phosphor) plate. When the image appears on the monitor, it displays a faint, reversed pattern resembling tire tracks or a herringbone texture overlying the entire image. The MOST likely cause of this finding is:
Correct answer: B - The PSP plate was placed with the back surface facing the x-ray beam
A patient who is moving to another state asks the dental office to mail the original dental radiographs - not copies - to her new dentist. Under HIPAA and standard dental records law, which response by the dental assistant is MOST appropriate?
Correct answer: B - Provide copies of the radiographs and retain the originals, as the records are the property of the dental practice
A dental assistant asks her supervisor how much occupational radiation exposure is considered the maximum permissible dose (MPD) per year. Which of the following is the correct annual MPD for an occupational radiation worker in a dental setting?
Correct answer: C - 50 mSv (5 rem)
Of the following radiation protection measures routinely used in dental radiography, which provides the GREATEST reduction in the area of patient tissue exposed to the primary x-ray beam?
Correct answer: C - Switching from a round PID to a rectangular PID
According to the Law of Bergonié and Tribondeau, which of the following patient populations would be considered MOST sensitive to the biological effects of ionizing radiation?
Correct answer: C - A 9-year-old child in mixed dentition
A dental assistant is preparing for a series of periapical radiographs. The XCP (extension cone paralleling) instrument ring and bite block have been removed from sterilization pouches. The PSP plates are ready. According to the Spaulding classification and current ADA/CDC infection prevention guidelines, how should the PSP plates be handled before placing them in the patient's mouth?
Correct answer: C - Place each PSP plate inside a disposable plastic barrier envelope before use
After completing a full set of bitewing radiographs, a dental assistant is ready to remove personal protective equipment (PPE). She is wearing gloves, protective eyewear, a surgical mask, and a gown. According to CDC guidelines, what is the correct order for removing these items?
Correct answer: B - Gloves → Gown → Eyewear → Mask
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