Prepare for the DANB Radiation Health and Safety (RHS) exam with these practice questions and answers. This guide covers dental x-ray techniques, radiation protection, image quality, and regulatory compliance.
Q: Professor Wilhelm Roentgena)advocated radiology in the u.sb)exposed the first radiographs in the u.sc)discovered the xrayd)employed the first dental auxiliary in the united states
Answer: c
Q: Digital Radiography Utilizes the following approacha)filmless radiographic computer imaging systemb)electronically charged plated imaging systemc)nonionizing radio frequency imaging systemd) none of the above
Answer: a
Q: a form of energy isa)heatb)lightc)electricityd) x-radiatione) all of the above
Answer: e
Q: Photons are described asa)bundles of energyb) dental film mountsc) electrically neutral particlesd) negatively charged atomic particles
Answer: a
Q: Limited Penetration long wavelength radiation is known asa) short wavelengthsb) hard radiationc) soft radiationd) desirable wavelengths
Answer: c
Q: Background Radiation originates from:a)enviornmentb) outerspacec) radionuclidesd) terrestrail radiatione) all of the above
Answer: e
Q: Ionizing Radiation produces ions whena) radiation passes through the body tissuesb) ions compress into the atmospherec) isotopes flow freely on aird) none of the above
Answer: a
Q: Common Characteristics of radiation area) wavelengths that determine the penetrating power of the energyb) forms of electromagnetic radiationc) the giving off of electrical fields at right angles to the path of traveld) straight lines that travel at 186,000 miles per seconde) all of the above
Answer: e
Q: Hard Radiation is considered to bea) shortwavelengths with great penetrating power. most deseriable and capable of penetrating oral structuresb) long wavelengths with limited penetrating power. unsuitable for exposing radiographs
Answer: a
Q: an electron is defined asa) anything that occupies space and has massb) electrically neutral tiny particlec) center of the atomd) negatively charged atomic particle
Answer: d
Q: Penumbra is defined asa)magnification of an objectb) diverging xraysc) distortion of the shape of an imaged) fuzzy outline of a radiographic image
Answer: d
Q: What are the properties of electromagnectic radiation?a) travels at the speed of lightb) no electrical charge and no mass or weightc) measurable energiesd) a & be) all of the above
Answer: e
Q: Ionizing types of radiation includea) gamma raysb) cosmic raysc) xraysd) only a & be) all of the above
Answer: e
Q: xrays are categorized in the electromagnetic spectrum according to theira)millilitersb)secondsc) litersd) wavelengths
Answer: d
Q: The measurment unit of the number of oscillations per second of electromagnetic radiation is known asa)crestb) wavelengthc) bremsstrahlungd) frequency
Answer: d
Q: Xrays Charasticallya) travel in wavesb) are invisiblec) have no massd) all of the above
Answer: d
Q: a unit measuring ionization in the air is known asa) coulomb per kilogramb) grayc) siervertd) anstorm
Answer: a
Q: A unit measuring the effect of xrays and tissues is defined asa) radb) remc) roentgend) angstrom
Answer: b
Q: Xrays Originate when components in the tube are heated and free electrons are propelled at high speeds toward thea) cathodeb) electrodec) focusing cupd) tungsten target
Answer: d
Q: Dense structures such as bone and enamela) absorb more xraysb) absorb less xraysc) appear radiopaqued) appear radiolucente) a&cf) b&d
Answer: e
Q: Within the xray tube, converted energy producesa)50%heat 50%xraysb) 85%heat 15%xraysc)90%heat 10%xraysd)99%heat 1%xrays
Answer: d
Q: The electrical circuits of the xray machine includea) filament circut (low voltage)b) cathode-anode (high voltage)c) tuning circuitd) all of the abovee) a&b
Answer: e
Q: The electric current flows through the filament circuit and heats thea) tungsten targetb) cathode filamentc) coolidge tubed) focal spote) none of the above
Answer: b
Q: The positive terminal for electrode in an electric circuit is thea) cathodeb) anodec) yoked) timing device
Answer: b
Q: Thermonic emission is created by aa) vaccum within the tubeb) filament wire heated to incandensencec) stream of electronsd) high-voltage current
Answer: b
Q: a tungsten target inset into copper is located in the ____ of the coolidge tubea) dollimatorb) anodec) cathoded) filtere) none of the above
Answer: b
Q: The sharpness of definition of the radiograph is determined by thea)anodeb) cathodec) electric circuitd) focal spot
Answer: d
Q: Within the xray machine the direction of electric current flows from thea) anode to cathodeb) target of the anode to the filament of the wirec) filament of the cathode to the target of the anoded) none of the above
Answer: c
Q: The amperage control determines thea) number of free electrons at the cathode filamentb) speed of electrons toward the targetc) duration of exposured) none of the above
Answer: a
Q: When the amperage is increased of the master control unit the amount of radiation produced willa)decreaseb)increasec) stay the same
Answer: b
Q: The highest voltage to which the current in the tube rises during an exposure is calleda) kvp peakb) millamperagec) millamperage secondsd) none of the above
Answer: a
Q: What Factor must be changed in order to maintain optimum film density when the tungsten target film distance is increaseda) exposure timeb) developing timec) fixing timed) none of the above
Answer: a
Q: When the target film distance is doubled and the film speed and the machine variables remain constant the exposure time will.a) increase by ninefoldb) decrease by ninefoldc) increase by fourfoldd) decrease by fourfold
Answer: c
Q: the total radiation generated during dental radiographic exposure is deterimined bya) MAb) exposure timec) kvpd) millampere seconds
Answer: d
Q: a decrease in the MA will lighten the density of the radiographa) trueb) false
Answer: a
Q: long scale contrast indicate that the density diffrences between areas on the processed radiographs will appear smalla) trueb) false
Answer: a
Q: what diffrences in density will be evident on a processed film that has short film contrasta) few shades of grayb) more shades of grayc) black and white onlyd) non of the above
Answer: a
Q: foreshorting of the film is due to ___ of the PIDa) too much verticle angulationb) too little verticle angulationc) too much horizontal angulationd) too little hortizontal anugulation
Answer: a
Q: Conecutting of the film is the result ofa) central ray not being aimed at the center of the filmb) central ray being aimed at the center of the filmc) film extending more than 1/2 inch above or below the occlusal planed) none of the above
Answer: a
Q: Overlapping is caused by an error ofa) verticle angulationb) verticle positionc) horizontal angulationd) horizontal position
Answer: c
Q: the type of film that shows the entire tooth and its structure around the root apex is thea) bwb) occlusalc) periapicald) panorex
Answer: c
Q: the correct position of the patients occlusal plane during the bisecting technique isa) perpendicular to the floorb) parallel to the midsagital planec) parallel to the floord) none of the above
Answer: c
Q: during the application of the parallel technique the aiming ring of the film holding device should align ___ to the postion indicating devicea) parallelb) angeledc) distantd) opposite
Answer: a
Q: the correcct film position that is required during the paralleing technique isa) 1/2 inch above the occlusal planeb) parallel to the long axis of the toothc) horizontal to the long axis of the toothd) none of the above
Answer: b
Q: an insufficinate amount of verticle angulation will produce an image appearinga)foreshortenedb) elongatedc) overlappedd) herringboned
Answer: b
Q: the advantages of utilizing the parallel technique during exposure of radiographs isa) dimensional distortion is minimizedb) greater accuracyc) improved defination of the imaged) a & be) all of the above
Answer: e
Q: which position indication device is considered to be the most advantageous in the reduction of radiation expisurea) 8 inch pidb) 8 inch open ended pidc) 16 inch open ended coned) rectangular cone
Answer: d
Q: the advantage of increading the target film distance for patient protection is that it serves toa) increase scatter radiationb) reduce film speedc) decrease radiation intensityd) all of the above
Answer: c
Q: The film holding device utilized for the paralleling technique is thea) pt fingerb) hemostatc) snap a rayd) xcp
Answer: d
Q: when the target source film distance is doubled utilizing a 16 inch pid the exposure tim is adjusted bya) multiplying by 8b) multiplying by 6c) miltiplying by 4d) dividing by 2e) dividing by 4
Answer: c
Q: prior to exposing the patient to a bw or fms the mouth is examined fora) abnormal morphologyb) removable paritalsc) variations of the palated) all of the abovee) only a & b
Answer: d
Q: when taking intraoral and panoramic exposures on children the operator shoulda) decrease the exposure timeb) increase the exposure timec) decrease the exposure time in the max regiond) increse the exppsure time in the posterior region
Answer: a
Q: the number of films that comprise an adult full mouth seriesa) 18 to 20b) 10 to 15c) 20 to 25d) 8 to 10
Answer: a
Q: the embossed dot on the film is positioned toward the ___ surface during exposurea) mesialb) buccalc) occlusal/incisald) apical
Answer: c
Q: the pedodontic film survey should include the followinga) smaller film sizeb) shorter exposure timesc) slightly steeper verticle angulationd) only a&be) all of the above
Answer: e
Q: radiographic technique for exposing the edentulous survey requiresa) utilization of cotton rolls, styrofoam blocks, and xcpsb) operator to substitute the alveolar ridge for the long axis of the missing toothc) approx 25% less exposure timed) only a&ce) all of the above
Answer: e
Q: for a rapid survey of large areas of the maxilla and mandible it is best to usea) panoramic filmb) cephalometric filmc) occlusal filmd) interproximal film
Answer: a