8/19/2019 RT quiz 2

http://slidepdf.com/reader/full/rt-quiz-2 1/5

RT – LEVEL II (QUIZ)

1. Which of the following is an advantage of using an x-ray machine rather than agamma ray source?A. Greater penetrating powergreater portabilityc. Radiographs will have greater latitudeability to control the radiation energy and the intensitye. an use shorter !"#$s because of smaller target source si%e

&. As photons interact with the atomic structure of the specimen' ioni%ation ta(esplace and as a result of the ompton )*ect' secondary photons are generated thatare referred to as+a. absorptionb. !oft radiationc. scatter radiatione. ,remsstrahlung

. -rays are generated in a x-ray tube when electrons traveling at high velocity

collide with the atoms of the target material. /ost of the electrons energy isconverted to+a. ontinuous x-raysb. haracteristic x-raysc. 0eatd. ong wavelength x-rayse. 2isible ight

3. When the intensity of x-radiation will be higha. distance between the source and ob4ect as small as practicalb. 5he tube current should be decreasedc. 5he test specimen should be moved further from the 6lm

d. A lower (ilovoltage should be applied to the tubee. 5he large focal spot should be used

7. Radiation energy is usually expressed in terms of+a. 8ev or /evb. uries per gramc. Roentgens per hourd. /illiroentgens per houre. ,oth 9 #

:. What is the primary di*erence between x-rays and gamma rays of the sameenergy?

a. Wavelengthb. "re;uencyc. 2elocityd. <rigine. =ntensity

>. When all of a photon$s energy is absorbed as it collides with an electron andpositron in an atom in the test specimen' the ioni%ation process involved is called+a. hotoelectric )*ect

1 | a g e

8/19/2019 RT quiz 2

http://slidepdf.com/reader/full/rt-quiz-2 2/5

RT – LEVEL II (QUIZ)

b. ompton )*ectc. air roductiond. 5otal Absorptione. artial Absorption

@. 5he speed at which and gamma rays travel is+a. 5he speed of lightb. 5he speed of soundc. =t varies with the wavelengthd. =s dependent upon the type of the sourcee. =s dependent upon the energy level

. What is the primary di*erence between x-rays of di*erent energies?a. Wavelengthb. "re;uencyc. 2elocityd. =ntensity

1B. What governs the penetrating power of an x-ray beam?a. 8ilovoltageb. timec. activityd. milliamperagee. focal spot si%e

11. 5he shorter the wavelength of x or gamma rays+a. 5he lower their energyb. 5he faster they travelc. 5he greater their penetration power

d. the slower they travel

1&. As the (ilovoltage applied to the x-ray tube is lowered+a. xrays of longer wavelength and more penetrating power are producedb.xrays of shorter wavelength and more penetrating power are producedc.xrays of shorter wavelength and less penetrating power are producedd.xrays of longer wavelength and less penetrating power are producede. none of the above are correct

1. 5he half-life of an isotope is+a. referred to as #C7Bb. its average life after passing through a half-value layer

c. half of its total lifed. the time re;uired for the original activity to decrease to one-half e. the time re;uired for the source to be reduced to one-half its original si%e

13. 5he intensity of x-radiation in air is usually measured in+a. Roentgensb. )rgsc. 09# unitsd. uries

2 | a g e

8/19/2019 RT quiz 2

http://slidepdf.com/reader/full/rt-quiz-2 3/5

RT – LEVEL II (QUIZ)

17. =f it was necessary to radiograph a >D thic( steel product' which of the followingradiation sources would most li(ely be used?a. cobalt-:Bb. BB 8v x-raysc. =ridium-1&d. :BB 8v x-rayse. Radium

1:. 5he urie is a measure of the EEEEEEEE of a radioactive source.a. si%eb. activityc. weightd. speci6c weighte. protons and neutrons

1>. Gamma radiation+

a. =s visibleb. ioni%es matterc. 0as an odord. =s hot to the touche. !mells li(e acetylene gas or rotten eggs

1@. =oni%ation refers to+a. slowing down of electrons production x-radiationb. Any action that results in change in the electrical balance of the atomc. !catterd. hoton or bundle of electromagnetic energye. 0ow fast the electrons are moving

1. 5he velocity of electrons stri(ing the target in an x-ray tube is a function of+a. 5he atomic number of the cathode materialb. 5he atomic number of the 6lament materialc. the current Fow in the recti6er circuitd. 5he atomic weight of the photon stri(ing the targete. 5he voltage di*erence between the cathode and anode

&B. Which of the following is an advantage to the radiographer of using a gammaray source rather than an x-ray machine?a. Radiographs generally have less contrast' but greater latitudeb. Greater portability

c. Radiographs will generally have greater contrast' but less latituded. 5he ability to control radiation energy and intensitye. the gamma ray sources are easily replaced.

3 | a g e

8/19/2019 RT quiz 2

http://slidepdf.com/reader/full/rt-quiz-2 4/5

RT – LEVEL II (QUIZ)

&1. ontrast is de6ned as the comparison between EEEEEEEEEEEEEEE on di*erent areas ofthe radiograph+aH #ensity

bH !ensitivitycH !harpnessdH atitude

&&. #e6nition is de6ned as the measure of the EEEEEEEEEEEEEEE of the outline of the image in theradiograph.aH #ensitybH !ensitivitycH !harpnessdH atitude

&. !catter radiation+

aH =s not controllable

bH =s controllable to some extent' but cannot be completelyeliminated

cH an be eliminated completely by changing the (2

dH an be eliminated completely by using lead intensifyingscreens

&3. !low 6lms+

aH Give better de6nition than fast 6lmsbH Are faster than fast 6lms

cH Re;uire shorter exposure times than fast 6lmsdH Isually have less contrast than fast 6lms

&7. Good radiography is produce in 3 min. at : mA. What

exposure time is re;uired if the mA is half?

AH 1.B min.

,H @.B min.H .B min.

#H 1B.7 min.

&:. 5he distance level at one meter from gamma source is37B mRCh. what is the distance re;uired to reduce the

radition level to & mRChAH 7 meter,H > /eter

H 1B /eter

#H 17 meter

4 | a g e

8/19/2019 RT quiz 2

http://slidepdf.com/reader/full/rt-quiz-2 5/5

RT – LEVEL II (QUIZ)

5 | a g e