RAD 241- Unit 1 2024/2025 with 100% correct answers
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Course
RAD 241- Unit 1
Institution
RAD 241- Unit 1
Fifteen sievert = _____ rem correct answers1500
If images are justified in terms of medical necessity and optimal quality images revealing the presence or absence of disease with minimal radiation exposure is: correct answersdiagnostic efficancy
When the potential risk of an adverse effect is...
If images are justified in terms of medical necessity and optimal quality images revealing the presence or
absence of disease with minimal radiation exposure is: correct answersdiagnostic efficancy
When the potential risk of an adverse effect is greater than the potential benefit is the guideline used to
justify than a radiographic exam can be preformed T/F correct answersFalse
Beta particles are identical to ___ except for their origin correct answershigh speed electrons
NRCP report NO. 160, relfects usage patterns through 2006, radon and thoron account for what
percentage of total collective effective dose of the US population correct answers37%
The process most responsible for the contrast between bone and soft tissue in a diagnostic radiographic
image is: correct answersphotoelectric absorption
An interaction at 20 KeV with an iodine atom results in scattered electron correct answersabsorbed
within a few microns of the site of original interaction
Non SI unit for equivalent dose measurements correct answersrem
Measurement for exposure in air only:q correct answersCoulomb per kilogram (C/Kg)
Material/ detector of occupational radiation in an optically stimulated luminescence (OSL) dosimeter
correct answersAluminum Oxide (AL2O3)
What devices offer NO permenant, legal record of exposure correct answersthermoluminescent
dosimeter (TLD)
, pocket ionization chamber
Production of Bremmstrahlung incident electron correct answersdeflected, resulting energy loss
Alpha particles have a radiation weighting factor numerically equal to: correct answers20
Unit of exposure is described as 100 ergs of energy per gram of irradiated absorber? correct answersrad
Special unit, rad describes: correct answersamount of energy absorbed per micron of biologic tissue
Patient received 2000 mrad during 10 min. fluoro exam, what was dose rate? correct answers0.2 rad/
min.
Sievert (Sv) is unit of EqD correct answersTrue
ALARA philosophy correct answersmaintained because there are no established limits for the amount of
radiation at patients may recieve for individual imaging production
show radiographers & radiologist at their facility has given information and consider reasonable actions
that will reduce patient dose below limits
Patients' bone marrow dose (in mGy) is always less than a patients entrance skin dose (mGy) for specific
x-ray procedure (T/F) correct answersTrue
Amount of energy transferred to electrons by ionizing radiation is the basis of the concept: correct
answersradiation dose
Probability of a Compton interaction is influenced by the "Z" of the material T/F correct answersFalse
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