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Radiation Measures

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Radiation Measurement Quiz
Answer
Gray   Absorbed dose  
Sievert   Dose equivalent (replaces REM)  
REM   Dose equivalent (occupational exposure)  
Curie   Original unit of radioactivity.  
Becquerel   Unit of radioactive decay  
Roentgen   Unit of exposure dose in air of x-rays.  
Rad   Absorbed dose (Patient Dose)  
A.L.A.R.A.   As Low As Reasonably Achievable  
The 3 Cardinal Rules of Rad Protection are:   Time, Distance and Shielding  
What are 3 Radiation sources?   Natural (cosmic rays, terrestrial), Industrial (Nuclear fuel, cosumer products) and Medical (x-rays, nuclear treatment)  
Distortion   Misrepresentation of size or shape of any anatomic structure  
Recorded detail   Ability to visualize small structures  
Contrast   Difference in density between any two areas on a radiograph  
Density   Degree of film blackening  
kVp   Primary controlling factor of radiographic contrast.  
kVp Formula:   cm (x) 2 + 40 = kVp  
What 3 factors control quality of radiographs?   mA, kVp and exposure time  
Reduce exposure for these conditions   Old age, Pneumothorax, Emphysema, Emaciation, Atrophy  
Increase exposure for these conditions   Pneumonia, Enlarged heart, Edema, Pleural effusion  
Source to Image Receptor Distance   Distance from anode inside x-ray tube to the image receptor.  
SID affects:   Magnification of body part, recorded detail, patient dose  
What are the 4 factors of radiographic quality?   Contrast, Density, Detail and Distortion  
The quantity of x-rays is dependent upon what?   mAs  
What unit is used to measure the quantity of radiation received by rad workers?   Rem  
How are milliamperage and time related to each other when used to maintain density?   Inversely proportional  
Which one of these factors (kVp, mAs) control radiographic DENSITY?   mAs  
Which one of these factors control radiographic CONTRAST?   kVp  
What does the rad and gray have in common?   They both measure absorbed dose.  
What does the Sievert and the Rem have in common?   They both measure the dose equivalent (occupational exposure)  
What is the kVp for a part that measures 8cm thick?   56 kVp (8cm x 2 + 40)  


   





 
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Created by: rad1958tech on 2007-07-15



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