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Radiation Measures

Radiation Measurement QuizAnswer
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)
Created by: rad1958tech on 2007-07-15



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