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