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RAD 100
Ch 7- 9
| Term | Definition |
|---|---|
| Classic Coherent Scattering | Energies below 1000 keV or 10 eV |
| Photo electric effect | diagnostic 10eV- 100/150eV energy range |
| what are the biproducts of Compton Scattering | losing the outer shell e- as a recoil e- & a scattered photon |
| what are the biproducts of Pair Production aka partial annihilation? | Two particles- positron & negatron each have .51 energy (1.02 MeV combined). |
| Photodisintegration | radiation oncology, minimum of 10 MeV |
| Coulombs per kilogram (C/Kg) | 2.58 x 10^-4, Roentgen (exposure in air) |
| Gray (Gy) | 1= 100 rad (radiation absorbed dose) |
| Sievert (Sv) | 1= 100 rem(Radiation equivalent Man ) |
| Air Kerma “kinetic energy released in matter” | joules per kilogram (J/kg) |
| Becquerel (Bq) | 3.7 x10^10=1 Ci (curie), 1= 1 disintegration per second (dps) |
| annual whole-body effective dose limit for the occupational worker: | 50 mSy (5 rem) |
| Two types of interactions that are important in diagnostic radiography | photoelectric interactions & Compton scattering |
| what are the biproducts of the photo electric effect? | photoelectron & characteristic radiation/cascade effect |
| how much energy does pair production require? | very large energy incoming photons of at least 1.02 MeV of energy |
| 1 Sv equals how many rem? | 100 |
| what is the unit used to measure the amount of energy absorbed in any medium? | gray |
| The interaction of x-rays with matter that constitutes the greatest hazard to patients in diagnostic radiography is | photoelectric interaction |
| True digital image receptors are referred to as | FPD |
| what is NOT a radiographic contrast medium | water |
| spatial resolution/detail | FSS |
| if you increase the kVp by 15%, you _____ the receptor exposure | double |
| what is the purpose of lead housing | to absorb e- & prevent escape |
| what is the purpose of the glass tube? | to absorb heat |
| what is the purpose of filtration? | to remove low energy wavelengths to decrease pt dose, specifically on the skin |
| what is the purpose of the collimator? | to restrict the primary beam using lead, reducing the field |
| to increase spatial resolution: | long SID short OID sm FSS |
| All of the following are factors influencing the amount of receptor exposure EXCEPT: kVp MAs FSS SID | except FSS |
| ___ materials allow x-ray photons to pass through comparatively easily, resulting in little beam attenuation | radiolucent |
| The x-radiation that is “left-over” and exits the patient to strike the image receptor and create the image is known as ___ radiation | exit/remnant |
| Imaging using film/screen technology has been almost entirely replaced by (multiple answer) - direct and indirect digital technology -polaroid stimulated systems - digital radiography (DR) systems - computed radiography (CR) | direct and indirect digital technology, digital radiography (DR) systems, computed radiography (CR) |
| According to the law of Bergonie and Tribondeau, the characteristics that determine the sensitivity of a cell to radiation are: | mitotic activity & structure/ function of the cell |
Created by:
taetay5831