Term
| two types of radiation filtration are? |
|
Definition
-inherent (in tubehead passes through the unleaded glass tube, insulating oil, and tubehead seal).
-Added involves what is outside tubehead aluminum disks and lead collimator |
|
|
Term
true/false
every patient should be evaluated individually for dental radiographs. |
|
Definition
|
|
Term
| which is more effective in reducing radiation exposure the 8 inch or the 16 inch PID? |
|
Definition
|
|
Term
| what are the 3 types of PID |
|
Definition
-rectangular
-round
-conical |
|
|
Term
| which shape of PID is most effectivew in reducing patient exposure? |
|
Definition
|
|
Term
| what PID is no longer used due to excess scatter radiation? |
|
Definition
|
|
Term
| do you use thyroid collar for extraoral exposures? |
|
Definition
|
|
Term
| what is the purpose of the filter in the x-ray tubehead? |
|
Definition
| removes low energy x-rays (longer wavelengths) |
|
|
Term
| what are the 3 items that inherent filtration passes through in tubehead? |
|
Definition
-oil
-unleaded glass window
-tubehead seal |
|
|
Term
what is the most effective method of reducing patient exposure of these choices:
a.lead apron
b.fast films
c.round PID
d.film holding device |
|
Definition
|
|
Term
| what is the device that restricts the size and shape of the x-ray beam? |
|
Definition
|
|
Term
| what is a collimator made of? |
|
Definition
|
|
Term
| what is the function of filtration? |
|
Definition
|
|
Term
| what is the recommended size of the beam at the patients face? |
|
Definition
|
|
Term
| what is the term that describes the dose of radiation that the body can endure with little or no chance of injury? |
|
Definition
maximum permissable dose
(mpd) |
|
|
Term
| badges should be worn how? |
|
Definition
| at waist level when exposing x-ray receptors |
|
|
Term
machines operating at 70 kvp or lower requires
_____ mm. aluminum |
|
Definition
|
|
Term
| machines operating above 70 Kvp require____mm. aluminium? |
|
Definition
|
|
Term
| what is the angle the dental radiographer should stand to the primary beam? |
|
Definition
|
|
Term
| what is the formula for the maximum accumulated dose? |
|
Definition
MAD= (n-18) x 5 rems/ year
MAD = (n-18)x 0.05 sv/yr |
|
|
Term
| what is the concept that states radiation should be kept to a minimum? |
|
Definition
alara
as low as reasonably achievable |
|
|
Term
| what is the maximum permissable dose for nonoccupationally exposed persons in rem and sv/yr? |
|
Definition
| 0.1 rem/yr or 0.001 Sv/yr |
|
|
Term
| if you have a higher half value layer, will the beam be higher or lower? |
|
Definition
|
|
Term
| what is something that can be added filtration that can be used to protect a patient? |
|
Definition
|
|
Term
| what is the film speed with best definition? |
|
Definition
|
|
Term
| how far from a tubehead should dental radiographer be when taking exposure? |
|
Definition
|
|
Term
| The non occupational exposed maximum permissable dose is? |
|
Definition
|
|
Term
What is the MPD for occupational exposure?
|
|
Definition
|
|
