Exposure timers
Quiz yourself by guessing what should be in
each of the black rectangles below before clicking
on it to display the answer.
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| Using AEC, a 50 speed is mistakenly used instead of a 400 speed IR. What will occur? |
insuffient optical density |
| the use of an impulse or synchronous timer in a single phase will permit exposure times as short as |
17 ms (1/60) |
| timer circuits are located in the _________ circuits for safety reasons |
primary |
| what is the likely cause of an excessively long AEC exposure? |
failure to properly center the x-ray tube |
| thsi terminates an AEC exposure |
Thyristor |
| most common type of device in a modern 3 phase timer circuit is a silicon controlled rectifier. what is the smallest exposure that it is capble of? |
1 millisecond (.001) |
| where are the ioniztion type sensors located? |
between the table and the grid in the bucky tray |
| For AEC, falure to utilize the proper factors will result in |
a radiograph possessing excessive or insufficient optical density |
| a minus 2 setting in the density control setting is the equivalent of how much of a reduction in the mAs value? |
50% |
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