
When | the shutter is closed the generator | will | switch off, unless | another shutter | is | still | open in one | of the | ||||
other | tube shield positions. Alternatively. the generator can be | switched | off | manually | by | operating | the | |||||
GENERATOR 0 | the generator is switched off the power | |||||||||||
to the | mA control to minimum, and then the | kV control. | ||||||||||
Any | generation of HT will be inhibited if | the | shutter does | not | fully close | after | a close | shutter | command. |
Fig. 3.1. Opening the window shutter.
3.3.SHUTTER CONTROL
For camera work it is usual to control the exposure time of the film to
timers can be fitted: the
other timer the shutter of window 3 | or | 4. This | paragraph | describes | the | automatic | and manual | control | of the | ||||
shutter operation. |
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When the camera | is | installed | on its | bracket in front of the required | exit | window | of | the tube shield, open the | |||||
shutter disc and push the camera forward until the collimator enters | the | hole in | the | disc. Ensure | that | the | |||||||
microswitch button | on | the tube | shield | is | actuated | by the pin | or arm | of the camera. |
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NOTE: The space between the front of the collimator and the exit opening of the tube shield should be kept as small as possible to ensure that radiation does not escape. Take care that the filter disc is free
to move, and is not damaged.