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aperture.
Side Plates with Mounting Tabs
On two sides of the aperture cover are the side plates. These are attached with tamper resistant screws
to prevent disassembly. As the source capsule holder is inside, it would pose a potential radiation safety
hazard were these plates removed. Four rectangular stainless steel extend outward from the source
holder assembly. These are sized 1/4 x 5/16 inch (6 x 8 mm) extending out about .75 inch (19 mm)
from the source holder. These are the mounting tabs where the source body is clamped to the head, or
safety cap. Three mounting blocks are used to hold the source holder in place.(One tab is not accessible
in the Modular Head.)
Mechanical Shutter Arm
This arm indicates when the shutter is open or closed. It is also possible to open and close the shutter
manually by this arm. When this arm is in its normal non energized state, the position closest to the
sheet, the shutter is closed. When away from the sheet, the shutter is open. Green and red sheet dots are
on the indicator.
Temperature Measuring Device
Temperature measurement is simplified in Source 12 compared to Sx 6 and Sx 9. Source 12 has five
temperature measurements : Sx column, Sx backplane, Sx air curtain, Rx air curtain, and Rx backplane.
All Source 12 temperatures are measured by a direct readout temperature device. The voltage output of
this device is linear with temperature. Replacing this device requires removing the source body holder,
and working close to the capsule. There is an assembly for easier field replacement, Honeywell part
number 08672000, which contains the temperature device and three wires attached.
Warning. Only those qualified under radiation safety license and getting clearance
from the Honeywell Radiation Safety Department are allowed to replace the
temperature measuring device on the source body assembly
(Source air column measurement).
Fire Safety Pin
The fire safety pin prevents accidental opening of the shutter after a fire. The design is much like
previous fire safety pins. The actual pin has a new part number, but its working principles are the same
as in the earlier version, solder holds a compressed spring. In case of high temperature from a fire, the
solder melts releasing the spring which forces a pin down to close the shutter.
There is a separate maintenance procedure for replacement of the fire safety pin.
Warning. Only those qualified under radiation safety license and getting clearance
from the Honeywell Radiation Safety Department are allowed to replace the fire
safety pin.
Sx 12 Radiation Interlock PCB (054237XX)
The board mounts on the Sx12 source assembly. It provides termination for the ribbon cable to the
backplane as well as providing termination to the solenoids, green light switches and for the source air
column temperature measurement device. Beside the above mentioned functions, the board's primary
function is to provide radiation interlock.
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