Specifications

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3BUS 208 000 R130116 Radiological Safety
Safety Features
The radioactive material used in the nucleonic sensors is hermetically sealed in a
high integrity metal capsule to form a sealed source. Each sealed source is
manufactured to exacting specifications and is subjected to rigorous quality control
procedures.
The sealed source in the nucleonic sensor and the X–ray tube in the X–ray sensor
are shielded because they are encased in metallic source holders and are equipped
with spring–loaded, fail–safe shutter mechanisms. The shutters are designed to
remain closed except during operation. During operation, the system applies power
to overcome the spring of the shutter mechanisms. The shutters close automatically
if power to the Scanning Platform is turned off or interrupted.
When power is applied, the status of the shutters (open or closed) is indicated by
the red and green shutter lights on the Scanning Platform. A red light means one
or more shutters are open and there may be a radiation beam in the measuring gap.
A green light, at the control panel on the end column, means all the shutters are
fully closed. Refer to Figure 2-1 on page 17 for a representation of the combined
shutter and status lights on the end column. The shutter status lights for each
individual shutter mechanism are located on the lower head carriage. Refer to Figure
2-1 for the locations of the shutter status lights. The Ash High–Voltage status light
(yellow) indicates that the X–ray tube is energized when the light is illuminated.