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|  DOE-HDBK-1109-97
Radiological Safety Training for Radiation-Producing (X-Ray) Devices
Instructor=s Guide
Lesson Plan
Instructor=s Notes
Exposure rates adjacent to a cabinet X-ray
system shall not exceed 2 mrem/hour.
(Add facility-specific examples.)
iii.
Exempt Shielded Installation.
An exempt shielded facility or installation
is similar to a cabinet X-ray installation. It
provides a high degree of inherent safety
because the protection depends on passive
shielding and not on compliance with
procedures. This type does not require
restrictions in occupancy since passive
shielding is sufficient. The low allowable
dose equivalent rate of 0.5 mrem in any 1
hour at 5 cm from the accessible surface of
the enclosure for this class of installation
necessitates a high degree of installed
shielding surrounding the X-ray device.
(Add facility-specific examples.)
iv.
Shielded Installation.
A shielded installation has less shielding
than exempt shielded. This is a cost
advantage for fixed installations,
particularly for high-energy sources where
the reduction in shielding may result in
significant savings. However, there is more
reliance on protective measures such as
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