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DOE-HDBK-1109-97
Radiological Safety Training for Radiation-Producing (X-Ray) Devices
Student's Guide
ii.
Cabinet X-ray Installation.
A cabinet X-ray installation is similar in principle to the analytical enclosed beam
system. The X-ray tube is installed in an enclosure (cabinet) that contains the
object being irradiated, provides shielding, and excludes individuals from its
interior during X-ray generation. A common example is the X-ray device used to
inspect carry-on baggage at airline terminals. Certified cabinet X-ray systems
comply with the regulations of 21 CFR 1020.40. 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 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 warning lights, posting, and procedures.
However, the posting and access control requirements, of 10 CFR 835 apply. Any
High Radiation Area must be appropriately controlled and any Radiation Area
must be defined and posted.
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