Part I:
Medical Radiographic Installations
I-l. Introduction
Pages 19-21 contain a checklist of the physical
parameters to be evaluated and the information pertinent
to the
radiation
protection survey of radiographic
instal-lations. The record
keeping
information
identified in the checklist normally has practical value
in identifying the radiographic unit under evaluation.
If information concerning the certification status of the
unit or warning labels affixed to the control panel,
etc.,
is desired, additional space should be provided on
the form developed by the radiologic physicist.
I-2. System Information
Items A-D of Part I-2 of the checklist are "record
keeping' items to identify the survey of a specific room
in an institution and the date the survey is conducted.
The generator/control manufacturer, model type or number,
and serial number should be recorded.
The model type may
be needed to verify technical specifications of the unit, such as
(a) Single phase or three phase,
(b) Falling load and/or constant load,
(c) Minimum switching time, etc.
The maximum tube potential and the maximum tube
current of the generator are useful in setting up a
radiographic technique chart for various examinations as
well as for radiation protection
considerations when
required.
Depending on the
needs of the
hospital, the assumed
specific
"maximum
tube potential and
current" may be the maximum technique factors employed in
the radiographic examination room.
The model numbers
of the x-ray tube insert and
housing allow the identification of
characteristics of the x-ray
thermal
tube.
The serial number of
an x-ray tube is important since x-ray tubes are replaced
upon failure. The radiation output varies from one x-ray
tube to another especially when the comparison is made
between an old and new x-ray tube. The nominal focal
spot sizes identified by the manufacturer, not the actual
measured sizes, should be recorded. Any added filtration
in the x-ray beam designed to be selected by the operator
should be recorded since it
affects
the machine's
exposure rate.
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