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Sealed Source
Radioactive source sealed in a capsule or having a bonded cover, the capsule or cover being strong enough to prevent contact
with and dispersion of the radioactive material under the conditions of use and wear for which it was designed. Commonly
referred to as: the ‘source’ or the ‘pill’.
Secured Position (shielded position)
Condition of the radiographic exposure device and source assembly, when the sealed source is fully shielded and restricted to
this position within the radiographic exposure device.
Note: When in the secured position during radiographic operations, the radiographic exposure device may be
unlocked.
Simulated Source
A sealed source whose structure is such as that of the sealed radioactive source, but not containing any radioactive material.
Also known as: mock source, dummy source, phantom source, dummy pill.
Source Assembly
A source holder with a sealed source attached or included. In cases where the sealed source is directly attached to the control
cable without the use of a source holder, the source assembly is the control cable with the sealed source attached. In cases
where the sealed source is not attached to the control cable nor included within the source holder, the sealed source is the
source assembly.
In the case where a simulated source is attached to or included with a source holder or control cable, this becomes a simulated
source assembly.
Flexible type source assemblies are also known as ‘pigtails’. The source assembly is most commonly referred to as the
‘source’.
Rigid or chain link type source assemblies are also known as: source rods, source pencils, source trains, source chains.
Source Holder
A holder or attachment device, by means of which a sealed source or simulated source
can be:
directly included in the radiographic exposure device (category I apparatus - an exposure device in which the source
assembly is not removed for exposure).
fitted at the end of the control cable (category II apparatus - an exposure device from which the source assembly is
projected out through a projection sheath to the exposure head for exposure. The exposure is remotely operated.)
Source holders may be an integral part of the source assembly or may be capable of being dismantled for sealed source
replacement.
Source Changers
A lockable Type A or Type B(U) transport container used to transport new sealed source assemblies, exchange them and
return depleted sealed source assemblies to the manufacturer. Source changers are also utilized for storage of sealed source
assemblies. Also known as: source exchangers, storage containers.
Working Position
Condition of the exposure container and source assembly when in the position intended for the performance of industrial
gamma radiography.
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