SIGMA 150Ci - Manual (Page 66)

6.1
DEFINITIONS AND TERMS
Area alarm
An area radiation level monitor that provides a highly visual warning when the radiation
level exceeds a pre-set threshold. Commonly referred to as Gammalarms, use is required by
most jurisdictions in permanent radiographic installations and they are often used in
conjunction with door interlocks and audible alarms. Portable area alarms are required by
some jurisdictions for radiography performed at temporary job-sites.
Alarm ratemeter
An alarm worn by radiography personnel that provides a continuous audible warning
when the alarm ratemeter detects a radiation level in excess of a pre-set threshold of
500mR/hr (5mSv/hr). This redundant safety alarm is required by regulation for temporary
job-site radiography within the USA.
Apparatus for industrial gamma radiography
Apparatus including an exposure device, a source assembly as applicable, a remote control,
a projection sheath, an exposure head and accessories designed to enable radiation emitted
by a sealed radioactive source to be used for industrial gamma radiography purposes.
Also known as: isotope radiography system, isotope radiography kit.
Automatic securing mechanism
An automatically activated mechanism located on the radiographic exposure device
designed to restrict the source assembly in the secured position.
Beam limiter
A shielding device for confining the elements of a beam of radiation to an assigned
solid angle. Beam limiters are generally manufactured from lead, tungsten and
depleted Uranium and are pre-positioned over/on the radiation source's working position.
Also known as: collimators.
Control crank
A control cable cranking device that is a component of the remote controls. The control
crank is used at a distance by the radiography personnel to move the radiation source to
and from the device, through projection sheaths to and from the exposure position.
Manual control crank mechanisms are commonly used, but automatic exposure controllers
are available which can be operated from a greater distance and allows preset timing and
automatic expose and retract modes. Also known as: wind-outs, crank-outs, hand-cranks.
Control cable
A cable or other mechanical means used to project and retract the source assembly out from
and into the radiographic exposure device by means of remote control. The control cable
includes the means of attachment to the source holder. Also known as: remote control
cable, drive cable, Teleflex™.
Control cable sheath
Rigid or flexible tube for guiding the control cable from the remote to the radiographic
exposure device and providing physical protection to the control cable. The control cable
sheath includes the necessary connections for attachment to the radiographic exposure
device and to the remote control. Also known as: control cable housing, conduit.