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2.1
OPERATING INSTRUCTIONS
QCP385 issue 2
Job site safety precautions
Instruments
The radiographer and his assistant must at all times wear a film badge or TLD and pocket
dosimeter with a range of 0-200mRem (0-2mSv). Regulatory requirements in the USA also
require that an audible alarm ratemeter be worn at temporary jobsites. Specifically, those
locations that are not permanent radiographic installations equipped with functional door
interlocks and audible/visual alarms.
Radiographers in the USA must also have a survey meter capable of measuring in the range
2mR/hr (20µSv/hr) up to 1,000mR/hr (10mSv/hr). Canadian regulations require that survey
meters used for industrial radiography be capable of measuring from 2µSv/hr (0.2mR/hr)
and up to 100mSv/hr (10R/hr). In any regulatory jurisdiction, always verify survey meter
requirements affecting the range and calibration requirements prior to engaging in
industrial radiography operations.
An audible ‘chirper’ pocket alarm may be required in some countries.
Restricted Area
Radiography must be performed only in a restricted area which is marked with the
appropriate radiation warning signs and secured against unauthorized entrance.
Distance
Since the source emits high levels of radiation it is good practice to operate the system from
as great a distance as possible.
Shielding
Whenever possible, situate the radiographic exposure area in a room with suitably thick
walls, floor, ceiling and doors. Whenever possible, the use of a collimator provides effective
shielding to reduce radiation levels outside of the central beam. It is recommended that
collimators be used at temporary job sites to minimize occupational exposure to radiation.
Surveillance
Radiography systems must be operated only by trained and qualified radiographers or
assistants working under their direct supervision. The radiographer must be physically
present at the site and able to control and limit access to the restricted area.
Locking
Keep the exposure device locked while assembling the system and when not being used to
perform radiography. Locked is defined as the exposure device's lock is fully engaged with
the key removed. Store the key in a secured location.