SIGMA projetor - Manual (Page 12)

OPERATING INSTRUCTIONS
2.1
Job site safety precautions
Instruments
The radiographer and radiography assistants must at all times wear a film badge or TLD and pocket
dosimeter with a range of 0-2 mSv (0-200 mRem). 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
20 µSv/hr (2 mR/hr) up to 10 mSv/hr (1,000 mR/hr). Canadian regulations require that survey meters
used for industrial radiography be capable of measuring from 2 µSv/hr (0.2 mR/hr) and up to 100 mSv/hr
(10 R/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 that 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 (beam limiter) 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
Only trained and qualified radiographers or assistants working under their direct supervision may operate
radiography systems. 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.