PTW/Specific/TBT-PTW-015

Radiographic Testing Permits

Permit to Work › Specific › Radiographic Testing Permits

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Radiographic testing (RT) uses X-rays or gamma radiation to inspect welds, castings, and structural connections.
Ionising radiation is invisible, odourless, and can cause cancer, radiation burns, and death at high doses.
A specific radiography permit to work is required before any RT activity takes place on a construction site.
The Ionising Radiations Regulations 2017 (IRR17) set the legal framework for all radiographic testing in the UK.
Exclusion zones (controlled areas) must be established and guarded to prevent anyone entering during exposure.
Only classified radiation workers with appropriate dosimetry and training may carry out radiographic testing.
Gamma sources such as Iridium-192 and Cobalt-60 remain radioactive permanently and are extremely dangerous if mishandled.
Night-time radiography is common on construction sites to minimise disruption and reduce the number of exposed persons.
Radiation warning signs, barrier tape, and audible alarms must be in place before any source is exposed.
The Radiation Protection Adviser (RPA) and Radiation Protection Supervisor (RPS) have specific legal duties during RT.

Prevent radiation exposure	Uncontrolled exposure to ionising radiation causes cancer, tissue damage, and can be fatal at high doses.
Legal requirement	IRR17 requires radiographic testing to be carried out under strict permit controls with exclusion zones.
Protect all site workers	Radiation passes through walls and structures — exclusion zones must be large enough to protect everyone nearby.

Don't

Obtain a specific radiography permit to work before any RT activity begins on site
Establish controlled area exclusion zones at the distances calculated by the RPS
Post radiation warning signs and barrier tape at all access points to the exclusion zone
Ensure only classified radiation workers with valid dosimetry carry out the RT exposure
Brief all site workers on the timing, location, and exclusion zone before RT takes place
Monitor radiation levels at the exclusion zone boundary during every exposure sequence
Confirm all personnel are clear of the exclusion zone before the source is exposed
Use audible warning signals before, during, and after each radiation exposure sequence
Secure the radiation source in its shielded container immediately after testing is complete
Record all exposure times, source details, and permit information in the radiation log

DON'T allow anyone to enter the exclusion zone while the radiation source is exposed
DON'T carry out radiographic testing without a valid, signed radiography permit to work
DON'T handle radiation sources without classification as a radiation worker and valid dosimetry
DON'T remove barrier tape, warning signs, or exclusion zone markings during RT operations
DON'T assume walls or structures provide adequate shielding without the RPS confirming distances
DON'T leave a radiation source unattended or unsecured outside its shielded container
DON'T carry out RT during busy site periods when many workers are nearby unless fully controlled
DON'T ignore your dosimeter reading — report any unusual exposure to the RPS immediately
DON'T transport radiation sources on site without following the approved safe handling procedure
DON'T dispose of or attempt to repair damaged radiation sources — contact the specialist provider

See also: Permit to Work Awareness | Weld Inspection and NDT Safety

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