An Australian crew first identifies the state, territory or Commonwealth authorisation and the adopted radiography requirements. Radiographic testing and gas drying contain different invisible hazards. Establish the radiation source state and controlled-area release independently from gas isolation, pressure verification and atmosphere controls. Neither completed weld imaging nor a silent dosimeter authorises the next operation.
Measured radiation boundary, source accountability and gas-energy control
This is reference content written and revised with AI. It has not been verified or approved by a professional. Review by a suitably qualified professional and site authorisation are required before use.
Stop work
Stop for a missing observer, failed survey meter, dose alarm, unauthorised entry, changed exposure geometry or uncertain source retraction. Separately stop drying for an unstable line, abnormal pressure, blocked outlet or failed atmosphere control.
1. Legal and technical scope
| Basis | Application limits |
|---|---|
| ARPANSA RPS C-4 | Official code landing page, scope and adoption/authorisation explanation reviewed; draft PDF not used as current law. |
| ARPANSA industrial radiography workers | Official worker guidance on training, equipment and controlled-area failures. |
| IAEA SSG-11 | International technical guidance; geometry, access control and surveys. |
| HSE GS4 | Foreign pressure-work technical reference, not Australian legislation. |
In Australia determine the actual Commonwealth, state or territory radiation regulator and authorisation. ARPANSA RPS C-4 provides industrial-radiography requirements that regulators may refer to in authorisations. An ARPANSA publication does not by itself establish which licence covers this particular site.
The official RPS C-4 page was reviewed; it distinguishes the 2018 code from the superseded RHS31 and from non-mandatory IAEA guidance. The original OSHA/NRC legal framing and universal 10 µSv/h boundary were removed. Site licence conditions and the full locally adopted rule set remain to be checked.
2. Scope and required inputs
Included scope
Planning site RT, safe access, instrument and equipment checks, supervised exposure, measured confirmation of the safe source state, followed by separately authorised preparation and controlled gas drying.
Separate review
Source recovery, repair of exposure devices, source exchange, entry into oxygen-deficient spaces and pneumatic strength testing require separate specialist arrangements. Gamma sources continue to emit when equipment power is off; X-ray equipment has a different shutdown and electrical-isolation method.
| Required input | What to verify |
|---|---|
| Plan and coordinate | Licence and local rules · Source or generator identity · Access and occupancy plan · Named radiation lead |
| Access and equipment | Platform and rescue plan · Component identification · Dosimetry and calibration · Communication test |
| Set RT boundary | Boundary and occupancy map · Survey points and readings · Warnings and observers · Authorised exposure conditions |
| Prove source safe | Source-safe survey record · Instrument function · Device lock and inventory · Radiation lead release |
| Prepare gas drying | Gas identity and flow plan · Rated temporary assembly · Relief and restraint design · Ventilation and gas assessment |
| Vent and hand over | Pressure verification method · Drain and vent locations · Radiation source accounted for · Recorded handover and defects |
No fixed distance or single generic dose-rate number establishes every RT boundary. The radiation lead applies the actual regulator, licence, local rules, source strength, exposure geometry, occupancy and measured conditions. Drying pressure, gas flow, relief capacity and vent design must suit the complete temporary assembly.
Radiation dosimeters and survey meters have different purposes; required monitoring is determined by the authorised practice. Ordinary gloves, coveralls or a harness do not shield an exposed industrial gamma source. Select fall, lifting, eye and hearing protection for the actual access and drying work.
3. Eight-stage JSA
| Job stage | Hazards and effects | Failure factors | Technical and procedural controls | Site verification | P | S | R | A |
|---|---|---|---|---|---|---|---|---|
| 1. Plan and coordinate | 1. Unplanned irradiation2. Trade boundary breach3. Gas-work interference4. Wrong source technique | 1. Unclear licence scope2. No agreed work window3. Outdated site drawing4. Generator and gamma confused | 1. Confirm authorised practice2. Coordinate all work levels3. Separate RT and gas permits4. Define emergency contacts | 1. Licence and local rules2. Source or generator identity3. Access and occupancy plan4. Named radiation lead | ||||
| 2. Access and equipment | 1. Fall from rack2. Dropped guide tube3. Source equipment damage4. Trip in low light | 1. Incomplete platform2. Unsupported heavy device3. Damaged drive connection4. Faulty survey meter | 1. Provide safe working access2. Support device and guide tube3. Inspect matched components4. Function-check survey meter | 1. Platform and rescue plan2. Component identification3. Dosimetry and calibration4. Communication test | ||||
| 3. Set RT boundary | 1. Exposure outside barrier2. Entry during exposure3. Scatter to upper deck4. Occupied adjacent space | 1. Distance alone assumed safe2. Gaps in supervision3. Unmapped access routes4. Shield gaps overlooked | 1. Plan shielding and geometry2. Control every access route3. Survey relevant boundaries4. Adjust area before continuing | 1. Boundary and occupancy map2. Survey points and readings3. Warnings and observers4. Authorised exposure conditions | ||||
| 4. Expose and monitor | 1. Ionising radiation dose2. Lost area control3. Unexpected dose alarm4. Equipment movement | 1. Boundary watch lost2. Changed source geometry3. Unreliable communication4. Alarm dismissed | 1. Operate from safe position2. Maintain access surveillance3. Monitor planned locations4. Stop for changed conditions | 1. Exposure log2. Area control maintained3. Alarm response status4. Current survey evidence | ||||
| 5. Prove source safe | 1. Source remains exposed2. Entry before safe state3. Untrained source recovery4. Lost source accountability | 1. Indicator alone trusted2. Guide tube not surveyed3. Source jam unrecognised4. Survey instrument failure | 1. Retract by approved procedure2. Survey device and guide path3. Secure confirmed safe source4. Use specialist emergency plan | 1. Source-safe survey record2. Instrument function3. Device lock and inventory4. Radiation lead release | ||||
| 6. Prepare gas drying | 1. Manifold falling2. Stored gas energy3. Water slug impact4. Nitrogen oxygen depletion | 1. Unsupported temporary lines2. Wrong component ratings3. Trapped liquid4. Outlet near occupied space | 1. Lift and support manifolds2. Verify assembly limits3. Drain through planned points4. Provide safe gas discharge | 1. Gas identity and flow plan2. Rated temporary assembly3. Relief and restraint design4. Ventilation and gas assessment | ||||
| 7. Run drying | 1. Hose whip and fragments2. Outlet noise and debris3. Pressure beyond limits4. Oxygen-deficient atmosphere | 1. Rapid uncontrolled admission2. Blocked or unsafe outlet3. Restraint loosened4. Nitrogen controls missing | 1. Admit gas by approved stages2. Keep people clear of outlets3. Observe pressure and response4. Stop for gas or line anomaly | 1. Pressure and flow records2. Outlet exclusion control3. Restraints remain sound4. Atmosphere controls verified | ||||
| 8. Vent and hand over | 1. Trapped pressure release2. Gas reaccumulation3. Premature bolt removal4. Area released too early | 1. Gauge zero accepted alone2. Blocked bleed route3. Isolated pockets missed4. RT and gas releases mixed | 1. Isolate supply and prevent return2. Vent through secured path3. Prove each pocket safe4. Release RT and gas separately | 1. Pressure verification method2. Drain and vent locations3. Radiation source accounted for4. Recorded handover and defects |
PDF A covers basic task controls; B focuses on technical failures; C covers supervision, records and handover. The article has eight stages with four items per main cell; each PDF has six key stages with three items per main cell. P/S/R/A, measurements, confirmations and signatures remain blank for actual site assessment.
4. Fictional scenario and failure mechanisms
Retained educational illustration; not evidence of an actual incident.
The scenario and record comparisons are fictional teaching examples, not records of real incidents, measurements, inspections, signatures or approvals.
| Item | Fictional scenario |
|---|---|
| Initial situation | A hypothetical night exposure is planned near a multi-level pipe rack. |
| Changed condition | The ground-level barrier excludes one walkway but an upper platform remains occupied. |
| Failure path | Direct and scattered radiation can reach a location not covered by the initial access plan. |
| Possible outcome | An alarm or unexpected survey reading triggers withdrawal; no actual dose, injury or safe outcome is asserted. |
| Prevention barrier | Stop exposure using the approved procedure, maintain control and reassess geometry and all occupied levels. |
Failure mechanisms
Inverse-square distance estimates are an initial model for a suitable point-source geometry, not proof of a safe site boundary. Shielding, penetrations and scatter change the field; survey the relevant accessible locations and revisit the plan when conditions change.
A retracted indicator or completed crank movement cannot alone prove a gamma source is shielded. A functioning suitable survey instrument and the prescribed survey of device and guide path are needed before access. Do not approach or attempt improvised recovery after an abnormal indication.
Compressed gas stores energy and can accelerate retained water and debris. Nitrogen adds oxygen-displacement risk even when it has no irritating smell. Mechanical stability, controlled gas admission, safe discharge and atmosphere assessment are separate barriers.
Decision sequence
| Decision stage | What to verify |
|---|---|
| Known facts | Confirm the source type, work authority and actual occupied spaces. |
| Unresolved matters | Compare survey evidence with the required area and access-control arrangements. |
| Reason to hold | Stop if boundary control, communications or source-safe confirmation is missing. |
| Required evidence | Keep people out; obtain radiation-lead assessment or the specialist emergency response. |
| Restart decision | Release radiography and gas work independently using actual records and unresolved conditions. |
5. Conditional decisions and common errors
| Condition | Action | Evidence | Proceed when |
|---|---|---|---|
| Unexpected boundary reading | Stop exposure; reassess area | Survey map and occupancy | Boundary reverified |
| Source-safe state uncertain | Keep exclusion; notify specialist | Device and guide-path survey | Safe source state confirmed |
| Nitrogen drying proposed | Assess discharge and atmosphere | Gas plan and ventilation | Atmosphere controls ready |
| Gauge reads zero | Verify pockets and bleed path | Isolation and pressure evidence | Safe pressure state proven |
Similar situations, different decisions
The scenario and record comparisons are fictional teaching examples, not records of real incidents, measurements, inspections, signatures or approvals.
| Comparison | Situation A | Situation B |
|---|---|---|
| Gamma / X-ray | Gamma remains a source without power | X-ray shutdown requires its own verification |
| Survey / dosimetry | Survey maps radiation at a location | Dosimetry monitors personal exposure |
| Air / nitrogen | Both can release mechanical energy | Nitrogen adds oxygen-deficiency risk |
6. Roles and responsibilities
| Role | Responsibility |
|---|---|
| Work supervisor | Coordinate site access, licence conditions, other trades and separate RT/gas releases. |
| Technical reviewer | The radiation lead confirms surveys and source accountability; the pressure specialist confirms the drying assembly and limits. |
| Work crew | Operators maintain surveillance, follow authorised sequences and stop for unexpected readings or loss of control. |
Supervision, records, handover
| Job stage | Technical and procedural controls | Site verification |
|---|---|---|
| Plan and coordinate | 1. Record: Licence and local rules2. Review: Source or generator identity3. Confirm: Access and occupancy plan | 1. Source or generator identity2. Access and occupancy plan3. Named radiation lead |
| Set RT boundary | 1. Record: Boundary and occupancy map2. Review: Survey points and readings3. Confirm: Warnings and observers | 1. Survey points and readings2. Warnings and observers3. Authorised exposure conditions |
| Prove source safe | 1. Record: Source-safe survey record2. Review: Instrument function3. Confirm: Device lock and inventory | 1. Instrument function2. Device lock and inventory3. Radiation lead release |
| Prepare gas drying | 1. Record: Gas identity and flow plan2. Review: Rated temporary assembly3. Confirm: Relief and restraint design | 1. Rated temporary assembly2. Relief and restraint design3. Ventilation and gas assessment |
| Run drying | 1. Record: Pressure and flow records2. Review: Outlet exclusion control3. Confirm: Restraints remain sound | 1. Outlet exclusion control2. Restraints remain sound3. Atmosphere controls verified |
| Vent and hand over | 1. Record: Pressure verification method2. Review: Drain and vent locations3. Confirm: Radiation source accounted for | 1. Drain and vent locations2. Radiation source accounted for3. Recorded handover and defects |
7. Hold points and record comparison
| Hold point | Evidence before release | Confirmation / approval |
|---|---|---|
| Start | Planning site RT, safe access, instrument and equipment checks, supervised exposure, measured confirmation of the safe source state, followed by separately authorised preparation and controlled gas drying. | |
| HP-1 Access and equipment | Platform and rescue plan · Component identification · Dosimetry and calibration · Communication test | |
| HP-2 Set RT boundary | Boundary and occupancy map · Survey points and readings · Warnings and observers · Authorised exposure conditions | |
| HP-3 Prove source safe | Source-safe survey record · Instrument function · Device lock and inventory · Radiation lead release | |
| HP-4 Vent and hand over | Pressure verification method · Drain and vent locations · Radiation source accounted for · Recorded handover and defects |
Complete after actual checks. Recheck after changes, defects or shift handover.
Record comparison examples
The scenario and record comparisons are fictional teaching examples, not records of real incidents, measurements, inspections, signatures or approvals.
The boxes are static record prompts, not interactive or saved approvals. A tick does not establish suitability or permission to restart. Record the evidence, person, time and unresolved issues; retain the change history.
| Record type | Insufficient record | Record checklist |
|---|---|---|
| Boundary | Only OK | □ Boundary and occupancy map□ Survey points and readings□ Warnings and observers□ Authorised exposure conditions |
| Source | Only OK | □ Source-safe survey record□ Instrument function□ Device lock and inventory□ Radiation lead release |
| Gas | Only OK | □ Gas identity and flow plan□ Rated temporary assembly□ Relief and restraint design□ Ventilation and gas assessment |
| Handover | Only OK | □ Pressure verification method□ Drain and vent locations□ Radiation source accounted for□ Recorded handover and defects |
8. Site checklist and emergency response
| Check item | Result | Person / action |
|---|---|---|
| □ Plan and coordinate: Licence and local rules | ||
| □ Access and equipment: Platform and rescue plan | ||
| □ Set RT boundary: Boundary and occupancy map | ||
| □ Expose and monitor: Exposure log | ||
| □ Prove source safe: Source-safe survey record | ||
| □ Prepare gas drying: Gas identity and flow plan | ||
| □ Run drying: Pressure and flow records | ||
| □ Vent and hand over: Pressure verification method | ||
| □ Release / handover authority |
Stop work
Stop for a missing observer, failed survey meter, dose alarm, unauthorised entry, changed exposure geometry or uncertain source retraction. Separately stop drying for an unstable line, abnormal pressure, blocked outlet or failed atmosphere control.
Emergency response
Withdraw and keep others away. Use the approved remote shutdown only where safe, maintain or extend the controlled boundary through the radiation response plan and contact the designated specialist. Do not touch the source or dismantle a guide tube. For gas release or oxygen deficiency isolate remotely if safe; never attempt an unplanned rescue into the affected atmosphere.
9. Sources and review limits
2026-10-11
| Source | Scope and limitations |
|---|---|
| ARPANSA RPS C-4 | Official code landing page, scope and adoption/authorisation explanation reviewed; draft PDF not used as current law. |
| ARPANSA industrial radiography workers | Official worker guidance on training, equipment and controlled-area failures. |
| IAEA SSG-11 | International technical guidance; geometry, access control and surveys. |
| HSE GS4 | Foreign pressure-work technical reference, not Australian legislation. |
This is reference content written and revised with AI. It has not been verified or approved by a professional. Review by a suitably qualified professional and site authorisation are required before use.
10. PDF guidance and FAQ
PDF A covers basic task controls; B focuses on technical failures; C covers supervision, records and handover. The article has eight stages with four items per main cell; each PDF has six key stages with three items per main cell. P/S/R/A, measurements, confirmations and signatures remain blank for actual site assessment.
Content group ID
jsa-radiographic-testing
Is a fixed radius sufficient?
No. Occupancy, geometry, applicable requirements and measured boundary conditions determine the controlled area.
Does a normal indicator prove source retraction?
No. Complete the prescribed radiation survey with a functional instrument before access or dismantling.
Can an RT operator recover a jammed source?
Only personnel specifically authorised, trained and equipped under the emergency plan may perform recovery; routine operator qualification alone is insufficient.
Does zero pressure mean absolute vacuum?
No. A gauge indication relative to atmosphere is not zero absolute pressure and does not prove every trapped volume is safe.
Has a professional verified or approved this document?
No. Public sources and editorial, layout and consistency checks were reviewed using AI. No site inspection or professional technical approval has been performed. Obtain appropriate professional review before use.
11. Revision history and authorship
This is reference content written and revised with AI. It has not been verified or approved by a professional. Review by a suitably qualified professional and site authorisation are required before use.
| Date | Version | Change | Review status |
|---|---|---|---|
| 2026-07-06 | Original version unmarked | Original preserved | No professional approval |
| 2026-10-11 | 1.1 | Decisions, records, JSA and PDFs revised | No professional approval |
Retained trade coordination, elevated access, boundary control, source survey, temporary-manifold handling and controlled venting. Removed unsupported real-incident identities, distances and dose outcomes. Fixed 20 m or 22 m radii, universal 10 or 2.5 µSv/h limits, mandatory double-hook tie-off in every situation, 10% gas increments, 45-degree vent direction and a universal 110% relief setting are not used as site instructions. Zero gauge pressure is distinguished from zero absolute pressure; PPE and dosimetry are not credited as substitutes for exclusion and shielding.