1. Gauges and well logging
Basic Safety Requirements
Day 6 – Lecture 4

2. Objectives
To give an understanding of the way design features, safety and warning systems, maintenance and safe working procedures contribute to the restriction of exposure
Lecture notes:
Instructions for the lecturer/trainer

3. Content Design features Safety and warning systems
Equipment maintenance
Leak testing of sources
Security and storage of portable equipment
Safe working procedures
Source handling
Supervised area
(i) any area or place external to the radiation source room being
assessed, and
(ii) able to be accessed by members of the public or persons who are
occupationally exposed but who are not involved in carrying out a
radiation practice for the possession licensee at the premises.
Controlled are a
(i) any area or place within the premises but outside of the radiation
source room being assessed, and
(ii) normally only occupied by occupationally exposed persons
involved in carrying out a radiation practice for the possession
licensee at the premises.
‘Type 3 area’ is any area, within the radiation source room being
assessed, that is protected by fixed or movable protective barriers or
screens (e.g. operator consoles).
Instructions for the lecturer/trainer

4. Design Features Design features include:
shielding provided by the source housing
source shutter
features to prevent access

5. Source housing

6. Source shutter
Rotating or sliding metal device to shield primary beam when not in use
may be manually or electrically operated

7. Prevention of access Prevention of access can be achieved by:
physical barriers
shielded panels
close positioning of source housing and detector
interlocked access gates

8. Prevention of access Physical barriers

9. Prevention of access Shielded panels

10. Prevention of access shielded panels

11. Prevention of access Positioning of source and detector

12. Prevention of access Positioning of source and detector

13. Safety and warning systems
Safety and warning systems include:
shutter condition warning lights
signs and notices
A conspicuous radiation warning sign must be displayed adjacent to the
industrial radiation gauge. This sign must be:
(a) made of material resistant to weather, dust and fumes likely to be
present; and
(b) clean, intact and in a legible condition; and
(c) securely attached
This sign must contain the following information:
• radiation warning symbol (trefoil)
• the word ‘caution’ or ‘warning’
• words to the effect of ‘fixed radiation gauge containing radiation
source’
The symbol and lettering must be black on a yellow background.

14. Shutter condition warning lights
This illuminated radiation warning sign must be connected into
generator circuit in such a way that:
(a) it illuminates when radiation source is in the on position
(b) it does not illuminate at any other time.
A radiation warning sign combined with a light is also acceptable.
The illuminated warning sign or light must be fail safe (ie. turns the beam off if
the sign or light fails), or adequate warning that a sign or light has failed must
be indicated in a clear and unambiguous manner.

15. Signs and notices
conspicuous radiation warning sign must be displayed adjacent to the
industrial radiation gauge. This sign must be:
(a) made of material resistant to weather, dust and fumes likely to be
present; and
(b) clean, intact and in a legible condition; and
(c) securely attached
This sign must contain the following information:
• radiation warning symbol (trefoil)
• the word ‘caution’ or ‘warning’
• words to the effect of ‘fixed radiation gauge containing radiation
source’
The symbol and lettering must be black on a yellow background.

16. Equipment maintenance
Regular inspection and maintenance necessary to:
ensure smooth operation of source shutter
check general condition of gauge
check legibility of warning notices
check operation of any interlocks or warning lights
ensure that other equipment, such as transport case, is in good condition

17. Equipment maintenance Portable gauges
Checking that source has retracted properly
Cleaning of gauge and source aperture
Condition of transport case

18. Equipment maintenance Fixed gauges
Routine Maintenance
and Lubrication
Non-Routine Maintenance
and Lubrication
survey meter
Manufacturer’s Instructions
Approved Supplies
Training or supervison
Safety
Checklist
gauge disassembled
Safety
Checklist
RPO Authorization
Maintenance Procedures
Survey Meter
Dosimetry?
dosimeter

19. Equipment Maintenance Well logging
Safety Checklist
Survey Meter
Dosimetry
Procedures for removing “O” rings
Jigs, remote tools
Dosimeter
Remote Tool
Sealed Source
Survey Meter
“O” ring
Jig or Support

20. Leak testing Sealed sources should be periodically tested for leakage
Records of test should be kept
Primary mechanism for restricting radiation doses is the control of access to areas where there is a potential for significant exposure.
IAEA BSS defines two types of radiation areas : controlled and supervised areas.
Need to classify determined by means of a prior safety assessment.
Controlled areas : where specific protective measures/safety provisions required for controlling normal exposures and/or prevention or limiting the extent od any potential exposures

21. Security and storage of portable equipment
Consider security of fixed gauges
Consider security and storage of:
portable gauges
fixed gauges used on temporary sites
Primary mechanism for restricting radiation doses is the control of access to areas where there is a potential for significant exposure.
IAEA BSS defines two types of radiation areas : controlled and supervised areas.
Need to classify determined by means of a prior safety assessment.
Controlled areas : where specific protective measures/safety provisions required for controlling normal exposures and/or prevention or limiting the extent od any potential exposures

22. Security of portable gauges
Constant surveillance when in use

23. Security of portable gauges
Suitable gauge store on each site

24. Security of portable gauges
Adequate surveillance during transport

25. Security of fixed gauges at temporary jobsites
Radioactive Material,
Special Form, N.O.S.
DOT Type A
UN2974
During Transportation
and Storage
At the Job Site
WARNING
GaugeTech
Contact
removing!
before

26. Security of fixed gauges
WARNING
GaugeTech
Contact
removing!
before
WARNING
GaugeTech
Contact
removing!
before

27. Security of well logging materials
Downhole storage
Locked above ground storage

28. Elements for Safe Working Procedures Portable gauges
Manufacturer instructions for use
Routine and non-routine maintenance
Instructions for safe use
Radiation monitoring
Access control
Responsibilities
Record keeping
Emergency procedures and contacts
Storage and transportation

29. Elements for Safe Working Procedures Fixed gauges
Manufacturer instructions for use
Routine and non-routine maintenance
Radiation monitoring
Access control
Radiation Work Permits for entry to some areas
Responsibilities
Emergency procedures and contacts

30. Elements for Safe Working Procedures Well logging
Security during storage and transportation
Receipt and opening of packages
Control and surveillance during use
Source handling procedures
Use of remote handling tools
Radiation monitoring
Access control
Responsibilities

31. Elements for Safe Working Procedures
Well logging
Record keeping
Inspection and maintenance of equipment
Emergency procedures and contacts
Abandonment procedures
Damaged source procedures

32. Sealed source handling
Well logging
Sealed source handling
Removing source from the transport container
Loading source into transport container

33. Sealed source handling
Well logging
Sealed source handling
Installing sealed source into well logging tool
Tightening sealed source to a specified torque

34. Sealed source handling
Well logging
Sealed source handling
Installing source cap to secure source and tightening to a specified torque
Select proper source cap

35. Summary Basic safety requirements to restrict exposure
design features
safety and warning systems
equipment maintenance
leak testing of sources
security and storage
safe working procedures
source handling
Any questions or comments?
Lecture notes:
Instructions for the lecturer/trainer