Controlled and Supervised Areas in Qatar's Regulation
September 19, 2026
9 min read
DITEC Experts, Radiation Protection Team, ALDuha Institute for Training and Environmental Consulting
The division is the licensee's job, not the regulator's
Article 26 opens by assigning the work: the licensee divides the areas surrounding radiation devices or radioactive sources into two classes, controlled areas and supervised areas. The verb belongs to the licensee. Nobody arrives to draw the lines for you, and a facility with no designated areas has not deferred a decision - it has failed to perform a duty.
The second sentence of the same opening is the one that gets forgotten, because it has no deadline and no form to fill in. The licensee must carry out a periodic review of working conditions, for the purpose of determining what necessity may require by way of modifying the protection measures or the safety arrangements, including the boundaries of the controlled and the supervised areas. The boundaries are not drawn once. They are reviewed, and moved when the work moves.
The number that decides which class an area falls into
A controlled area is not a matter of judgement. Article 26(1) sets it by measurement: special areas for control must be established in places where workers may be occupationally exposed to doses that may exceed three tenths of any of the equivalent, effective or committed occupational dose limits the Committee sets.
Three tenths - 0.3 of the limit. Three features of that wording decide real cases. It says may exceed, so the test is potential exposure and not recorded exposure: an area qualifies before anyone has actually received the dose. It says any of the equivalent, effective or committed limits, so exceeding any one of the three is enough. And the limits themselves are the ones the Committee sets, which is why the classification has to be revisited whenever those are revised.
This is also why area monitoring, and not paperwork, is what establishes a controlled area. A boundary asserted without measurement is an opinion; the article asks for a threshold.
Four duties inside a controlled area
Article 26(1) attaches four obligations to the licensee in respect of these areas. They are written in the order a site actually builds them.
The four
Physical boundary - and the moving-source case
- The area is enclosed by fixed means.
- Where the source is used intermittently or moves from place to place, the article provides the alternative instead of leaving a gap: the appropriate controlled area is designated and surrounded by barriers, and the times and periods of exposure are determined by suitable means. This is the clause that governs industrial radiography and any portable gauge work.
Signage at the right places
- Approved warning signs and any appropriate instructions are fixed at the potential approach points to the controlled areas, and at various locations inside them.
- Two words carry the weight. Potential approach points - not just the main door, but every way a person could arrive. And inside as well as at the boundary, which a sign on the entrance alone does not satisfy.
Local rules matched to the area
- All occupational protection and safety procedures are taken, including the local rules and methods appropriate to each controlled area.
- Per area, not per facility. One set of site rules covering three different controlled areas with three different hazards does not meet the wording.
Control of approach
- Approach routes are controlled by administrative means - entry and work permits, the fixing of barriers and doors, and the fitting of locks.
- The intensity of the control must be proportionate to the nature of the potential hazards, and the article singles out the provision of protective clothing and of the necessary equipment where needed.
The supervised area, and why it is not a weaker controlled area
Article 26(2) defines a supervised area by what it needs rather than by a number: areas where the conditions of occupational exposure need to remain under review, even if specific protection measures and safety provisions are not normally required.
The two duties are correspondingly light: mark the boundaries of these areas using appropriate means, and place approved signs at the suitable entry points leading into them. No permits, no locks, no protective clothing requirement.
The point of the class is surveillance, not restriction. A supervised area is where you have decided that conditions are acceptable today and that you will keep checking - which is exactly what the periodic review in the opening of Article 26 is for. Treating it as a filing category rather than a monitoring commitment is the common error, and it is the one that turns a supervised area into an undeclared controlled area over time as workload grows.
The two classes side by side
Article 26 - what differs
| The question | Controlled area | Supervised area |
|---|---|---|
| What puts an area in this class | Potential occupational dose may exceed three tenths (0.3) of any of the limits set by the Committee | Exposure conditions need to remain under review, though specific protective measures are not normally required |
| Boundary | Fixed means; barriers plus timed exposure control where the source moves | Marked by appropriate means |
| Signs | At potential approach points and at various locations inside | Approved signs at the appropriate entry points |
| Access | Controlled administratively - entry and work permits, barriers, doors, locks - proportionate to the hazard | Not prescribed by Article 26 |
| Local rules | Required, and matched to each controlled area | Not prescribed by Article 26 |
Frequently asked questions
Our doses have always been far below the limit. Do we still need a controlled area?
The test in Article 26(1) is may exceed, applied to potential occupational exposure, not to the doses actually recorded. A facility whose results are low because its controls are good has demonstrated that the controls work, which is not the same as demonstrating that the area never needed them.
The source is portable and the work moves between sites. Where is the area?
Article 26(1)(a) addresses this directly rather than leaving it to practice. Where the source is used intermittently or moves, the appropriate controlled area is designated and surrounded by barriers for the occasion, and the times and periods of exposure are determined by appropriate means. The area travels with the work; the duty does not lapse because the geometry changed.
How often is the periodic review of area boundaries?
Article 26 requires the review to be periodic and states its purpose - determining what necessity may require by way of modifying the protection measures or the safety arrangements, including the boundaries themselves - without fixing an interval. In practice the trigger matters more than the calendar: a change of source, of workload, of layout or of shift pattern is what makes yesterday's boundary wrong.
Is a radiation warning sticker on the door enough?
Not on the wording. Article 26(1)(b) requires approved warning signs and any appropriate instructions at the potential approach points and at various locations inside the area. A single sticker addresses one approach point and nothing inside.
How the Institute can help
Area classification is where a radiation protection programme either becomes real or stays on paper, because it is the one part that a visitor can see in thirty seconds.
ALDuha Institute advises on area classification and the local rules that go with it, and trains the people who have to apply them - designating controlled and supervised areas against the Article 26 threshold, writing local rules per area rather than per site, and setting the review triggers so the boundaries follow the work.
Scope of what the Institute does: training and consulting. Field radiation surveys are carried out through specialist partners working in the field. The Institute does not carry out laboratory analysis, instrument calibration or equipment testing.
This explanation is published for awareness by the radiation protection team at ALDuha Institute for Training and Environmental Consulting. The English text is an explanation, not a certified translation: the Arabic text published in the Official Gazette governs in case of any difference, and this article does not replace the official text or advice from the competent authority. Last updated 19 September 2026.