NORM Store Dose Limits and Radon Rules in Qatar
October 17, 2026
12 min read
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The two numbers, up front
Article 10 of the rules attached to Decision 45 of 2013 puts two dose figures on a NORM waste store. Inside the store, which the article treats as the controlled area, the radiation dose must not exceed 7.5 microsievert per hour. Outside the store, in the supervised area, the dose must not exceed 2.5 microsievert per hour. Clause four asks that the store be provided with ventilation devices fitted with special filters, so that radon gas does not collect.
Four words before anything else. The microsievert is a small unit of dose: it measures what radiation does to a person, not how much material is present. Per hour makes it a rate, so the figure answers how fast, not how much in total. Radon is a radioactive gas that comes off radium-bearing material; it is heavy, so it pools in still air at low points rather than drifting away. The radiation background is the activity arising from natural cosmic and terrestrial sources, that is, what is there before any waste enters the store.
Three more words. NORM, in the name, is naturally occurring radioactive material, which the rules define as material in which the concentration of radionuclides rises because of what people do to it. In an oil or gas yard that means scale, the hard crust inside pipes, and sludge, the soft solid out of separators and tanks.
Is 7.5 a limit on the place or on the person?
On the place. The clause caps the dose rate inside the store and outside it, and says nothing about how long anyone may stand there or what any individual may receive in a year. An annual dose limit for a worker is not in this decision, so far as we have seen of it, and we do not import a figure from elsewhere into a page about this one.
The dose clause and the radon clause, read closely
Take the dose clause first. It names two places and gives each a ceiling, and it names the places by the zone language of clause two: the store is the controlled area, and the ring around it is the supervised area. So the two figures are not a worker limit and a public limit. They are a reading at one place and a reading at another, two metres further out at least.
That ordering matters, and it is the one thing in this clause that physics settles rather than wording. A dose rate falls as you move away from the source. So the inner figure is the larger of the two: 7.5 inside, 2.5 outside. Each ceiling applies to the highest reading at its place. If the highest reading at the barrier comes out above the highest reading inside the store, that is what to examine first: the instrument, the technique, the measurement geometry, material stored outside the store, or a leak that has reached the ring. Do not discard such a reading as instrument error before the ring itself has been checked. Point against point, the ordering does not always hold: a point inside the store far from the stack can read lower than a point on the barrier close to it, so the comparison that means something is between the two maxima, not between any two readings.
Now the radon clause. It does not give a radon concentration and does not name a measurement. It asks for a thing, ventilation devices fitted with special filters, and the purpose it gives is that radon gas should not collect. So compliance here is shown by the installation and by its upkeep, not by a number you can put in a report. And the filters are part of the requirement, not an optional extra on top of a fan.
The two clauses lean on each other. Ventilation that works lowers what sits in the air of the store, and the dose figure is a reading taken in that same air. Neither clause says so, and we are not asserting a link the text does not make. We are saying that a store failing one is likely to be examined on the other.
Where exactly is outside?
The clause says outside the store and names it the supervised area, and clause two fixes the supervised area as the barrier no less than two metres wide around the store. Reading the 2.5 figure as a reading taken in that ring, and at its outer line in particular, is our reading, and the clause does not spell out a point of measurement.
What these two clauses do not cover
They do not set an annual dose for any person. They do not say who measures, with what instrument, at what height, or how many points around the store. They do not give a survey interval; that duty sits in the monitoring clause of the same article, which asks for regular monitoring of storage areas to detect signs of leakage, and for documentation of it, without naming a period.
They also do not say what happens if a reading is above the ceiling. There is no instruction to empty the store, to add shielding, to re-pack, or to notify within a stated time. So far as we have seen of this decision there is no penalty word and no deadline attached to these two clauses, and we will not invent a consequence the clause does not carry.
And a boundary between numbers that look alike. The 0.5 microsievert per hour that appears in the equipment row of Annex 1 is an exemption level for a piece of equipment, including background at any accessible point. The 5 microsievert per hour in the transport article is a ceiling on the surface of a package, a package being defined in the rules as the radioactive material together with its packaging, prepared for transport. The 7.5 and 2.5 here are ceilings for two places in a store. Three doors, three rules, and we do not say they are the same limit.
Does the radon clause mean I must measure radon?
The clause asks for ventilation with special filters, and that is what it asks for. It does not require a radon measurement and gives no concentration to compare against. Many operators measure anyway, because it is the only way to know the ventilation is doing its job, but that is practice, not a requirement of this clause.
Two figures and two structural requirements
The table puts the two dose figures next to the two structural requirements they sit with, so the zone language is visible in one view.
Dose, zones and ventilation in article 10
| Where or what | The figure or requirement | The provision it rests on |
|---|---|---|
| Inside the store, the controlled area | Dose must not exceed 7.5 microsievert per hour | Article 10, clause 7, first limb: the dose inside the store, the controlled area, must not exceed 7.5 microsievert per hour |
| Outside it, the supervised area | Dose must not exceed 2.5 microsievert per hour | Article 10, clause 7, second limb: and outside it, the supervised area, the dose must not exceed 2.5 microsievert per hour |
| The ring we read outside the store onto — our reading | A barrier no less than two metres wide, with radiation warning signs on it | Article 10, clause 2: a barrier no less than two metres wide must surround the store and is the supervised area |
| The air in the store | Ventilation devices fitted with special filters, so radon does not collect; no concentration is given | Article 10, clause 4: ventilation devices fitted with special filters, so that radon gas does not collect |
Turning two numbers into a procedure
Write down where you will stand the instrument before you buy one. Pick fixed points: a set of positions inside the store and a set on the outer line of the barrier, marked on the floor so the next round repeats them. Readings at remembered positions are not comparable; readings at marked positions are.
Then take a baseline while the store is empty, so you know what the room reads without the waste in it. Then put the ventilation and its filters on a maintenance schedule with a named owner and a filter change interval, because a filter that is never changed is the part of this clause that fails quietly. Keep the sheets with the register that the article asks you to keep outside the store and close to it.
Worked example: what 7.5 means for two hours a day
Suppose a store reads right at the ceiling, 7.5 microsievert per hour at the working positions, and a storekeeper spends 2 hours a day inside it for 250 working days. The arithmetic is 7.5 times 2, that is 15 microsievert a day, times 250, that is 3,750 microsievert in the year, which is 3.75 millisievert, a millisievert being a thousand microsievert. At the barrier, where the ceiling is 2.5, the same two hours give 5 microsievert a day and 1,250 microsievert in the year. Two things follow. First, the place figure alone decides nothing about a person; occupancy does the rest of the work, and this decision sets no annual limit for a worker against which the total could be measured. Second, a store sitting at its ceiling is a store with no margin, so the sensible target is well below 7.5 rather than at it.
Questions we are actually asked
What do I do if my reading comes out above 7.5?
The clause does not say, so treat it as two separate questions. The technical question is what is driving the reading: how much is stored, how it is stacked, whether a container is leaking, whether your geometry is right. The regulatory question is what the Ministry of Environment and Climate Change expects you to do about it, and that is worth asking in writing rather than guessing.
Is the 2.5 figure a limit for the public?
The clause does not call it that. It calls it the figure outside the store, in the supervised area. Public exposure limits are the subject of other instruments and are not in this one, so we do not label the 2.5 microsievert per hour as a public limit.
Can I meet the figures with shielding instead of distance?
The clause sets readings, not methods, so it does not prescribe how you get there. What it does fix separately is the barrier no less than two metres wide, which is a distance requirement in its own right and is not traded away by adding material. So shielding may help the reading; it does not remove the barrier.
Does the ventilation have to run all the time?
The clause asks that stores be provided with ventilation devices fitted with special filters, so that radon gas does not collect. It does not set a duty cycle. Since the stated purpose is that the gas does not collect, and radon collects in still air, a system that is off most of the time is hard to square with the purpose. That inference is ours, and the clause gives no hours.
Do these figures apply to the collection area too?
No. They are written into the storage article and are about the store and its barrier. The collection article has its own requirements, including a barrier with warning signs, floor sheeting and wetting of dry contaminated material, and it carries no dose figure. Reading a storage ceiling onto a collection yard would be putting a number where the decision puts none.
Technical note
A dose rate is not a property of the store; it is a property of a point in the store at a moment. Move half a metre, or empty half the barrels, and the number changes. So a single figure reported for a store is a summary of a set of readings, and the useful record keeps the set and the positions, not the summary alone.
Three instrument cautions. First, background is in your reading. The Annex 1 equipment row says so explicitly for its own figure, and the storage clause does not mention background at all, so whether 7.5 is read with or without it is not settled by the wording. Say which convention your sheet uses. Second, a dose-rate meter responds to gamma well and to alpha and beta poorly or not at all, so a NORM store reading is largely a gamma reading. Third, radon is a gas and a dose-rate meter is not a radon monitor; the two questions need two instruments. These are matters of measurement, not of wording.
Who holds the instrument is a separate question. The surveying, the marking of positions and the record are the work of whoever is appointed at the site. This is what we train people to do; it is not work we carry out.
How DITEC helps, and where its work stops
The common failure we are called about is not a high reading. It is a store with no baseline and no marked positions, so nobody can say whether today is worse than last quarter. We train on reading article 10 and on building a survey procedure that repeats.
ALDuha Institute for Training and Environmental Consulting (DITEC) works in training and consulting. The Institute does not run a laboratory analysis service, does not calibrate instruments, and does not test equipment. Field survey work is arranged through specialist partners.
Our training is licensed. Nothing here is an undertaking that a licence will be issued, and nothing here promises how long any application takes. The decision rests with the Ministry of Environment and Climate Change, Radiation Protection Department.
Reference: DITEC Experts and the Radiation Protection team. This page is an introductory explanation of a published decision and is not a legal opinion.
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