NORM in Oil and Gas: When Scale Becomes a Regulatory Matter
September 16, 2026
8 min read
DITEC Experts, Radiation Protection Team, ALDuha Institute for Training and Environmental Consulting
Why a pipe becomes radioactive
Naturally occurring radioactive material — NORM — is exactly what the name says: radionuclides that have always been in the rock. Uranium and thorium in the reservoir formation decay through long chains, and two of their daughters, radium-226 and radium-228, are soluble enough in formation water to travel with it up the well.
As pressure and temperature drop on the way up, sulphate scale — mostly barium and strontium sulphate — precipitates on the inside of tubulars and equipment. Radium behaves chemically like barium, so it comes out of solution with the scale and stays there. The oil itself is not the issue; the deposit left behind is.
In gas processing the same story has a different ending: lead-210 and polonium-210 plate out as thin films inside equipment handling gas streams, and radon progeny can accumulate in vessels that are opened for maintenance.
Where it shows up
Intact equipment in service is rarely the exposure problem. The exposure problem appears when the deposit is disturbed: when tubing is cut, descaled, ground or water-blasted, when a vessel is entered, when sludge is shovelled out of a tank. That is the moment a fixed deposit becomes airborne dust that can be inhaled.
- Production tubing and downhole equipment, where scale is thickest.
- Wellheads, chokes, manifolds and separators.
- Water handling: produced water lines, skimmers and storage tanks, where the sludge settles.
- Gas plant equipment, pumps, compressors and valves, as thin films rather than thick scale.
- Pigging waste, filter elements and sand recovered during cleaning operations.
- Yards where used tubulars are stacked, and workshops where they are cleaned or cut.
The point at which it becomes regulatory
Every barrel of oil brings up some natural radioactivity; that alone regulates nothing. What matters is activity concentration — how much radioactivity there is per unit mass of the material in question — and whether it exceeds the exemption or clearance values set by the regulator.
Below those values the material is handled as ordinary industrial waste. Above them it falls inside the regulatory system: it has to be identified, controlled, recorded and disposed of through an authorised route, and the people working with it are treated as occupationally exposed. The values themselves are set nationally, and the operative ones for a facility in Qatar are those in the executive regulation and in its own licence conditions — which is why the question is never answered from a textbook.
You cannot see it, and you cannot smell it
Scale that contains radium looks exactly like scale that does not. The only way to know which one is in front of you is measurement, and the only way to know how much is there is analysis. Assuming a line is clean because it always has been is not a finding; it is an absence of one.
What an operator is expected to have
The commercial risk is usually not the dose. It is a consignment of used tubulars refused at a scrapyard, a contractor's workshop shut down mid-campaign, or a waste stream that nobody will accept because its status was never established.
Frequently asked questions
Is NORM dangerous to work near?
External dose rates from scale inside intact equipment are usually low. The concern is internal: inhaling or ingesting dust when the deposit is broken up. That is why the controls concentrate on dust, not on distance.
Can used tubulars be sold as scrap?
Not until their status is established. Material above the clearance values cannot enter the ordinary scrap stream, and a smelter that detects activity at its gate will reject the load and report it — a far more expensive outcome than checking first.
Do we need a radiation licence for NORM?
It depends on the activity concentrations and quantities involved and on how the national regulation treats them. A facility that has never assessed its streams cannot answer that question, and the assessment is the first step rather than the licence.
Does ALDuha Institute carry out NORM surveys?
No. The Institute does not perform NORM field surveys, laboratory analysis or remediation work. What it provides is training for the people who manage and carry out this work, and consulting on design, procedures and the regulatory framework around it.
Training and consulting
ALDuha Institute for Training and Environmental Consulting delivers NORM awareness and radiation protection training for oil and gas personnel in Qatar, and advises on procedures, worker protection arrangements and the design of facilities where affected equipment is handled.