Exemption Levels for Soil, Sludge and Scale in Qatar

Three rows, three streams, three sets of isotopes

A separator vessel is opened and a pile of solids comes out. A yard has soil under an old tank. A pipe has a hard crust on its inner wall. These are three different streams in Annex 1, and each row names its own isotopes and its own figure. A single number does not cross from one row to another.

Two words first. An isotope is one form of an element, and the rows name them by symbol and number, such as radium 226. A becquerel per gram is a concentration: decays per second in each gram of the material, which is how a laboratory reports a solid sample.

The gate for all three rows is the same gate: article 5. Below the levels of Annex 1 the exemption applies, and it is an exemption from applying the regulations in force. Above them the wording of the article is that the material is treated as radioactive contaminants, and collecting, transporting, storing and disposing of it are required under these rules.

The three rows, transcribed

Soil and sludge: exemption levels for soil contaminated with sludge of naturally occurring radioactive material with the isotope radium 226 or radium 228, lower than 0.185 picocurie per gram for soil of 15 cm depth, or 5.55 becquerel per gram for soil deeper than 15 cm, over an area of 100 square metres above the natural background level; or a portable instrument reading of 0.25 microsievert per hour above the natural background level.

Hard scale in oil equipment: the radioactive activity of the radioactive isotopes radium 226 or radium 228 not exceeding 1.1 becquerel per gram in oil equipment.

Hard scale in gas equipment: the radioactive activity of the radioactive isotopes lead 210 or polonium 210 not exceeding 0.2 becquerel per gram in gas equipment. The oil row and the gas row name different isotopes and different figures, and the gas figure is the smallest number in the whole annex.

The soil row carries two units, and we do not reconcile them

This is the most important line on the page. The soil and sludge row names two units inside one sentence: picocurie per gram for the shallower depth, and becquerel per gram for the deeper one. The two are different units of the same kind of quantity, and by our own arithmetic 0.185 picocurie per gram is close to 6.85 becquerel per gram, which is not 5.55.

What we do with that is exactly three things. We transcribe the row as it stands. We record the difference and attribute the arithmetic to ourselves. And we put it to the Ministry as a question. What we do not do is convert one figure into the other, or assume the text means one unit and wrote another, or quietly correct it. A published figure is not ours to amend, and a facility that builds a file on a converted number has built it on our arithmetic rather than on the text.

The row has two further features that are easy to miss. The figures are tied to a depth, 15 cm and more than 15 cm, and to an area of 100 square metres. And it offers a second route that is not a laboratory route at all: a portable instrument reading of 0.25 microsievert per hour above the natural background level. Note the words above the background here, which are not the words of the equipment row, where the background is included in the figure.

Why a sludge pile is the hardest of the three

Scale is a deposit on a surface and it is reasonably uniform where it forms. Soil is layered, and the row answers that with a depth and an area. Sludge is a mixture by its nature: solids, heavy hydrocarbons, sand and corrosion products in one pile. So one sample from one drum describes that drum and not the pile.

The practical consequence is in the paperwork rather than in the figure. Keep the sample record and the stream record as two separate things, write how many samples were taken and from where, and never let a single result stand as the description of a heap. And because the soil row speaks of soil contaminated with sludge, the name on the record matters: a pile called soil and a pile called sludge are not read against the same line of the annex in the same way.

What to do with a pile in front of you

The order below is reading and record keeping. It is not a laboratory method and it does not produce a result.

Frequently asked questions

Technical note

Watch the reference level in each row. The equipment row says the background is included in its dose figure. The soil row says above the natural background level. Those are opposite instructions about the same background, and using one row habit on the other row changes the answer.

And a mixture is not described by one number. Sludge is solids, hydrocarbons, sand and corrosion products together, so the sampling plan is part of the result and belongs in the record beside it.

One more thing on measurement, because every figure on this page is a measured figure. The reading is taken by someone qualified to take it, with an instrument whose calibration is current and whose response was checked before the work, and the instrument has to respond to the radiation actually present and at the energies present. A gamma probe does not reliably detect an alpha emitter. And a result is written down with its date, its instrument and its method, because a reading without those three is not evidence a year later.

Where DITEC stands, and what this text is

ALDuha Institute for Training and Environmental Consulting (DITEC) works in training and consulting only. Naming a stream against the annex, and building the records that a sample result sits in, is training and consulting work. Producing the result is laboratory work. The Institute does not run a laboratory analysis service, does not calibrate instruments and does not test equipment, and field surveys are carried out through specialist partners. Licensed training is what the Institute offers, and nothing in a training programme or in this explanation is an undertaking that a licence will be issued or that it will be issued within any period.

A note on the authority: the text names the Ministry of Environment. Today that competence sits with the Ministry of Environment and Climate Change, Radiation Protection Department. The unit question in the soil row is one we put to that department. The successor reading is ours, not the wording of the decision, and where the decision is quoted, the original wording is kept in the Arabic text of this article.

This article is an introductory explanation of a published regulatory text and is not a legal opinion.