Maximising safety with gamma radiography

On site gamma radiography

Radiographic inspections are very useful for testing the quality and remaining life of metals and metal products. However, the tests involve using materials that can be hazardous in the wrong hands. To prevent this, it is important to rely on expert technicians. Format NDT Ltd ticks this box, offering the safest on site gamma radiography.

Risk of exposure

The problem with providing radiography on a site is there is a higher risk of exposure. It is easier to control this if you are testing a metal or product in a lab where you can control all of the conditions. However, on a site there could be more people in the area. It is also harder to use enclosures.

Luckily, there is radiographic equipment that you can use on sites. These products have to meet minimum requirements for gamma ray sources. The standard is ISO 2919:2012. This dictates how the radioactive material must be stored. It has to be within an exposure container that complies with ISO 3999:2004. It must only be possible to expose it with a definitive action. That prevents accidental releases.


The gamma source containers for radiography can have one of three classifications. The first is class F. They are fixed units which can only be used in a set working location. These are what you find in formal labs, usually within enclosures.

A second option is class M. These containers are mobile but not entirely portable. Moving them requires the use of a trolley or similar item. They may be suitable for on site use but it is vital to think about the mobility.

The final type of enclosure is class P. These are entirely portable devices, generally with a mass that does not exceed 50kg so one or two people can carry them. If you choose on site gamma radiography these are the container you are most likely to see.


The devices can be categorised in two further ways based on how the technician exposes the radioactive source.

Category I devices operate without removing the source from the container. Instead it is possible to remove a small section of the shielding or move the source slightly. This exposes a small beam that the technician can aim at the item they are testing.

Category II devices are a little different. They are known as projection systems because the source can move out of the container along a tube sheath. Once it reaches the exposure head it will project a beam.

Ask us about on site gamma radiography

Format NDT Ltd understands the potential hazards with radiography. We work to offer the safest services, ensuring we account for the safety of our own technicians and anyone on the site where we are testing. A big part of this is using the right equipment, storing it correctly, and maintaining it. We also ensure that all technicians have the right skills.

So, if you want on site gamma radiography services, rely on us. We can provide them for various sites, allowing testing in-situ.