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Ionising Radiation Assessment, Monitoring & Practical Protection Services

granite_black_pic1_400Ionactive offer a range of assessment, monitoring and practical protection facilities. These are based on our practical knowledge and experience obtained over many years of working with many different types of ionising radiation source.

Our experience allows us to recognise the potential problems inherent in radiation detection and measurement and work with our clients to implement optimal solutions that meet regulatory requirements.

We work with many suppliers to ensure our equipment is suitable.

We have the capability to undertake onsite gamma spectrometry measurements with instant analysis by PC. This can be used to search for and identify radioactive substances in the workplace or field. The same equipment can be used to record and store varying dose rate fields over time and is excellent for radiological assessments and exposure analysis.

We have carefully selected our dose rate monitoring equipment to meet client needs (e.g measurement of pulsed radiations, intrinsically safe dose rate monitoring and measurement of low energy x-ray scatter).



Radioactive Source Leak Tests (wipe tests)

A source leak test (sometimes known as a wipe test) may be required:

  • By Regulation 27 of the Ionising Radiations Regulations 1999 (IRR99)
  • By Conditions set in the Registrations and Authorisations issued under the Radioactive Substances Act 1993
  • For critical examinations (involving radioactive substances)

See our IRR99 Guidance pages for more information on the regulatory requirements for leak tests (opens in a new window).


Whilst a wipe test followed by laboratory analysis may be an adequate method of leak testing, this is not always the case. We will ensure that the best method is used, taking into account the type of source, the radioactive material it contains, and the counting efficiencies of portable monitoring equipment vs our lab based equipment. As a general rule, if a leak test is required it should be performed every two years. Such tests will be compliant to at least ISO 9978. 

Work Place Monitoring / Environmental Assessment

Many employers have discovered legacy radioactive materials during refurbishment work, during laboratory clearance or whilst decommissioning equipment. Finding this material is never usually welcome, but is even less so when found unexpectedly during the critical phases of a project.

We pride ourselves on having practical work based experience in using many types of monitoring equipment to do just this type of work for you. Our principal Radiation Protection Adviser (RPA) has extensive and unique decommissioning experience in the small user / non-nuclear sector; the Environment Agency has also specifically recognised our RPA's experience in this area.

If you cease working with radioactive materials, you will not be able to have your Radioactive Substances Act 1999 authorisation revoked until you can prove that your laboratories and associated plumbing and ducting are free from radioactive materials. We can help you with these end point clearance surveys and determine the appropriate clearance criteria.

Critical Examinations

We offer a comprehensive Critical Examination service for x-ray or other equipment (including 'live source' applications) undergoing installation, reconfiguration or after general servicing. Our work in this area currently includes postal security scanners, port scanners, linac deep scanning applications and airport baggage x-ray machines.

See our IRR99 Guidance pages for more information on the regulatory requirements for critical examinations and duties of manufacturers / suppliers (opens in a new window).

Radiological Assessment

We provide a full radiological assessment service for the non-nuclear sector. Radiological assessment can encompass simple radiation risk assessments through to compressive probabilistic safety assessments. Assessments we are involved in include:

  • Authorisation / Registration applications (including BPM assessments)
  • X-ray machine design and shielding calculations
  • MicroShield (and other industry code) shielding design (e.g. NDT)
  • Laboratory and waste store design or refurbishment
  • REPPIR: source dispersal assessment (e.g. lapse of special form status)
  • Portable XRF (e.g. Niton) workplace risk assessments