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Radiation Monitoring

Stay protected, stay safe.

In addition to providing advice on which equipment best suits your needs before purchase, Radsol can also source equipment on your behalf or advise you on the best supplier. We can also assist with ensuring your operation is using the most suitable equipment for your operations and meets the specific personal safety around personal dosimetry.

The most used radiation survey meters are:

  • Radiation survey meters – typically measured in uSv/h or counts/second
  • Contamination survey meters – typically measured in Bq/cm2 or counts/second
  • Combination meters
  • Ancillary equipment such as dose equivalent filters

Radsol has partnerships with several suppliers of specialty radiation monitoring equipment that can supply the above equipment.

Individual Monitoring

There are two main types of personal radiation monitoring devices – Personal Electronic Dosimeters and Passive Personal Radiation Monitoring Devices (OSL or TLD).

The advantage of using Personal Electronic Dosimeters over passive devices like Thermoluminescent Devices (TLD) or Optically Stimulated Luminescence (OSL) is that they can be used to provide live information on your radiation exposure (often both dose and dose rate), which provides the wearer with situational awareness and the ability to actively manage (and reduce) their radiation exposure in real-time.

Radsol radiation monitoring

Specific Monitoring Requirements

When purchasing a survey meter, you should consider your specific monitoring requirements by answering the following questions:

  • What type of radiation do you need to detect (gamma, x-ray, alpha, beta, neutron)?
  • Do you need to be able to accurately measure radiation levels or contamination or detect radiation?
  • What is the energy of the radiation you need to detect?
  • Does your survey meter need to be intrinsically safe?
  • Are there any legislative requirements related to the type of radiation equipment in use? For example, Industrial Radiography Companies are required to have an analogue gauge and be able to measure up to 10mSv/h.

Typically, survey meters are calibrated for 662keV photons (emitted by Cs-137); however, different isotopes have various discrete energy characteristics.

If you are using a radiation source that is not Cs-137, possible solutions may include:

  • Applying knowledge of your survey meter energy response curve to obtain a relevant correction factor or
  • Consider an energy-compensated survey meter or one that can have an energy-compensation filter added to
  • Incorporating a Gieger-Muller tube. These are cost-effective, rugged and reliable. However, there are other alternatives, such as purchasing a survey meter that incorporates an Ion chamber, which will respond accurately to a spectrum of radiation energies (including x-rays).

Measuring neutron radiation requires alternatives to typical radiation detection methods. While readily available, Neutron survey meters are expensive and bulky. An alternative is to obtain a neutron-to-gamma dose rate conversion factor for both an unshielded source and one that takes into account the device shielding profile.

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