Radiation monitoring

The objective of radiation monitoring is to ensure that existing safety procedures are effective at keeping dosage and exposures from scattered or incidental radiation as low as reasonably achievable (ALARA).

Personal radiation monitoring badges

Required for users of radioactive substances and x-ray or neutron equipment.

If you work with ionising radiation, you’ll need to apply for a personal radiation monitoring badge. These badges are issued on a monthly or quarterly basis and monitor exposures from incidental and scattered radiation. The badges are not appropriate for low energy beta emitters such as 3H or 35S. To obtain a badge contact your local Radiation Safety Supervisor (RSS). When the badge arrives you can collect it from your RSS or nominated badge coordinator.

Biological monitoring

Required for users routinely handling equal or greater activities per procedure of the following radionuclides: 120 MBq 3H, 5 MBq 14C, 5 MBq 35S or 0.1 MBq 125I.

Urinalysis is required for users of 3H, 14C or 35S. Thyroid analysis is required for 125I. The frequency of monitoring will be determined by the University Radiation Safety Officer (RSO) for different categories of workers and submitted to the WA Radiological Council for approval.

Contact the Radiation Safety Officer for more information.

Wipe testing

Required for users of low energy beta emitting unsealed radioactive substances or contamination testing in radioisotope areas with high level background fields.

Groups using unsealed radioisotopes are required to conduct monthly wipe tests of all radioisotope laboratories. A summary of the results of the wipe test must be forwarded to the local RSS and RSO.

Download the instructions and results form for performing a wipe test [.doc – 51kB]

Radiation surveys

Required for users of radioactive substances and x-ray equipment.

If you’re using beta and gamma emitting radionuclides, survey your area before and after any procedure involving radionuclides to ensure no contamination is present. A Geiger counter (preferable for betas) or Scintillation monitor (preferable for gammas) is normally used. Clean any contamination immediately.

If you’re using partially enclosed x-ray units, perform a radiation survey on a monthly basis to check for radiation leakage from the machine. For totally enclosed x-ray units, perform the radiation survey quarterly. The dose at any accessible point 5 cm from the surface must not exceed 25 µGy per hour whilst the instrument is operating at maximum power.