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IMPACT ON PEOPLE AND THE ENVIRONMENT
Dose

WORKED EXAMPLE: OVEREXPOSURE AT A HOSPITAL

 
Summary:
 
  • One person, not a radiation worker
  • Effective whole body dose between 80–100 mSv
  • No symptoms; no deterministic health effect expected

Scenario

While a service person was installing and adjusting a new radiotherapy machine in a hospital, he was not aware of an electrician working above the ceiling. He tested the machine, pointing the radiation beam towards the ceiling and the electrician was probably exposed. The estimated whole body exposure range was between 80 mSv and 100 mSv effective dose. The electrician had no symptoms but as a precaution a blood test was undertaken. As would be expected for this level of dose, the blood test was negative.

INES procedure (click the highlighted flowchart items to follow the procedure)

Figure 4, page 145 of the Manual

Figure 5, page 146 of the Manual

Determine rating based on doses to individuals

Check the answer

Answer

The total dose was between 80–100 mSv to a single member of the public.

Level 2 is the minimum level for events that result in: “Exposure of a member of the public leading to an effective dose in excess of 10 mSv"

The overexposure at the hospital would be rated at Level 2.