Occupational exposure: Veterinary workers
While medical radiation accounts for over 95 per cent of the population’s artificial radiation exposure, the occupational risk for veterinary workers is very low, with good practice. Exposures in veterinary practice can be more variable than in other occupations using ionising radiation.
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Imaging using ionising radiation is essential to veterinary practice, and due to the size differences of animals and the situations where imaging may be required, the occupational exposure issues are more varied and complex than with general medical imaging.
Many veterinary practices outsource their imaging to specialist facilities. While these have their occupational exposure challenges, good practice limits exposure.
Veterinary practices with in-house facilities or portable x-ray devices encounter varied issues that require consideration, and often more personal protective equipment (e.g. lead aprons) than a number of other occupations. For example, using portable X-ray devices to image large, mobile animals means potential exposures that are unique to veterinary workers. The desire to obtain a diagnostic image swiftly should not override workers safety.
The two main sources of exposure for veterinary workers are diagnostic X-rays and unsealed sources used in nuclear medicine. Once the equipment or source of radiation is removed, the exposure stops. External exposure in veterinary practices is very low, and with good practice should remain low. Internal exposure from X-ray equipment due to inhalation or ingestion risk is not possible. Internal exposure from unsealed sources due to inhalation and ingestion under normal conditions is unlikely.
ARPANSA has been monitoring and reporting on veterinary exposure for decades; there is a good understanding of the occupational exposure.
Most veterinary workers will receive annual occupational doses below the public limit of 1 mSv (milliseivert). If dose levels are higher than the public dose limit, then it would be advisable for the responsible person to review the work procedures.
In comparison, average background radiation exposure in Australia is 1.5 mSv per year from natural sources. Currently, Australians are exposed to an average of 1.7 mSv per year from medical exposures.
There are no provable long-term health effects at the very low doses received by veterinary workers. Many receive no occupational dose, with those that receive any typically receiving less than a small fraction of the occupational dose limits. Despite this, it is good practice to avoid or limit occupational dose where possible.
In Australia the use of irradiating apparatus and radiation sources is regulated. Each state and territory is responsible for enforcing their respective radiation safety act and regulations in their jurisdictions. The Australian government is responsible of enforcing the radiation safety act and regulations of commonwealth entities only.
Organisations/employers are responsible for:
- devising, implementing, and regularly reviewing their radiation management plan
- regulatory compliance
- induction and ongoing training of workers, including contractors.
Workers are responsible for:
- following radiation protection practices specified in the radiation management plan
- complying with legitimate instructions of the employer or designated radiation safety officer
- participate in radiation protection training.
The Australian State and Territory jurisdictions have uniform annual limits for public and occupational exposure: 1 mSv for the public and 20 mSv for workers who are occupationally exposed. Despite this, there are different definitions of who is ‘occupationally exposed’ and who should wear personal dosimeters. You can further discuss occupational radiation exposure with your facility’s Radiation Safety Officer or the relevant state or territory regulator.
For a pregnant radiation worker, the dose to the unborn child is restricted to the same as a member of the public – 1mSv. See Occupational exposure: Management of pregnant workers factsheet.