During voyages, our crews live and sleep just a few metres of their radioactive cargoes.
Because of the excellent protection provided by the transport containers, a crew members’ annual average radiation dose is 0.08mSv/year.
That figure is lower than a a return flight from the UK to Los Angeles, USA (0.11mSv/year).
It is also lower than the permitted exposure for someone at a nuclear site (1mSv/year).
Other dose comparisons from sources of exposure include:
|Source of exposure||Dose|
|Dental X-ray||0.005 mSv|
|Chest X-ray||0.02 mSv|
|135g bag of Brazil nuts||0.005 mSv|
|CT scan of the head||1.4 mSv|
|UK average annual radiation dose||2.7 mSv|
|Average annual radon dose to people in Cornwall||7.8 mSv|
While there is no requirement for routine dose measurement on PNTL ships, all crew members wear individual thermoluminescence dosemeters (TLDs), to monitor individual radiation doses whenever casks of radioactive material are on board, in line with procedures at nuclear licensed sites.