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.