Posted By Bob Youel Having extensive experience re nuclear I note that; COSHH is easier to manage than industrial radiation hence the differing standards at this time as its almost impossible to work to a 'practicable' standard re radiation exposure in the 'real' world in some situations In some of the older reactors the controls were ???! to say the least - some old designs make installing temp shield walling without getting high doses impossible and some of the permanent installiations were not shielded at all Thankfully the industry has changed and the 'old' ways of working are controlled better that they were