Did you calibrate those tools before and after doing the work? it is the nuclear way.
A little off topic but I was the one who created the pre and post verification (calibration) process for critical or high rad work. The instrument would be tested before use (prever) at test points the user would be measuring then when work completed, the instrument would be post verified at the same points. This 'bracketing' of work ensured that should the instrument later be found out of tolerance, the critical use job would not be impacted.