Frequently used SI multiples are the

millisievert (1 mSv = 10−3 Sv = 0.001 Sv)

and

microsievert (1 μSv = 10−6 Sv = 0.000001 Sv).

I am sure that the report said mSV and not uSv and the reporter just "made a mistake" and said microsievert because he didn't have a u symbol on his keyboard, just like me!