Company officials told reporters that the radiation level near the plant's gate 1 kilometer west of the reactors was up to 1,932 microsieverts per hour at 6:30 PM on Monday.
By midnight, the figure had dropped to 331.8, and by 10 AM on Tuesday, it was down to 260.2 microsieverts per hour.
Normal in the US is less than 0.71 microsieverts per hour.
Read more at NHK World here.
