Remember that it was not a presidential election year, so those turnout numbers are always slightly depressed. But, I believe that I read that for a non-presidential election year, turnout was pretty robust in AK, something around 50%.
Wonder if the turnout was really higher or if the rumors of ballot stuffing by the Murkowski camp are true. If he Republican establisment in AK and the Rats were working together, this becomes quite plausible.