You saw the answer I gave about Tokyo and I'd say the same applies as far as radiation in the air, water and on foodstuffs in Ibaraki.
Officially it's recommended you don't go within 80 kilometers of the Fukushima Daiichi plant, although the expressway and the shinkansen railway are considered safe to use. The Japanese government won't allow anyone within 20 km of the plant.
It's also suggested that you reconsider your need to travel to areas still affected by the quake and tsunami, which includes coastal areas of Ibaraki Prefecture. This is because the Japanese government wants to avoid unnecessary pressure on infrastructure and utilities rather than any immediate danger to your person.
It's up to you to decide if going is the right thing to do, you have to evaluate your own risk profile and do what you think is right... but personally I'd have no problem with being around Ibaraki. Hope your friend feels better soon.
Phil. over 7 years ago