Depth Distribution Measurement Results of Radioactive Substances Found at Namie Town, Kawamata Town, and Other Places in Northern Japan Using a Soil Sampler of Large Diameter (From February 2012 to March 2012) Depth Distribution Measurement Results of Radioactive Substances Found at Namie Town, Kawamata Town, and Other Places in Northern Japan Using a Soil Sampler of Large Diameter (From February 2012 to March 2012)