2013 Volume 62 Issue 1 Pages 19-23
In the case of the metropolitan area, radioactive substances came flying from March 15 to 16 and from March 20 to 23. We measured the radioactive substance contained in leaves using a HPGermanium semiconductor detector.
As a result of the measurement, we confirmed the following. (a)The main radioactive substance are 132Te, 131I, 134Cs, and 137Cs. (b)The 134Cs and the 137Cs were almost same quantity. (c)Radioactive concentration such as tea leaf etc. has decreased by the physical half life and the weather condition etc.