By information from inhabitants of Chiba, in 2016, the
administration measured the air dose of radioactivity of "Kashiwanoha
Park ". Result was that 1m dose was around 0.15μSv/h and the value was
lower than that with decontamination by the administration being
demanded. In the same year, we measured air dose of radioactivity and
soil in several places including the measurement spot same as
administration. As a result, 1m dose was same level as administrative
measurements. But, radioactivity of 800 - 2200Bq/kg was seen in the
soil. In addition, we measured γ beam spectrum of the soil. From
gathered all soil, several peak of the artificial radiocesium were
detected. We got next conclusion. In the "Kashiwanoha Park ", the dose
of radioactivity was lowered, but, now passed for five and a half
years from Fukushima nuclear plant accident, radioactivity seemed to
remain.