Progress in Earth and Planetary Science

Table 2 Curve fitting results with assumed ⁸⁹Sr over ⁹⁰Sr activity ratio

From: Atmospheric radioactivity over Tsukuba, Japan: a summary of three years of observations after the FDNPP accident

March 14–15, 2011		March 20–21, 2011
⁸⁹Sr:⁹⁰Sr	σ	⁸⁹Sr:⁹⁰Sr	σ
9:0.14	0.3356	8:0.14	0.4550
10:0.14	0.3340	9:0.14	0.4165
11:0.14	0.3493	10:0.14	0.5432
12:0.14.	0.3795	11:0.14	0.5869

The results for two air filter samples collected in March 2011. The minimum standard deviation σ suggests the best estimate

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