Table 1 Averaged 1-m dose by dosimeter, observed brightness measured with the ETCC in the sky and ground, and their ratios, corrected for the difference in the solid angles of sky/ground ~1/5.7, in the locations (A), (B), and (C).

From: First On-Site True Gamma-Ray Imaging-Spectroscopy of Contamination near Fukushima Plant

 

(A) Decontaminated pavement and not-decontaminated bush

(B) Not-decontaminated ground

(C) Decontaminated parking lot

averaged dose [μSv/h]

2.2

5.2

1.8

gammas from sky [counts]

776

1591

432

gammas from ground [counts]

4611

10163

2546

solid-angle-corrected sky/ground ratio of gamma

0.96

0.96

0.89

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