Table 2. The relationship between the random double event probability and gamma ray dose rate for a 10 micron diameter cell.

Gamma-ray dose rate (mGy y-1)	Fraction of cells per year which contain a double event
2	4.57 x 10-4
1	1.14 x 10-4
0.1	1.14 x 10-6
0.01	1.14 x 10-8
0.001	1.14 x 10-10

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