Table 3 Radioactivity and concentrations of target isotopes in the drain water and ratios of them to ¹³⁷Cs for the measured and calculated for Unit 1 core.

Isotopes	Concentration (Bq/ml)	Radioactivity ratio to ¹³⁷Cs	Concentration (mol/ml)	Mole ratio to ¹³⁷Cs	Mole ratio to ¹³⁷Cs in Unit1 core (ORIGEN)	Ratios of drain water to Unit1 core ratios
⁹⁰Sr	55 ± 5	9.3 × 10⁻⁴	1.2 × 10⁻¹³	8.5 × 10⁻⁴	0.71	1.2 × 10⁻³
⁹⁵Mo	−	−	2.9 × 10⁻¹³	2.1 × 10⁻³	0.87	2.4 × 10⁻³
⁹⁶Mo	−	−	3.4 × 10⁻¹⁴	2.4 × 10⁻⁴	0.04	5.6 × 10⁻³
⁹⁷Mo	−	−	3.3 × 10⁻¹³	2.3 × 10⁻³	0.97	2.4 × 10⁻³
⁹⁸Mo	−	−	3.4 × 10⁻¹³	2.5 × 10⁻³	0.99	2.5 × 10⁻³
¹⁰⁰Mo	−	−	3.5 × 10⁻¹³	2.5 × 10⁻³	1.1	2.3 × 10⁻³
Total Mo	−	−	1.3 × 10⁻¹²	9.6 × 10⁻³	4.0	2.4 × 10⁻³
⁹⁹Tc	N.D	−	N.D	−	7.0	−
¹²⁵Sb	1.5 × 10²	2.5 × 10⁻³	3.3 × 10⁻¹⁴	2.4 × 10⁻⁴	0.0049	4.8 × 10⁻²
¹²⁹I	0.14 ± 0.01	2.4 × 10^v7	1.6 × 10⁻¹⁰	1.2	0.16	7.4
¹³⁴Cs	(5.1 ± 0.02) × 10⁴	0.86 ± 0.01	8.0 × 10⁻¹²	5.7 × 10⁻²	0.065	8.9 × 10⁻¹
¹³⁷Cs	(5.9 ± 0.007) × 10⁴	1	1.4 × 10⁻¹⁰	1.0	1.0	1.0
¹⁵²Eu	N.D	−	N.D	−	2.3 × 10⁻¹⁴	−
¹⁵⁴Eu	N.D	−	N.D	−	0.012	−
²³⁸U	N.D	−	N.D	−	597	−
²⁴¹Am	N.D	−	N.D	−	0.040	−
²³⁹Pu	N.D	−	N.D	−	2.8	−

※The concentrations were decay-corrected to the time of the accident, March 11, 2011.

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