Abstract
Phosphorus-32 produced by the 35 Cl( n, α) 32 P reaction in table salt and KCl was measured to estimate the fast neutron flux from the JCO criticality accident. A directional dependence of the fast neutron flux was suggested by the anomalously low activities of samples collected from the south and south-west directions. Although the present data are preliminary, the total number of fast neutrons from the precipitation vessel is estimated to have been approximately 5×10 16 using both the 32 P activity at 70 m and the observed attenuation constant (0.006 m −1).
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