Anyways, a 2.13 mg sample of ash, 3 particles selected at random, comprising between 95.6 to 95.9 % of the mass of the sample, totally digested in nitric acid, returned a result of 99.3% Ni62. So that is not a surface effect.
Nope. it's a "salting" effect. Rossi simply purchased Ni62 and added it to the sample either before or after the experimental run. The "blind mice" professors, by allowing him to handle the "fuel" and "ash" gave him every opportunity. Only the mildest sleight of hand technique, if any, was required.