hi moon..
I haven’t a clue since I haven’t been inside an e-cat; however, since the LENR, which have been published all seem to have low, very low or immeasurable radiation - it would seem to be a good candidate.
Rossi indicated low radiation, which is easily stopped by the lead shielding covering the e-cat.
I don’t believe anyone can say with certainty except those on the inside of NDAs and obviously they are not talking.
Lurking’
LENR seems to rely on “heavy electrons” and the capture of the heavy electron by a proton. In Rossi’s patent application, he mentions fusion, fission, and beta decay, but nothing that could be construed as LENR, if my understanding of LENR is correct.