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Gamma radiation is electromagnetic, so there’s nothing to see there, so to speak.

Really?!?

Using the traditional, well-established equations for this nuclear reaction, Rossi's E-Cat ought to be putting out enough gamma radiation to kill everyone in the room in a matter of hours, or even minutes. And, the amount of lead shielding he claims to be using is totally inadequate to stop those gamma rays.

Rossi himself claims that his device works by "unknown nuclear reactions" (from his patent application), so he can't explain how it works, or how safe or unsafe it is.

If his device really is a nuclear reactor (as Rossi claims) and no one, including Rossi, understands how it works, it is reckless to allow them to be sold as though they are ordinary boilers. In the U.S., at least, you can't even sell ordinary 1MW boilers without government permits.

Of course, if Rossi's device doesn't really do what Rossi claims, then there is no reason he would be worried about getting certification for his "Mr. Fusion".

Using the traditional, well-established equations for this nuclear reaction, Rossi's E-Cat ought to be putting out enough gamma radiation to kill everyone in the room in a matter of hours, or even minutes.

You didn't see the video!

In conventional reactions the energy is released in one large bang. Think of a rock falling through air to a concrete sidewalk. The rock hits the sidewalk in one large bang. Now in Rossi's ~~contraption~~ reactor, it is more like a rock falling through water. Energy is released slowing as the rock falls so there is no hard gamma. Only soft gammas which are easily shielded.

Rossi himself claims that his device works by "unknown nuclear reactions" (from his patent application), so he can't explain how it works, or how safe or unsafe it is.

You don't necessarily need to understand the details. You need to put gamma, X-ray, and neutron detectors around it and see if they detect anything. Keep it up for a month. If nothing, then you can have at least some small degree of confidence that it's not emitting dangerous radiation.

"Using the traditional, well-established equations for this nuclear reaction, Rossi's E-Cat ought to be putting out enough gamma radiation to kill everyone in the room in a matter of hours, or even minutes. And, the amount of lead shielding he claims to be using is totally inadequate to stop those gamma rays."

It's fairly obvious from MANY experiments (not just Rossi) that CF doesn't follow the "traditional, well-established equations for this nuclear reaction". And since I've not seen any information on what the gamma spectrum of the E-Cat looks like as far as gamma energy, I know darned well you have no way to tell whether "the amount of lead shielding he claims is totally inadequate to stop those gamma rays". Rossi says "weak gammas" on the same energy order as x-rays., which don't take a gigantic amount of shielding.

Note....part of my grad school background is in nuclear science, so I have actually done shielding calculations (one of my courses was "Introduction to Nuclear Engineering", which had a section of shielding design and calculations), and know what is involved.

Nothing for the NRC to regulate, I mean. Silly me, I presumed that the machine would come with shielding.