Storms wrote:
QuoteThe background helium in the atmosphere is not an issue because the systems are tight. Great efforts are made to make sure no atmospheric He enters.
Sometimes great efforts are not enough. Which is why Miles had to shut down the experiment to correct leaks *after* great efforts had been made. Leaks happen.
QuoteIf air leaks in, its presence is noted by measuring the Ar content of the gas.
There's a reason helium is used for leak testing vacuums. It's covalent size is more than 3 times smaller than that of argon, so argon is not a good control.
In any case, there was a background of helium from the atmosphere in Miles' measurements. In the metal flask measurements, he measured a background of about 5 ppb in the cells, and found 8 ppb signal (3 above noise), all compared to atmospheric background a thousand times higher at 5 ppm.
QuoteThe skeptics seem to think only they realize the effect of an air leak and only they would make sure the systems were tight. The measurements are being made by professional scientists in modern labs, not by high kids in their garage.
I don't think the world is gonna accept claims of cold fusion from scientists just because they're professional and in modern labs. No one is infallible.
Claims of polywater were made by professional scientists in modern labs, and published in Science and Nature. And even though they probably thought of impurities and did their best to exclude them, in the end, they were wrong. The observations were later attributed to impurities.
Moreover, two of the main figures in the helium research -- Miles and McKubre -- admit helium background is a potential problem:
Miles: "The production of helium-4 in these experiments is a very difficult concept to prove since there is always the possibility of atmospheric helium contamination. More studies reporting helium-4 production will likely be required before our helium results become convincing to most scientists."
McKubre: "we cannot rule out the possibility that He-4 was sourced ... or that the measured helium represents a hold-over from helium previously dissolved in D2O or PTFE.... Definitive statements will be difficult to make about 4He production in this or future experiments unless or until it is measured at several times the ambient background level."