Form 231: Fill & Download for Free

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The reshimu is prior to Adam Kadmon. It is what remains after the tzimtzum harishon. When the Ohr Ein Sof — essentially the power of infinite revelation (koach ha-bli gevul) is concealed by the tzimtzum — this reveals the power of finitude (called koach hagevul). It is that koach hagevul which is the reshimu.The reshimu becomes the root of the vessels at every level after the tzimtzum, including the vessels that emerge in A"K (which is Beriah hakelali), such as the single vessel if Akudim, the 10 vessels of Nikudim (Tohu before the Breaking of the vessels) and then the vessels of Atzilut (also called Berudim and Tikkun).The reshimu is characterized as “letters” which form 231 unique two letter combinations called “gateways". See belowSince there are 22 letters in the Hebrew alphabet the calculation is 22x21=462. ÷2 = 231 to get to *unique* combinations, because אב or AB and בא or BA are regarded as the same thing for this purpose. Also we do not calculate same letters, such as אא or AA in this calculation. Hence 22x21 not 22x22.The way to think of it is this: single letters (in Hebrew) do not constitute meaningful words. The most basic combination that bears meaning is a two letter word, and more from there. Thus the letters are 'vessels' for the light (=meaning) that the word bears.

0.15 grams of protactinium deposited on a 1.5-mm diameter wire by the Van Arkel process (Bohet and Muller, 1977[1])Protactinium is interesting because of how little is known about it and because various isotopes will appear in substantial amounts in thorium nuclear fuel cycles [2]that are gaining attention recently. Here are the three isotopes of Pa with potential weapons significance:Pa-231 occurs naturally and in Th cycles, and is possibly fissilePa-232 is probably fissile (but short lived) and can be bred by neutron capture on Pa-231Pa-233 occurs in Th cycles and decays to U-233, which is fissile and has undeniable weapons applicabilityThe ability of natural protactinium (Pa-231) to fission was known in the United States well before plutonium was discovered[3].However, protactinium in nature is quite rare and we still don’t know the neutron cross sections and neutron yields of Pa-231 well enough to establish conclusively whether or not it is fissile—in effect, if it even has theoretical application as a nuclear explosive. We do know that Pa-231 is fissionable and a neutron-multiplying medium, and have known that for a long time. We also know that it is not nearly as efficient in this regard as the common nuclear explosive materials U-235, U-233, and Pu-239 (in addition to a long list of fissile exotics that, as far as is known, have seen no application). If it is fissile, then the bare-sphere critical mass lies somewhere between about a ton and infinity[4][5] [6] . It may also not be fissile. The implication here is that this is an impractical nuclear explosive at best, just on account of quantity needed for assembly.Let’s say we’ve established the potential for making a nuclear explosive from Pa-231. The engineering hurdles would be daunting:Decay heat removal (we are talking about kilowatts per ton[7])Rapid ingrowth of radon in the decay chain, making this a messy material to handleProbable need for frequent reprocessing to eliminate progeny (its daughter is a neutron poison of some significance)Low density at standard conditions compared to U, PuLarge and unpredictable potential neutron background from accessory (a,n) reactionsPhase behavior at high pressures is not understood (at least publicly)Complex neutronics: The Pa-231(n,g)Pa-232 reaction has a high cross-section and results in a Pa isotope with considerably more favorable properties with respect to fission than Pa-231, leading to the possibility of contributions to yield from Pa-232 if Pa-231 is used in a nuclear fuel / explosive.So Pa-231 is possibly fissile but not a good material for nuclear explosives. In the past, the biggest barrier to further investigation of its fission properties has surely been its scarcity in nature. But in Th fuel cycles, it is encountered in greater quantities as a synthetic from the Th-232(n,2n) fast neutron reaction, and I suspect greater attention will be given to its neutronics and criticality safety aspects in the future.Pa-232, although probably fissile, has too short of a half-life for practical applicability, with one interesting exception: formation in situ from Pa-231 (see above).Finally, Pa-233 is the parent of U-233. It is formed in large quantities in thorium reactors by neutron capture on thorium, and although not fissile, it is indisputably a nuclear proliferation issue because its daughter is a very good nuclear explosive.In conclusion, understanding protactinium is definitely important to nuclear weapons and nonproliferation.Footnotes[1] ScienceDirect[2] Thorium power has a protactinium problem - Bulletin of the Atomic Scientists[3] https://journals.aps.org/pr/pdf/10.1103/PhysRev.56.382[4] https://www.tandfonline.com/doi/abs/10.13182/NSE78-A27311[5] Nature of fission and the criticality process (from protactinium to californium and beyond) (Technical Report)[6] A re-calculation of criticality property of 231 Pa using new nuclear data[7] If we collected a metric ton of protactinium-231, how could we use it?