Ciro Santilli @cirosantilli 40

superuser.com/questions/420885/is-there-a-face-recognition-command-line-tool/1852394#1852394 played with the face_recognition Python package: github.com/ageitgey/face_recognition Cute CLI API, but disappointing accuracy. Also at:

Thanks Adam Geitgey for putting that repo up.

Announcements:

Under Section "Publication by Marie Curie" I did a quick overview of the papers in which Marie Curie and collaborators publish the existence of new elements polonium and radium. Both are very understandable (except the chemistry), and have some cute terminology. I also cited those papers on her Wikipedia page: en.wikipedia.org/w/index.php?title=Marie_Curie&diff=1240252528&oldid=1238097626 Another good exercise in "old paper finding" + "Wikipedia markup/rules" as I looked at the Comptes rendus de l'Académie des Sciences a bit.

This was kickstarted by YouTube recommending me the following good video:

which led me into yet a quick nuclear physics binge. I shouldn't do this to myself. I also ended up writing some tentative answers on Quora:

Announcements:

The following cobalt-60 diagrams suggest that some lines are clearly visible in specific nuclear reactions:

Also this one:

They are stopped by:Therefore, alpha emitters are not too dangerous unless ingested.

This one contains a PDF with OCR: archive.org/details/ComptesRendusAcademieDesSciences0127/page/n5/mode/2up

Gun-type fission weapons don't work with Plutonium-239 because of the presence of Plutonium-240 as an impurity which leads to fizzle.

Good mentions at: youtu.be/dgBDvnqMkT4?t=252

A nuclear reactor made to produce specific isotopes rather than just consume fissile material to produce electrical power. The most notably application being to produce Plutonium-239 for nuclear weapons from Uranium-238 being irradiated from Uranium-235-created fission.

Because you can generate plutonium-239 from uranium-238 in a breeder reactor, and then separate the plutonium-239 from the Uranium simply by using chemistry methods because you've created an element with different valence electrons.

Isn't it somewhat funny that it is easier to purify a synthetic element than a naturally occurring one?

This isotope shows up as an inevitable contaminant in Plutonium-239 for nuclear weapons, because it emits neutrons too fast and makes it harder to assemble the critical mass without fizzle.

It is the presence of this contaminant that made implosion-type fission weapon a necessity: Section "Gun-type fission weapons don't work with plutonium".

Wikipedia explains that Pu-240 is formed by Pu-239 Neutron capture:so its presence is inevitable.

This is the isotope that is produced for nuclear weapons by irradiating Uranium-238 with a neutron.

Plutonium-240 is a contaminant.