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Louis Slotin, a brilliant Canadian physicist and Manhattan Project veteran, had taken part in some of the most sensitive atomic research of World War II. But by 1946, with the war over, Slotin was preparing to leave Los Alamos and return to academia.

First, though, he performed one last experiment, a criticality test on a 14-pound plutonium core, the same core previously involved in another fatal accident just months earlier.

Dubbed “tickling the dragon’s tail” by those who understood the danger, the experiment involved delicately bringing two beryllium hemispheres close around the core to observe neutron reflection, edging the core toward critical mass without tipping it over.

1 posted on 06/29/2025 6:16:51 PM PDT by Az Joe
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To: Az Joe
“When his hand slipped for just a moment, the hemispheres fully
encased the core, and it went critical. A sudden blue flash of
Cherenkov radiation lit up the lab. Slotin immediately pried the
hemispheres apart with his bare hands, ending the reaction and saving
the others, but at the cost of his own life.”

This guy’s Momma never told him not to play with plutonium…

2 posted on 06/29/2025 6:29:22 PM PDT by GaltAdonis
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To: Az Joe

Such a brilliant man killed by an act of stupidity. What was he thinking, using a flathead screwdriver to keep the core halves separated?


3 posted on 06/29/2025 6:31:47 PM PDT by Ciaphas Cain
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To: Az Joe
Louis Slotin, a brilliant Canadian physicist...

It appears the article refutes that assertion.

Maybe: Louis Slotin a bullheaded, situational moron from backward yokel Canaduh....

4 posted on 06/29/2025 6:32:00 PM PDT by Navy Patriot (President Trump Decisively Won Popular & E.C., Celebrate Recivilization!)
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To: Az Joe

One of the few, who actually died of radiation.
Radiation is actually quite safe, but Slotin got like 10 Sv.
Definitely too much. But his colleagues, who were just few feet away all survived.
Unfortunately, few accidents like this generate the anti-radiation hysteria, we are all experiencing.
A lot more people die falling from ladders every year than all people died of radiation, ever!


5 posted on 06/29/2025 6:34:28 PM PDT by AZJeep (sane )
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To: Az Joe

This is the origin of the expression “FAFO”.


6 posted on 06/29/2025 6:35:57 PM PDT by bigbob (Yes. We ARE going back)
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To: Az Joe
I read about this accident for the first time when I was in seventh grade. It was in an anthology of "Exciting Stories of Science," and was told in a somewhat distorted way that undoubtedly was the result of key aspects not having been de-classified yet (I was in seventh grade from 1967-68, and the book was probably five or six years old at that time). For instance, Dr. Slotin's name wasn't mentioned, and although the fact that he was using a screwdriver was mentioned, it was said that he was holding parts of the core apart with the screwdriver, not parts of a neutron reflector.

But I read it with fascinated horror, as it described the utter breakdown of his cells, skin, blood, heart, etc., as a result of the powerful blast of gamma rays and neutrons. The blue flash was also mentioned, but I thought the blue flash was in the air; I didn't realize it's source was Cherenkov radiation within his eyeballs.

Also in that book was the story of George Franklin Smith, who was the first man to eject from an airplane going faster than the speed of sound (an F-100 Super Saber) in 1955.

Another story in the book was about the search for the cause of Hodgkin's disease, which was described as "cancer of the blood." I thought this was amazing and frightful, and I wanted to work on medical research as a result of reading the book.

7 posted on 06/29/2025 6:40:26 PM PDT by Steely Tom ([Voter Fraud] == [Civil War])
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To: Az Joe
Those crazy Rockefeller smarties... always tickling something

https://resource.rockarch.org/story/the-atomic-bomb-development-rockefeller-foundation-role/

https://dimes.rockarch.org/objects/dnSnsjCMYKjdLLZyE6cDTe/view holds over 1000 pages reporting on their activities between 1947 and 1950 a person can view on line.

8 posted on 06/29/2025 6:48:53 PM PDT by MurrietaMadman (The Gates of hell shall not prevail against you)
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To: Az Joe

I suspect there are videos floating about on YouTube that depict a simulated version of what that plutonium incident looked and sounded like. There was so much the world didn’t know about radiation until later in the 20th Century.

This horrible tale is almost as horrible as when I read about
The Philadelphia Experiment of 1943. Most now say the worst stories are a hoax. The conjecture that sailors absorbed so much radiation that their bodies began the process of dissolving and then fusing with the surfaces of their ship.
I read about it, and later heard about it on several Art Bell radio shows. Jury is still out.


9 posted on 06/29/2025 7:00:48 PM PDT by lee martell
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To: Az Joe

I am getting pretty old now myself and I don’t know how much longer The. Almighty will allow me.

Somebody needs to check this out.

In 1983 I was working at Downey, CA on classified programs.

I was chatting with one of our North American veterans who was way past retirement age but still working.

He suddenly commented, “I am the last one alive. I need to tell someone “.

What?

He told the story:

“In 1949 we had a small reactor which was funded by military. Suddenly, they cut the funding. Management told us to get rid of it. Of course, the project was classified so few knew it existed. We took the reactor out on a Saturday night, dug a hole under the runway and covered it with concrete”.

This was at the old Rockwell North American plant in Downey. They used to fly out the aircraft they built there in WWII. It is at the corner of Lakewood and Stewart&Gray if I remember correctly.

The runway was in the middle and ran diagonal.

I heard they turned it into a car lot.

Somebody needs to find that reactor before it hits the ground water.

You will not find this incident in history books or on the internet. I suspect I am the only one alive who knows the story.


10 posted on 06/29/2025 7:02:52 PM PDT by darth
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To: Az Joe

I worked in radiation effects for over 20 years. Some facilities were capable of producing 1200 Rads/sec. I had two 50’s vintage x-ray machines in my lab (real frankenstein stuff) and had less than 20 mrem on my personal dosimeters in all that time.

It’s just careful planning and procedure. A scientist is not a test pioly.


23 posted on 06/29/2025 7:40:50 PM PDT by Tijeras_Slim
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To: Az Joe

Slotin was actually the second person to be killed by a mishap with this core. The first was a man named Harry Daghlian.

https://en.wikipedia.org/wiki/Demon_core


24 posted on 06/29/2025 7:41:05 PM PDT by Coronal
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To: Az Joe

There was a previous criticality incident with the “Demon core” on August 21, 1945 Harry Dahlian was messing with the core and induced an energy excursion killing himself and injuring others. After the Slotin excursion the core was melted down and used in other weapons.


37 posted on 06/29/2025 8:33:22 PM PDT by VTenigma (Conspiracy theory is the new "spoiler alert")
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To: Az Joe

How come WE never got to play with good stuff like this in High School? Only thing WE did was play with mercury rolling around in our hands and even tasting it!


46 posted on 06/30/2025 6:31:49 AM PDT by Ruy Dias de Bivar ( )
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