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#radiation

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Spaceflight 🚀

#Graphene-based nanocomposites can serve as potential #radiation ☢️ shields against ionizing radiation in the gamma and X-ray ranges, boasting a mass attenuation coefficient exceeding 0.2 cm2/g nature.com/articles/s41598-024

NatureGraphene-based nanocomposites as gamma- and X-ray radiation shield - Scientific ReportsCommonly used materials for protection against ionizing radiation (gamma and X-ray energy range) primarily rely on high-density materials, like lead, steel, or tungsten. However, these materials are heavy and often impractical for various applications, especially where weight is a key parameter, like in avionics or space technology. Here, we study the shielding properties of an alternative light material—a graphene-based composite with a relatively low density ~ 1 g/cm3. We demonstrate that the linear attenuation coefficient is energy of radiation dependent, and it is validated by the XCOM model, showing relatively good agreement. We also show that the mass attenuation coefficient for selected radiation energies is at least comparable with other known materials, exceeding the value of 0.2 cm2/g for higher energies. This study proves the usefulness of a commonly used model for predicting the attenuation of gamma and X-ray radiation for new materials. It shows a new potential candidate for shielding application.
#RadiationProtection#HumanSpaceflightHealth
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MikeDunnAuthor

Today in Labor History March 28, 1979: Three Mile Island (TMI) nuclear power plant, in Pennsylvania, had a level-5 partial meltdown, the worst nuclear power accident in U.S. history, and one of the worst in the world, prior to Chernobyl. TMI operators had not been adequately trained to handle the type of malfunction that led to the meltdown and, consequently, a delay in mitigation efforts. Clean-up began in 1993, at a cost of $2 billion in today’s dollars. Officials concluded that the release of radioactive material from the plant did not raise exposure levels of nearby residents to a level that would increase cancer cases by even one additional case. However, anti-nuclear groups hired their own independent investigators who found that radiation levels in the area were significantly elevated. A peer-reviewed study by Dr. Steven Wing found a significant increase in cancers from 1979-1985 among people living within ten miles of TMI. And in 2009, Dr. Wing said that the amount of radiation released during the accident was likely "thousands of times greater" than the NRC's estimates.

In 2024, Bill Gates obtained exclusive rights to the “carbon-free” energy from TMI, once it reopens, to power his Artificial Intelligence farms, starting in 2028. Other Tech Barons are also looking to exploit nuclear power for their energy-hungry AI farms. Data centers currently account for about 1 to 1.5 percent of global electricity use. NVIDIA will be shipping out over 1.5 million AI server units per year by 2027. These servers, alone, would consume at over 85.4 terawatt-hours of electricity annually, more than many small countries use in a year. Yet, the U.S. still has no permanent radioactive waste storage facilities. As of 2023, the U.S. had roughly 88,000 metric tons of spent nuclear fuel from commercial reactors, and all of this is stranded at the reactor sites. Experts expect this number to grow by 2,000 metric tons each year.

cnn.com/2024/09/20/energy/thre

scientificamerican.com/article

scientificamerican.com/article

A clean-up crew working to remove radioactive contamination at Three Mile Island. By John G. Kemeny et al - Report of The President's Commission on the Accident at Three Mile Island: The Need for Change: The Legacy of TMI, p. 140, Public Domain, https://commons.wikimedia.org/w/index.php?curid=7691771
#workingclass#LaborHistory#radioactive
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Asbestos

It's so tiring to see people spout off online with their half understood BS like they know what they are talking about.
Was just looking at something about radium dials on watches. Idiot after idiot was spouting off about how radium is an alpha emitter so the radiation could be stopped by a piece of paper so it's not so bad for you.
about 50% true. The problem with alpha radiation is if you get it inside you it really cooks the area. Also radium decays into other things.
#radiation #nuclear

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Asbestos

One thing to remember: When people used to put radium in all sorts of things to put on and in your body, the main reason more people did not die is that actual radium is quite expensive. If it had not been they would have actually put it in more of the products and at higher levels.
TLDR making money always wins against health and honesty
#radioactive #radiation #health #economics

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MikeDunnAuthor

Today in Labor History February 18, 1955: The U.S. launched Operation Teapot at the Nevada Nuclear Test Site. Teapot included 14 nuclear bomb tests. Wasp was the first, detonated on February 18. It had a yield of 1.2 kilotons. During shot Wasp, ground forces participated in Exercise Desert Rock VI. This included an armored task force moving to within 3,000 ft of ground zero, while the mushroom cloud was still growing. From 1945 through 1962, the U.S. conducted 230 atmospheric nuclear weapons tests, with approximately 235,000 military personnel participating. Most were enlisted men, from the navy. However, millions of people were exposed to the fallout from U.S. nuclear weapons tests in the southwest of the U.S. and the Marshall Islands. University of Arizona economist Keith Meyers estimates that radioactive fallout was responsible for 340,000 to 690,000 American deaths from 1951 to 1973.

Video image of the Teapot-MET (Military Effects Test), 22-kilotons. Shows fiery mushroom cloud. By Atomic Energy Commission/USDE - https://www.youtube.com/watch?v=XEuSXr6VaJw, Public Domain, https://commons.wikimedia.org/w/index.php?curid=141281294
#workingclass#LaborHistory#nucleartest
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