Category Archives: nuclear

A Brief History of Radioactivity

More than one hundred years ago, Henri Becquerel discovered that uranium emitted penetrating rays similar to those used by Wilhelm Röntgen to take the first X-ray image (of his wife’s hand), starting a new era of far-reaching applications. There are of course many dangers that come with the use of radioactivity, but there are also many beneficial uses for our society.

WHAT IS RADIOACTIVITY

The nucleus of an atom is made of protons and neutrons. Because protons have positive charge, they repel each other, so there must be a force that holds the nucleus together, and the neutrons don’t help, …read more

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Posted in Curated, history, nuclear, radiation, radioactivity, radioisotope, radium girls | Leave a comment

Low Background Steel — So Hot Right Now

The nuclear age changed steel, and for decades we had to pay the price for it. The first tests of the atomic bomb were a milestone in many ways, and have left a mark in history and in the surface of the Earth. The level of background radiation in the air increased, and this had an effect on the production of steel, so that steel produced since 1945 has had elevated levels of radioactivity. This can be a problem for sensitive instruments, so there was a demand for steel called low background steel, which was made before the trinity tests. …read more

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Posted in atomic bomb, background detection, Bessemer method, Blue Steel, Hackaday Columns, history, Interest, iron, nuclear, old, old tech, radioactive, radioactive decay, steel | Leave a comment

Soviet Era Smoke Detector Torn Down, Revealing Plutonium

It’s widely known that a smoke detector is a good ionizing radiation source, as they contain a small amount of americium-241, a side product of nuclear reactors. But what about other sources? [Carl Willis] got hold of an old Soviet era smoke detector and decided to tear it down and see what was inside. This, as he found out, isn’t something you should do lightly, as the one he used ended up containing an interesting mix of radioactive materials, including small amounts of plutonium-239, uranium-237, neptunium-237 and a selection of others. In true hacker fashion, he detected these with a …read more

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Posted in misc hacks, nuclear, radiation, radioactive, smoke detector, soviet, teardown, Yikes | Leave a comment

Retrotechtacular: [Walt] Builds A Family Fallout Shelter

In the 1950s it seemed likely that the Cold War could at any minute take a turn for the worse, and we might all be consumed in the fiery conflagration of nuclear war. Fortunately neither the leaders on our side of the fence nor those on the other were the dangerous unpredictable lunatics their opponent’s propaganda might have portrayed them as, and instead we continued on our way uneasily gazing at each other over the Iron Curtain.

For civilian America, the Government created a series of promotional efforts to prepare them for the effects of nuclear war and equip them …read more

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Posted in cold war, Fallout, nuclear, nuclear shelter, Retrotechtacular | Leave a comment