This page covers the radioactivity section of the course. Take care not to mix units when calculating decay equations. For instance, you may encounter activities given in Becquerel’s and count rates stated in counts per minute; half lives are often quoted in reference works using the most relevant time unit, be it seconds or years.
Ernest Rutherford's famous gold foil experiment involves the scattering of [...]
Ernest Rutherford's famous gold foil experiment involves the scattering of alpha particles as they pass through a thin gold foil.
It led to a better understanding of the structure of atoms.
It's ...also known as the Geiger--Marsden experiment, after Hans Geiger and Ernest Marsden who performed it under Rutherford's supervision.
Particle physicist Bruce Kennedy explains wit this modern re-creation.[+] Show More
3 Atomic Nucleus
Cloud Chamber Alpha Particles
Very cool dry ice Alpha radiation video
Very cool dry ice Alpha radiation video
Cloud Chamber and Alpha source.
This video shows Pb210 in a Pasco cloud chamber. You can clearly see the [...]
This video shows Pb210 in a Pasco cloud chamber. You can clearly see the tracks form as the alpha particles hit the alcohol vapour "cloud" in the chamber. They are ...all very similar and linear as the particles have roughly the same energy in the splitting atom.[+] Show More
Cloud Chamber Cosmic Rays
Pb210 Source showing background alpha and neutrino, muons and other cosmic [...]
Pb210 Source showing background alpha and neutrino, muons and other cosmic rays in a cloud chamber.
Protactinium half life experiment
The background count can be determined from this video [...]
The background count can be determined from this video https://www.youtube.com/watch?v=nTHfO8daPZc Using a protactinium genrator and a gieger-muller tube, you can perform an experiment to determine the half life of a protactinium ...isotope. This video explains how the protactinium generator works and will allow you to take results in real time that will allow you to determine the decay constant and the half-life.[+] Show More
GCSE Science Revision - Carbon Dating
British Museum Gebelein Man - Oldest Mummy found in the World!
Gebelein, Egypt, Predynastic period, around 3500 BC A naturally preserved [...]
Gebelein, Egypt, Predynastic period, around 3500 BC
A naturally preserved mummy in a reconstructed pit-grave.
This man died more than five thousand years ago and was buried at the site of Gebelein, ...in Upper Egypt. The reconstruction of his grave illustrates the early Egyptian custom of placing the body in a contracted, foetal position, usually on the left side, with the head to the south, facing the west, the land of the dead where he would be reborn. Around him were all the things he might need for his afterlife, especially pottery to hold and serve food.
In the Predynastic period (4400-3100 BC), the time before the pharaohs, the dead were buried in shallow graves cut into the desert sand. The graves were often lined with reed mats, making them like a bed, and the body was covered with linen or skins and more mats, like a blanket, before the grave was refilled and perhaps topped by a mound of dirt. Contact with the hot dry sand naturally preserved the bodies because the sand absorbed the water that constitutes approximately 75% by weight of the human body. Bacteria cannot breed without moisture and as a result, the bodies frequently did not decay, but simply dried out. The body of this man is remarkably well-preserved, even down to his finger-nails and hair, which has probably faded with time.
Chance discoveries of these sand-dried mummies (for example, when a grave was disturbed by animals or robbers), may have promoted the belief that physical preservation of the body was necessary for the afterlife. This may have led the later Egyptians to develop means of artificial mummification after the introduction of coffins and deeper graves separated the body from the natural drying effects of the sand.
The objects that surrounded Gebelein Man in his original burial are unknown. On display is a selection of typical grave-goods from other graves of the middle Predynastic period (about 3500 BC), the time we believe he died. Attempts to date the body using Carbon 14 (the radiocarbon method) have so far been unsuccessful[+] Show More
Stalking the Wild Nutrino | Cosmos: A Spacetime Odyssey
The nutrino, one of the most elusive elements, takes a tremendous amount of [...]
About Cosmos: A Spacetime Odyssey: Hosted by renowned astrophysicist Neil ...deGrasse Tyson, COSMOS will explore how we discovered the laws of nature and found our coordinates in space and time. It will bring to life never-before-told stories of the heroic quest for knowledge and transport viewers to new worlds and across the universe for a vision of the cosmos on the grandest scale. COSMOS will invent new modes of scientific storytelling to reveal the grandeur of the universe and re-invent celebrated elements of the legendary original series, including the Cosmic Calendar and the Ship of the Imagination. The most profound scientific concepts will be presented with stunning clarity, uniting skepticism and wonder, and weaving rigorous science with the emotional and spiritual into a transcendent experience.
About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible.
Radiation: Penetration through different materials
A demonstration of the penetrating ability of the radiation emitted from [...]
A demonstration of the penetrating ability of the radiation emitted from three different sources: Plutonium-239, an alpha source; Strontium-90, a beta source; and Radium-226, a gamma source. The materials used ...are: Tissue; Aluminium; Lead.[+] Show More
Radioactivity--The Geiger Counter
In this lab we will investigate the measurement of radioactivity using a [...]
In this lab we will investigate the measurement of radioactivity using a Geiger counter.
Explanation of nuclear decay series. LeanThink.org [...]
When you read about the ages of certain ancient artifacts, or even the age [...]
When you read about the ages of certain ancient artifacts, or even the age of the earth itself, how do we know such numbers? How can we know that a ...fossil is precisely 250 million years old? The key technique here is radiometric dating. This is where we use our understanding of radioactive decay to measure the age of an object. How does this work, you ask? Watch and find out!
In this episode of Keipert Labs, we'll explore the different techniques [...]
In this episode of Keipert Labs, we'll explore the different techniques that we can use to detect radiation. We'll look at radiation badges, Geiger counter, scintillation counter and the cloud ...chamber. Tune in to find out more![+] Show More
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