Chemistry | Nuclear Chemistry. Traditional chemical reactions occur as a result of the interaction between valence electrons around an atom's nucleus (see our Chemical Reactions module for more information). In 1896, Henri Becquerel expanded the field of chemistry to include nuclear changes when he discovered that uranium emitted radiation. Soon after Becquerel's discovery, Marie Sklodowska Curie began studying radioactivity and completed much of the pioneering work on nuclear changes.
Curie found that radiation was proportional to the amount of radioactive element present, and she proposed that radiation was a property of atoms (as opposed to a chemical property of a compound). Marie Curie was the first woman to win a Nobel Prize and the first person to win two (the first, shared with her husband Pierre and Becquerel for discovering radioactivity; the second for discovering the radioactive elements radium and polonium). to top Radiation and nuclear reactions Comprehension Checkpoint Half-life.
Radioactive decay | Chemistry. Balancing Nuclear Equations. Marsh-whole.pdf. So what IS the Higgs boson? Where the Higgs -- or 'God particle' -- was found. The Large Hadron Collider is located at CERN, the European Organization for Nuclear Research, near Geneva, Switzerland. This is CERN's Globe of Science and Innovation, which hosts a small museum about particle physics inside. The ATLAS experiment is housed underground nearby. The Higgs boson, the elusive particle that scientists had hoped to find for decades, was detected by two general-purpose experiments at the Large Hadron Collider, as scientists announced in 2012.
The Compact Muon Solenoid (CMS) experiment, pictured, is one of them. The ATLAS experiment, seen here in 2011, also detected the Higgs boson, a particle that helps explain why matter has mass. Much of three stories of electronics at CMS are involved in making split-second decisions about what data to keep and what to discard. A technician works on the CMS experiment. CMS is adding this layer for the next run of particle collisions to improve the detection of muons, which are fundamental particles. Making it better "OK. Why? Strong Interaction: The Four Fundamental Forces of Physics #1a. Strong Interaction: The Four Fundamental Forces of Physics #1b. How nuclear energy works. Revisiting Chernobyl: A Nuclear Disaster Site of Epic Proportions | PBS NewsHour | March 29, 2011. GWEN IFILL: The nuclear crisis in Japan immediately brought back memories of the meltdown at Chernobyl, which still ranks as the world’s worst nuclear accident.
Nearly 25 years later, NewsHour science correspondent Miles O’Brien returned last week to see what life is like there now. MILES O’BRIEN: For an infamous ghost town of epic proportions, Chernobyl sure is a busy place. Past the guards, through the gates, and into this time capsule of the life Soviet, you must first find your way to the exclusion zone office, where the phone does not stop ringing these days. Marina Polyakova tells me it’s mostly reporters calling, wanting to visit since the meltdown at Fukushima. What am I paying for here? WOMAN: That’s for the entrance. MILES O’BRIEN: Paying the entrance fee, I remember many Ukrainians who would like to open the place to tourists, a macabre theme park, to be sure.
Do you think tourists would come here? No offense taken, I guess. ROBERT MACNEIL, former PBS anchor: Good evening. Backgrounder on the Three Mile Island Accident. Printable Version (does not include Animated Diagram of the Sequence of Events)Three Mile Island History (Video) On this page: The Three Mile Island Unit 2 (TMI-2) reactor, near Middletown, Pa., partially melted down on March 28, 1979. This was the most serious accident in U.S. commercial nuclear power plant operating history, although its small radioactive releases had no detectable health effects on plant workers or the public. Its aftermath brought about sweeping changes involving emergency response planning, reactor operator training, human factors engineering, radiation protection, and many other areas of nuclear power plant operations. It also caused the NRC to tighten and heighten its regulatory oversight.
All of these changes significantly enhanced U.S. reactor safety. A combination of equipment malfunctions, design-related problems and worker errors led to TMI-2's partial meltdown and very small off-site releases of radioactivity. Summary of Events Health Effects Current Status. Inviting Disaster - Pennsylvania Nuclear Power Station Meltdown. Meltdown-Proof Nukes. FORTY YEARS AGO the U.S. government declared war on cancer by announcing a major push to boost federal funding and coordinate research through the National Cancer Institute (NCI). For the first two decades progress was slow, but since the early 1990s, better screening tests for colorectal, prostate, and breast cancer have led to early detection and contributed to better survival rates. The latest NCI statistics, in fact, show that U.S. mortality rates for 14 of the 19 most deadly cancers declined from 2003 to 2007.
Lung cancer is among them; after years of falling death rates in men, women are registering lower numbers for the first time. Along with the good news come more sobering statistics. Cancers without reliable screening tests—such as pancreatic, liver, and uterine—or effective treatments still have rising death rates. About a third of U.S. cancer deaths are still linked to tobacco, although the number of smokers in the country is down. The Three Types of Radioactive Decay. As of July 1, 2013 ThinkQuest has been discontinued. We would like to thank everyone for being a part of the ThinkQuest global community: Students - For your limitless creativity and innovation, which inspires us all. Teachers - For your passion in guiding students on their quest. Partners - For your unwavering support and evangelism. Parents - For supporting the use of technology not only as an instrument of learning, but as a means of creating knowledge.
We encourage everyone to continue to “Think, Create and Collaborate,” unleashing the power of technology to teach, share, and inspire. Best wishes, The Oracle Education Foundation. Animation - Radioactive Decay. Calculate Your Radiation Dose | Radiation Protection.