106 questions · 54 sources · 0 syntheses
Radioactivity and Radioactive Decay
The spontaneous emission of radiation from unstable nuclei.
Source-derived questions
Questions extracted from the papers in this topic, excluding the curated questions above.
- How did Edwin McMillan discover neptunium by bombarding uranium with neutrons?
- How did Fermi's slow-neutron findings become foundational to the design of the first nuclear reactor?
- How did Frederick Reines and Clyde Cowan manage to detect a particle that barely interacts with anything?
- How did Harold Urey use evaporating liquid hydrogen to concentrate a heavier isotope?
- How did Henri Becquerel discover radioactivity while trying to test something else entirely?
- How did Irène Joliot-Curie's Nobel Prize connect to her mother Marie Curie's earlier work on radioactivity?
- How did Lefkowitz isolate and clone the adrenaline receptor using radioactive tracers?
- How did Marie Curie's death the year before shape the significance of her daughter's prize?
- How did Pierre Curie die on 19 April 1906?
- How did Reines and Cowan's liquid-scintillator detector confirm antineutrinos near the Savannah River reactor in 1956?
- How did bombarding beryllium with alpha particles reveal a new subatomic particle?
- How did evaporating liquid hydrogen repeatedly allow Urey to concentrate the heavier isotope enough to detect it?
Show 94 more questions
- How did the French Academy of Sciences respond to Curie's candidacy in the same year she won the Chemistry Nobel?
- How did the United States detect that the Soviet Union had tested a nuclear weapon?
- How did the control rods let Fermi start and stop a self-sustaining chain reaction on demand?
- How did the discovery of the neutron eventually make nuclear fission possible?
- How did the energy balance of ejected protons reveal that a neutral, proton-mass particle was responsible?
- How did the isotope concept explain the bewildering variety of lead produced by uranium ore decay chains?
- How did the radium standard Curie produced come to define the international unit for measuring radioactivity?
- How did the release of 'The China Syndrome' affect public perception of the accident?
- How did von Neumann react to learning that Klaus Fuchs had passed bomb designs to Moscow?
- How does Rutherford's demonstrated transmutation of elements compare to the alchemists' historical dream of transmutation?
- How does a radioactive isotope let scientists track a molecule's path through a living plant or a human bloodstream?
- How does a single neutron striking a nucleus lead to a runaway multiplication of reactions?
- How does a staged thermonuclear design use a fission explosion to ignite a secondary fusion stage?
- How does the gas-filled tube in a Geiger counter turn a single alpha particle into a measurable electrical pulse?
- How large an area of the Pacific did Castle Bravo's radioactive fallout contaminate, and who was affected?
- How long did Calder Hall operate, and how did that compare to its intended design life?
- How long did the Obninsk reactor operate before it was shut down, and what type of reactor design did it use?
- How many more years did Marie Curie continue their radioactivity research alone after Pierre died?
- How many years passed between Rutherford's prediction of the neutron and Chadwick's experimental discovery of it?
- How much power did the Obninsk reactor supply when it connected to the Soviet grid in 1954, and how many homes could that light?
- How much raw ore did the Curies have to process to isolate just one gram of radium?
- How much time passed between the Trinity test and the bombings of Hiroshima and Nagasaki?
- How powerful was the Trinity detonation compared to conventional explosives, and how far did its effects reach?
- How quickly did the Soviet Union respond with its own thermonuclear test after Ivy Mike?
- What anomaly did Soddy notice in radioactive decay products that behaved chemically like known elements but had different atomic masses?
- What arithmetic problem with atomic mass and atomic number led Rutherford to propose a neutral nuclear particle?
- What caused the aplastic anaemia that killed Marie Curie in 1934?
- What clue in lead samples from different radioactive decay chains hinted at isotopes before the term existed?
- What clue told Marie Curie that pitchblende contained an undiscovered radioactive element?
- What design flaw in the RBMK reactor allowed power to surge to roughly a hundred times its rated output in a fraction of a second?
- What did Chirac do the following year that suggested the international objections had been heard?
- What did Frederick Soddy discover while studying radioactive transmutation with Ernest Rutherford?
- What did Hahn and Strassmann find when they bombarded uranium with slow neutrons that made no chemical sense at first?
- What did Oppenheimer and Kenneth Bainbridge each say in the moments after the detonation, and how did their reactions differ?
- What did Pauling's 1958 petition to the United Nations demand, and how many scientists signed it?
- What did Rutherford demonstrate about how radioactive elements transform into other elements?
- What did William Bragg's ionisation spectrometer let the pair measure that earlier diffraction images could not show precisely?
- What did colleagues suspect caused von Neumann's fatal bone cancer?
- What did the 1963 Partial Nuclear Test Ban Treaty actually prohibit?
- What did the Curies have to do, physically, to prove radioactivity came from inside the atom rather than a chemical reaction?
- What factors let the Soviet nuclear program reach this milestone faster than American analysts expected?
- What happened on 17 October 1956 when Queen Elizabeth II connected Calder Hall to the UK National Grid?
- What happened to the crew of the fishing vessel Lucky Dragon No. 5 after Castle Bravo's fallout reached them?
- What is exponential decay, and what other natural phenomena does it also describe?
- What is the half-life of carbon-14, and how is it used to calculate the age of organic remains?
- What is the half-life of carbon-14, and why does that particular number make it useful for dating human history?
- What is trinitite, and why is the ground at the Trinity site still radioactive today?
- What later applications did radium's isolation make possible?
- What later technologies depended on the discovery of the neutron?
- What later technologies, for better and worse, became possible once the neutron was understood?
- What long-term effect did Three Mile Island have on new nuclear plant orders in the US?
- What made Marie Curie the only person to win Nobel Prizes in two different sciences?
- What position did Marie Curie take over at the Sorbonne after Pierre's death?
- What problem in the periodic table led Frederick Soddy to propose the concept of isotopes?
- What process did Marie Curie use to isolate pure radium metal from tonnes of pitchblende residue?
- What propaganda contrast did Soviet engineers draw between Obninsk's civilian power and the American Castle Bravo test in the same year?
- What result from the Joliot-Curies' beryllium experiment tipped Chadwick off that gamma rays weren't the real explanation?
- What second Nobel Prize did Pauling win in 1962, and why did it make him unique among laureates?
- What share of global electricity today is generated by the same nuclear physics Obninsk first proved out?
- What share of the world's electricity does nuclear power generate today, decades after Chicago Pile-1?
- What technologies trace their origin back to the first controlled nuclear reaction in 1932?
- What was the Chernobyl safety test on the night of 25-26 April 1986 actually trying to verify?
- What was the yield of RDS-1 compared to the bomb dropped on Nagasaki?
- What working conditions did Marie and Pierre Curie endure while isolating radium?
- Where and how did Otto Hahn learn he had won the Nobel Prize, and what else happened during that same internment?
- Where did Ramsay find helium before he found it in the atmosphere?
- Which noble gas was still missing from the periodic table in 1904, and when did it turn up?
- Why are Marie Curie's personal notebooks still too radioactive to handle without protection nearly a century later?
- Why are X-rays poor at detecting light elements like hydrogen inside a crystal, and how do neutrons get around that blind spot?
- Why can a neutron enter an atomic nucleus more easily than a proton can?
- Why did Calder Hall's Magnox reactors serve both civilian electricity and Britain's weapons programme at the same time?
- Why did Elugelab Island disappear entirely after the Ivy Mike test?
- Why did Hershey and Chase label phage DNA with radioactive phosphorus and protein with radioactive sulphur?
- Why did Jacques Chirac receive the Ig Nobel Peace Prize for resuming nuclear testing at Mururoa Atoll?
- Why did Rutherford predict as early as 1920 that the nucleus must contain a neutral particle?
- Why did Victor Hess expect ionising radiation to fade with altitude, and what did he find instead?
- Why did it take roughly forty years between Shull and Brockhouse's foundational experiments and their Nobel Prize?
- Why did neptunium-238 need to decay before plutonium could be identified?
- Why did scientists before 1912 assume that atmospheric ionizing radiation came from the ground rather than from space?
- Why did slowing down neutrons with paraffin or water make them more effective at triggering nuclear reactions?
- Why did the Castle Bravo test yield three times more explosive power than its designers calculated?
- Why did the Geiger counter make it possible to observe radioactive decay as discrete quantum events rather than bulk averages?
- Why did the Nobel committee split the 1903 physics prize between Becquerel and the Curies rather than award it to one party?
- Why do isotopes of the same element share chemical behavior despite having different atomic weights?
- Why does francium's short half-life mean only a tiny amount ever exists on Earth at once?
- Why does heavy water moderate neutrons in a nuclear reactor without absorbing them the way ordinary hydrogen does?
- Why is hafnium so effective at absorbing neutrons, and how did that property make it useful in nuclear reactors?
- Why is heavy water useful as a neutron moderator in nuclear reactors?
- Why is lawrencium's longest-lived isotope's half-life of about eleven hours significant for how much of the element can exist at any time?
- Why was a disused squash court under Stagg Field chosen as the site for the first nuclear reactor?
- Why was it chemically impossible to separate radium D from lead, and how did that failure lead de Hevesy to isotope tracing?
- Why was it significant that Curie won a second Nobel Prize in a different scientific field than her first?
- Why was the Ivy Mike device impractical to deploy as an actual weapon?
- Why would a neutral particle be immune to the Coulomb repulsion that made packing protons together difficult?
Sources
- Calder Hall — first nuclear power station to deliver commercial electricity
- Castle Bravo thermonuclear test
- Chernobyl nuclear disaster
- Death of John von Neumann
- Death of Marie Curie
- Death of Pierre Curie
- Discovery completes the noble gas group
- Discovery of artificial radioactivity
- Discovery of cosmic rays
- Discovery of deuterium (heavy hydrogen)
- Discovery of hafnium
- Discovery of the neutron
Show 28 more sources
- First controlled nuclear chain reaction achieved
- Francium discovered
- Geiger counter detection device developed
- Hershey–Chase experiment confirms DNA is the genetic material
- Ig Nobel Prize in Peace
- Ig Nobel Prize in Physics
- Ivy Mike: first thermonuclear device test
- Marie Curie isolates pure radium
- Neutrino experimentally confirmed
- Nobel Peace Prize
- Nobel Prize in Chemistry
- Nobel Prize in Chemistry
- Nobel Prize in Chemistry
- Nobel Prize in Chemistry
- Nobel Prize in Chemistry
- Nobel Prize in Chemistry
- Nobel Prize in Chemistry
- Nobel Prize in Chemistry
- Nobel Prize in Chemistry
- Nobel Prize in Chemistry
- Nobel Prize in Chemistry
- Nobel Prize in Chemistry
- Nobel Prize in Chemistry
- Nobel Prize in Physics
- Nobel Prize in Physics
- Nobel Prize in Physics
- Nobel Prize in Physics
- Nobel Prize in Physics