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Ionizing radiation particle of two protons and two neutrons
Alpha particles, also called alpha rays or alpha radiation, consist of two protons and two neutrons bound together into a particle identical to the nucleus
Alpha_particle
Physical interaction of charged particles
atomic, nuclear and subatomic systems, began with Ernest Rutherford's alpha particle scattering model of 1911. The ingredients in Rutherford's approach were
Coulomb_scattering
Experiments proving existence of atomic nuclei
its mass is concentrated. They deduced this after measuring how an alpha particle beam is scattered when it strikes a thin metal foil. The experiments
Rutherford scattering experiments
Rutherford_scattering_experiments
Type of radioactive decay
Alpha decay or α-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus). The parent nucleus transforms
Alpha_decay
Quantitative measurement of the energy of alpha particles
Alpha spectrometry (also known as alpha(-particle) spectroscopy) is the quantitative study of the energy of alpha particles emitted by a radioactive nuclide
Alpha-particle_spectroscopy
Type of spectrometer
alpha particle X-ray spectrometer (APXS) is a spectrometer that analyses the chemical element composition of a sample from scattered alpha particles and
Alpha particle X-ray spectrometer
Alpha_particle_X-ray_spectrometer
Ionizing radiation
regarded as being more ionizing than gamma rays, but less ionizing than alpha particles. The higher the ionising effect, the greater the damage to living tissue
Beta_particle
Nuclear fusion reaction
The triple-alpha process is a set of nuclear fusion reactions by which three helium-4 nuclei (alpha particles) are transformed into carbon. Helium accumulates
Triple-alpha_process
Retarding force acting on charged particles due to interactions with matter
force acting on charged particles, typically alpha and beta particles, due to interaction with matter, resulting in loss of particle kinetic energy. Stopping
Stopping power (particle radiation)
Stopping_power_(particle_radiation)
Type of radiation therapy to treat cancer
Targeted alpha-particle therapy (or TAT) is an in-development method of targeted radionuclide therapy of various cancers. It employs radioactive substances
Targeted alpha-particle therapy
Targeted_alpha-particle_therapy
Software bug that seems to change when debugging
has occurred only once) may explain it away as a soft error due to alpha particles or cosmic rays affecting the hardware, a well-documented phenomenon
Heisenbug
Harmful high-frequency radiation
10 electronvolts (eV). Ionizing subatomic particles include alpha particles, beta particles, and neutrons. These particles are created by radioactive decay, and
Ionizing_radiation
Iconic quantum mechanics problem
and yet, this occurs on a daily basis in all particle collider experiments. The problem of alpha particle track was discussed at the Fifth Solvay conference
Mott_problem
American writer, engineer and scientist (1951–2018)
"alpha particle problem", which was affecting the reliability of integrated circuits as device features reached a critical size where a single alpha particle
Timothy_C._May
First modern model of the atom
for emission spectra and valencies. Based on experimental studies of alpha particle scattering (in the gold foil experiment), Ernest Rutherford developed
Plum_pudding_model
Class of subatomic particle
numbers such as deuterium, helium-4 (the alpha particle), carbon-12, lead-208, and many others. As quantum particles, the behaviour of multiple indistinguishable
Boson
Smallest unit of a chemical element
beam of alpha particles. They did this to measure the scattering patterns of the alpha particles. They spotted a small number of alpha particles being deflected
Atom
NASA rover exploring Mars since 2012
September 13, 2012. Retrieved October 11, 2012. "MSL Science Corner: Alpha Particle X-ray Spectrometer (APXS)". NASA/JPL. Archived from the original on
Curiosity_(rover)
Scientific background leading to the discovery of subatomic particles
half of the 20th century. Early in the century, Ernest Rutherford used alpha particle scattering to discover that an atom has its mass and electric charge
Discovery_of_the_neutron
Empirical rule in nuclear physics
the energy of the alpha particles emitted. Roughly speaking, it states that short-lived isotopes emit more energetic alpha particles than long-lived ones
Geiger–Nuttall_law
First letter of the Greek alphabet
The letter alpha represents various concepts in physics and chemistry, including alpha radiation, angular acceleration, alpha particles, alpha carbon and
Alpha
Waves or particles moving through space
x-rays, and gamma radiation (γ) particle radiation consisting of particles of non-zero rest energy, such as alpha radiation (α), beta radiation (β)
Radiation
Fast-moving particles with energy
subatomic particles which have no charge; neutron radiation neutrinos mesons muons Mechanisms that produce particle radiation include: alpha decay Auger
Particle_radiation
Chemical element with atomic number 85 (At)
naturally; they are usually produced by bombarding bismuth-209 with alpha particles. Astatine is an extremely radioactive element; all its isotopes have
Astatine
Helium-3 isotope nucleus
consisting of two protons and two neutrons, is called an alpha particle or an alpha for short. This particle is the daughter product in the beta-minus decay of
Helion_(chemistry)
Isotope of polonium
extreme toxicity is attributed to intense radioactivity, mostly due to alpha particles, which easily cause radiation damage, including cancer in surrounding
Polonium-210
Measure for the energy lost by ions per traversed distance
protons, alpha particles, and the heavier nuclei called HZE ions found in cosmic rays or produced by particle accelerators. These particles cause frequent
Linear_energy_transfer
shape. The unusual cosmic abundance of alpha nuclides has inspired geometric arrangements of alpha particles as a solution to nuclear shapes, although
Shape_of_the_atomic_nucleus
Type of computing error
radioactive decay usually causes a soft error by alpha particle emission. The positive charged alpha particle travels through the semiconductor and disturbs
Soft_error
Particle detector for visualizing ionizing radiation
supersaturated vapor of water or alcohol. An energetic charged particle (for example, an alpha or beta particle) interacts with the gaseous mixture by knocking electrons
Cloud_chamber
New Zealand physicist and chemist (1871–1937)
nitrogen nuclei were bombarded with alpha particles. These experiments led him to discover the emission of a subatomic particle that he initially called the
Ernest_Rutherford
Transformation of a nuclide to another
light particles are often abbreviated in this shorthand, typically p for proton, n for neutron, d for deuteron, α representing an alpha particle or helium-4
Nuclear_reaction
Subatomic particle with positive charge
sulfide screen at a distance, up to 28 cm, well beyond the distance of alpha-particle range of travel but instead corresponding to the range of travel of
Proton
Emissions from unstable atomic nuclei
of deflection, it was clear that alpha particles were much more massive than beta particles. Passing alpha particles through a very thin glass window
Radioactive_decay
Probability of a given process occurring in a particle collision
in a collision of two particles. For example, the Rutherford cross section is a measure of probability that an alpha particle will be deflected by a
Cross_section_(physics)
Effectiveness of radiation in radiobiology
a micrometer) along their path. In contrast, the much more massive alpha particles and neutrons leave a denser trail of ionized atoms in their wake, spaced
Relative biological effectiveness
Relative_biological_effectiveness
passes. For example, if the ionising particle passing through the material is a positive ion like an alpha particle or proton, it will collide with atomic
Range_(particle_radiation)
Third mission of the Discovery program; polar orbital reconnaissance of the Moon
Neutron spectrometer, a Magnetometer, an Electron Reflectometer, an Alpha Particle Spectrometer, and a Doppler Gravity Experiment. The instruments were
Lunar_Prospector
Isotope of helium
nucleus consists of two protons and two neutrons and is identical to an alpha particle. Helium-4 makes up about one quarter of the ordinary matter in the universe
Helium-4
Subatomic particle with no charge
fractional spin. In 1931, Walther Bothe and Herbert Becker found that if alpha particle radiation from polonium fell on beryllium, boron, or lithium, an unusually
Neutron
1911 theoretical description of an atom
directed the Geiger–Marsden experiment in 1909, which showed much more alpha particle recoil than J. J. Thomson's plum pudding model of the atom could explain
Rutherford_model
Particle smaller than an atom
subatomic particle is a particle smaller than an atom. According to the Standard Model of particle physics, a subatomic particle can be a composite particle or
Subatomic_particle
Physical particle with an electric charge
particles. protons positrons (antielectrons) positively charged pions alpha particles cations electrons antiprotons muons tauons negative charged pions anions
Charged_particle
Topics referred to by the same term
Alpha strike may refer to: Alpha strike (engineering), when an alpha particle enters and causes damage to the data contained in a computer processor Alpha
Alpha_strike
Chemical element with atomic number 96 (Cm)
bombarded the newly discovered element plutonium (the isotope 239Pu) with alpha particles. This was then sent to the Metallurgical Laboratory at the University
Curium
Production of the elements in a supernova explosion
passing shock wave launched by collapse of the core could synthesize non-alpha-particle isotopes more effectively than hydrostatic burning could, suggesting
Supernova_nucleosynthesis
NASA mission to explore Mars via two rovers
iron-bearing rocks and soils. One Mössbauer measurement took about 12 hours. Alpha particle X-ray spectrometer (APXS), developed by the Max Planck Institute for
Mars_Exploration_Rover
Alpha strike is a term referring to the event when an alpha particle, a composite charged particle composed of two protons and two neutrons, enters a computer
Alpha_strike_(engineering)
Chemical element with atomic number 92 (U)
valence electrons. Uranium radioactively decays, usually by emitting an alpha particle. The half-life of this decay varies between 159,200 and 4.5 billion
Uranium
1954 U.S. thermonuclear weapon test in the Marshall Islands
isotope would absorb a neutron from the fissioning plutonium and emit an alpha particle and tritium in the process, of which the latter would then fuse with
Castle_Bravo
Investigation of unlawful nuclear materials and their proliferation
detector can lead to improved resolution, but decreased particle detection. The advantages of alpha-particle spectroscopy include relatively inexpensive equipment
Nuclear_forensics
Reaction that combines atomic nuclei
commonly treated as a single quantum mechanical particle in nuclear physics, namely, the alpha particle. The situation is similar if two nuclei are brought
Nuclear_fusion
Chemical element with atomic number 84 (Po)
neutrons and alpha particles, and poison (e.g., poisoning of Alexander Litvinenko). It is extremely dangerous to humans. 210Po is an alpha emitter that
Polonium
NASA satellite of the Explorer program, at SE-L1 from 1997
Electron, Proton, and Alpha Monitor (EPAM) instrument on the ACE spacecraft is designed to measure a broad range of energetic particles over nearly the full
Advanced_Composition_Explorer
Nuclide made up of alpha particles
An alpha nuclide is a nuclide that consists of an integer number of alpha particles. Alpha nuclides have equal, even numbers of protons and neutrons;
Alpha_nuclide
Norwegian pharmaceutical company
the field of alpha-particle emitting radiopharmaceuticals. The lead product of the company, Xofigo is the first marketed alpha-particle emitting radiopharmaceutics
Algeta
Radioactive toy lab set
radiation sources: beta-alpha (Pb-210) pure beta (possibly Ru-106) gamma (Zn-65) "Nuclear spheres" for making a model of an alpha particle Gilbert Atomic Energy
Gilbert U-238 Atomic Energy Laboratory
Gilbert_U-238_Atomic_Energy_Laboratory
Instrument used for measuring ionizing radiation
the nuclear industry. It detects ionizing radiation such as alpha particles, beta particles, and gamma rays using the ionization effect produced in a Geiger–Müller
Geiger_counter
of alpha particles. They spotted alpha particles being deflected by angles greater than 90°. According to Thomson's model, all of the alpha particles should
History_of_atomic_theory
Analytical technique to determine structure and composition of materials
backscattering of a beam of high energy ions (typically protons or alpha particles) impinging on a sample. Rutherford backscattering spectrometry is named
Rutherford backscattering spectrometry
Rutherford_backscattering_spectrometry
Particle, atom or molecule with a net electrical charge
seen in O2− 2 (peroxide, negatively charged, polyatomic) and He2+ (alpha particle, positively charged, monatomic). In the case of physical ionization
Ion
Helium isotope with two protons and one neutron
spallation reactions are a lesser contributor than the production of 4He by alpha particle emissions. The total amount of helium-3 in the mantle may be in the
Helium-3
3D imaging technique using inelastic neutron scattering
associated particle imaging, deuterium-tritium fusion reactions each produce a fast neutron and an associated particle (such as an alpha particle), which
Associated_particle_imaging
Core of an atom composed of nucleons
fast moving alpha particles. He realized that the plum pudding model could not be accurate and that the deflections of the alpha particles could only be
Atomic_nucleus
1938 achievement in physics
beryllium with alpha particles: 9 4Be + 4 2He → 12 6C + n Irène Curie and Frédéric Joliot irradiated aluminium foil with alpha particles and found that
Discovery_of_nuclear_fission
Moving charge energy loss formula found by Hans Bethe
mean energy loss per distance travelled of swift charged particles (protons, alpha particles, atomic ions) traversing matter (or alternatively the stopping
Bethe_formula
Chemical element with atomic number 94 (Pu)
emitting a 5.157 MeV alpha particle. This amounts to 9.68 watts of power. Heat produced by the deceleration of these alpha particles makes it warm to the
Plutonium
Topics referred to by the same term
numbers ALPHA, a particle physics experiment at CERN ALPHA Collaboration, (Antihydrogen Laser PHysics Apparatus), a team of scientists Alpha particle, form
Alpha_(disambiguation)
Chemical element with atomic number 118 (Og)
can be tunneled through. Alpha particles are commonly produced in radioactive decays because the mass of an alpha particle per nucleon is small enough
Oganesson
Reaction that splits an atomic nucleus
of 90% helium-4 nuclei with more energy than alpha particles from alpha decay (so-called "long range alphas" at ~16 megaelectronvolts (MeV)), plus helium-6
Nuclear_fission
Chemical element with atomic number 2 (He)
elements (thorium and uranium, although there are other examples), as the alpha particles emitted by such decays consist of helium-4 nuclei. This radiogenic
Helium
Boson with spin equal to zero
Higgs and François Englert. Various known composite particles are scalar bosons, e.g. the alpha particle and scalar mesons. The φ4-theory or quartic interaction
Scalar_boson
Nuclear fusion reaction
CNO cycle, but re-generated in a later step. The end product is one alpha particle (a stable helium nucleus), two positrons, and two electron neutrinos
CNO_cycle
Natural nuclear reactions forming chemical elements
Cosmic rays are highly energetic charged particles from beyond Earth, ranging from protons, alpha particles, and nuclei of many heavier elements. About
Cosmic_ray_spallation
Made by a natural terrestrial nuclear reaction
reaction that produces nucleogenic nuclides is usually interaction with an alpha particle or the capture of fission or thermal neutrons. Some nucleogenic isotopes
Nucleogenic
Field of physics that studies atomic interactions
supervision fired alpha particles (helium 4 nuclei) at a thin film of gold foil. The plum pudding model had predicted that the alpha particles should come out
Nuclear_physics
Nuclear fission yielding three products
light particles, with the most common mode of quaternary fission apparently being two large particles and two alpha particles (rather than one alpha, the
Ternary_fission
Chemical element with atomic number 89 (Ac)
half-life of 21.772 years, predominantly emitting beta and sometimes alpha particles, and 228Ac, which is beta active with a half-life of 6.15 hours. One
Actinium
Indian lunar mission (2023–Present)
Hypersensitive Ionosphere and Atmosphere—Langmuir Probe (RAMBHA-LP) An alpha particle X-ray spectrometer (APXS) will derive the chemical composition and infer
Chandrayaan-3
Chemical element with atomic number 115 (Mc)
can be tunneled through. Alpha particles are commonly produced in radioactive decays because the mass of an alpha particle per nucleon is small enough
Moscovium
Single directional neutron source
fusion of the two particles, releasing energetic neutrons. In 1930 Walther Bothe and Herbert Becker in Germany found that alpha particles striking light
Neutron_howitzer
Radioactive decay by emitting a nucleus
an atomic nucleus. The emitted nucleus (cluster) is larger than an alpha particle (a 4 2He nucleus) which has two protons and two neutrons), but is smaller
Cluster_decay
Classification
Radioiodines, including iodine-131 78, 100D 2012 2009 Radionuclides, alpha-particle-emitting, internally deposited 78, 100D 2012 2009 Specific radionuclides
IARC_group_1
Chemical element with atomic number 104 (Rf)
can be tunneled through. Alpha particles are commonly produced in radioactive decays because the mass of an alpha particle per nucleon is small enough
Rutherfordium
Mission including first robotic rover to operate on Mars (1997)
The first analysis on a rock started on Sol 3 with Barnacle Bill. The Alpha Particle X-ray Spectrometer (APXS) was used to determine its composition, the
Mars_Pathfinder
Very small nuclear reactor of 1-20 MW capacity
(PET) Therapy Fast-neutron Neutron capture therapy of cancer Targeted alpha-particle Proton-beam Tomotherapy Brachytherapy Radiosurgery Radiopharmacology
Nuclear_microreactor
International nuclear fusion research and engineering megaproject
tritium fuse, two nuclei come together to form a helium nucleus (an alpha particle), and a high-energy neutron. 2H + 3H → 4He + 1 0n + 17.59 MeV While
ITER
Isotope of beryllium
radionuclide with 4 neutrons and 4 protons. It is an unbound resonance of two alpha particles and nominally an isotope of beryllium. This has important ramifications
Beryllium-8
Chemical element with atomic number 86 (Rn)
has been inferred later from data obtained from the Lunar Prospector alpha particle spectrometer. Radon is found in some petroleum. Because radon has a
Radon
Derived SI unit of equivalent dose of ionizing radiation
sphere phantom. Examples of low penetrating radiation are alpha particles, beta particles and low-energy photons. This dose quantity is used for the
Sievert
Light produced in a material by bombardment with ionizing radiation
a material by bombardment with ionizing radiation such as alpha particles, beta particles, or gamma rays. Radioluminescence is used as a low level light
Radioluminescence
Number of heavy particles in the atomic nucleus
uranium-238 usually decays by alpha decay, where the nucleus loses two neutrons and two protons in the form of an alpha particle. Thus the atomic number and
Mass_number
Chemical elements with atomic numbers from 104 to 120
can be tunneled through. Alpha particles are commonly produced in radioactive decays because the mass of an alpha particle per nucleon is small enough
Superheavy_element
Antiparticle of the electron
The positron or antielectron is the particle with an electric charge of +1e, a spin of 1/2 ħ (the same as the electron), and the same mass as an electron
Positron
concentrations in people and the environment. Alpha decay is characterized by the emission of an alpha particle, a 4He nucleus. The mode of this decay causes
Radioanalytical_chemistry
Used to measure spectral components of light
here a particle counter should be placed. Varying B, this makes possible to measure the energy spectrum of alpha particles in an alpha particle spectrometer
Spectrometer
Isotope of actinium
properties of actinium-225 (emitting four alpha particles within about an hour) are favorable for usage in targeted alpha therapy (TAT); clinical trials have
Actinium-225
Chemical element with atomic number 103 (Lr)
can be tunneled through. Alpha particles are commonly produced in radioactive decays because the mass of an alpha particle per nucleon is small enough
Lawrencium
Chemical element with atomic number 117 (Ts)
can be tunneled through. Alpha particles are commonly produced in radioactive decays because the mass of an alpha particle per nucleon is small enough
Tennessine
Neutron source used in some nuclear weapons
and polonium, allowing the alpha particles from the polonium to impinge on the beryllium atoms. Reacting to alpha particle bombardment, the beryllium
Modulated_neutron_initiator
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