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- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Astronomy_1e_(OpenStax)/07%3A_Other_Worlds_-_An_Introduction_to_the_Solar_System/7.03%3A_Dating_Planetary_SurfacesThe ages of the surfaces of objects in the solar system can be estimated by counting craters: on a given world, a more heavily cratered region will generally be older than one that is less cratered. W...The ages of the surfaces of objects in the solar system can be estimated by counting craters: on a given world, a more heavily cratered region will generally be older than one that is less cratered. We can also use samples of rocks with radioactive elements in them to obtain the time since the layer in which the rock formed last solidified. The half-life of a radioactive element is the time it takes for half the sample to decay.
- https://phys.libretexts.org/Courses/Grossmont_College/ASTR_110%3A_Astronomy_(Fitzgerald)/04%3A_Introduction_to_the_Solar_System_and_Its_Formation/4.03%3A_Dating_Planetary_SurfacesThe ages of the surfaces of objects in the solar system can be estimated by counting craters: on a given world, a more heavily cratered region will generally be older than one that is less cratered. W...The ages of the surfaces of objects in the solar system can be estimated by counting craters: on a given world, a more heavily cratered region will generally be older than one that is less cratered. We can also use samples of rocks with radioactive elements in them to obtain the time since the layer in which the rock formed last solidified. The half-life of a radioactive element is the time it takes for half the sample to decay.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Astronomy_2e_(OpenStax)/07%3A_Other_Worlds_-_An_Introduction_to_the_Solar_System/7.04%3A_Dating_Planetary_SurfacesThe ages of the surfaces of objects in the solar system can be estimated by counting craters: on a given world, a more heavily cratered region will generally be older than one that is less cratered. W...The ages of the surfaces of objects in the solar system can be estimated by counting craters: on a given world, a more heavily cratered region will generally be older than one that is less cratered. We can also use samples of rocks with radioactive elements in them to obtain the time since the layer in which the rock formed last solidified. The half-life of a radioactive element is the time it takes for half the sample to decay.
- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/17%3A_Nuclear_Physics/17.05%3A_RadioactivityThis section explores radioactivity and how it relates to a stable atom.
- https://phys.libretexts.org/Bookshelves/University_Physics/University_Physics_(OpenStax)/University_Physics_III_-_Optics_and_Modern_Physics_(OpenStax)/10%3A__Nuclear_Physics/10.04%3A_Radioactive_DecayIn the decay of a radioactive substance, if the decay constant (λ) is large, the half-life is small, and vice versa. The radioactive decay law, N=N0e−λt, uses the propertie...In the decay of a radioactive substance, if the decay constant (λ) is large, the half-life is small, and vice versa. The radioactive decay law, N=N0e−λt, uses the properties of radioactive substances to estimate the age of a substance. Radioactive carbon has the same chemistry as stable carbon, so it mixes into the ecosphere and eventually becomes part of every living organism.
- https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Introductory_Physics_II_(1112)/12%3A__Nuclear_Physics/12.04%3A_Radioactive_DecayIn the decay of a radioactive substance, if the decay constant (λ) is large, the half-life is small, and vice versa. The radioactive decay law, N=N0e−λt, uses the propertie...In the decay of a radioactive substance, if the decay constant (λ) is large, the half-life is small, and vice versa. The radioactive decay law, N=N0e−λt, uses the properties of radioactive substances to estimate the age of a substance. Radioactive carbon has the same chemistry as stable carbon, so it mixes into the ecosphere and eventually becomes part of every living organism.
- https://phys.libretexts.org/Bookshelves/University_Physics/Radically_Modern_Introductory_Physics_Text_II_(Raymond)/21%3A_Atomic_Nuclei/21.03%3A_RadioactivityThe rest energy of a nucleus (ignoring atomic effects) is just the sum of the rest energies of all the nucleons minus the total binding energy for the nucleus: The thick line represents the line of st...The rest energy of a nucleus (ignoring atomic effects) is just the sum of the rest energies of all the nucleons minus the total binding energy for the nucleus: The thick line represents the line of stability. β+ is the decay of a proton into a neutron, positron, and electron neutrino, while β− is the decay of a neutron into a proton, electron, and electron antineutrino.
- https://phys.libretexts.org/Courses/Bowdoin_College/Phys1140%3A_Introductory_Physics_II%3A_Part_2/07%3A__Nuclear_Physics/7.04%3A_Radioactive_DecayIn the decay of a radioactive substance, if the decay constant (λ) is large, the half-life is small, and vice versa. The radioactive decay law, N=N0e−λt, uses the propertie...In the decay of a radioactive substance, if the decay constant (λ) is large, the half-life is small, and vice versa. The radioactive decay law, N=N0e−λt, uses the properties of radioactive substances to estimate the age of a substance. Radioactive carbon has the same chemistry as stable carbon, so it mixes into the ecosphere and eventually becomes part of every living organism.
- https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Physics_II_(2212)/12%3A__Nuclear_Physics/12.03%3A_Radioactive_DecayThe half-life (T1/2) of a radioactive substance is defined as the time for half of the original nuclei to decay (or the time at which half of the original nuclei remain). The basic approach is ...The half-life (T1/2) of a radioactive substance is defined as the time for half of the original nuclei to decay (or the time at which half of the original nuclei remain). The basic approach is to estimate the original number of nuclei in a material and the present number of nuclei in the material (after decay), and then use the known value of the decay constant λ and Equation ???to calculate the total time of the decay, t.
- https://phys.libretexts.org/Bookshelves/College_Physics/College_Physics_1e_(OpenStax)/31%3A_Radioactivity_and_Nuclear_Physics/31.01%3A_Nuclear_RadioactivityThe discovery and study of nuclear radioactivity quickly revealed evidence of revolutionary new physics. In addition, uses for nuclear radiation also emerged quickly—for example, people such as Ernest...The discovery and study of nuclear radioactivity quickly revealed evidence of revolutionary new physics. In addition, uses for nuclear radiation also emerged quickly—for example, people such as Ernest Rutherford used it to determine the size of the nucleus and devices were painted with radon-doped paint to make them glow in the dark. We therefore begin our study of nuclear physics with the discovery and basic features of nuclear radioactivity.
