List of radioactive nuclides by half-life - Wikipedia
This is a list of radioactive nuclides (sometimes also called isotopes), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds.
8.3: Half-life of radioisotopes - Chemistry LibreTexts
The half-life is independent of concentration, temperature, and pressure, i.e., the t 1/2 is a characteristic constant of a radioisotope. Natural radioactive isotopes usually have a longer half-life, e.g., t 1/2 carbon-14 is 5730 years and uranium-235 is 7.0 x 10 8 years.
11.2: Half-Life - Chemistry LibreTexts
2022年8月13日 — The half-life of a radioactive isotope is the amount of time it takes for one-half of the radioactive isotope to decay. The half-life of a specific radioactive isotope is constant; it is unaffected by conditions and is independent of the initial amount of that isotope.
11.5: Radioactive Half-Life - Chemistry LibreTexts
An isotope’s half-life allows us to determine how long a sample of a useful isotope will be available, and how long a sample of an undesirable or dangerous isotope must be stored before it decays to a low-enough radiation level that is no longer a problem.
What Are Isotopes’ Half-Lives And Why Do They Matter?
2023年11月3日 — The fact that isotopes have a unique half-life has proven perhaps humanity’s most powerful tool for understanding the deep history of our planet. But what is a half-life, how do we use them...
Properties of Radioactive Isotopes: An Overview
2024年2月22日 — When uranium-238 decays, it produces several isotopes of: All of these radioactive atoms are part of our natural environment. There are four types of radiation given off by radioactive atoms. Radioactive atoms give off one or more of these types of radiation to reach a more stable state.
Half-life | Definition & Facts | Britannica
3 天之前 — half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time interval required for the number of disintegrations per second of a radioactive material to decrease by one-half.
Radioactive Half-Life – Physical Half-Life - Nuclear Power for …
The half-life is the amount of time it takes for a given isotope to lose half of its radioactivity. If a radioisotope has a half-life of 14 days, half of its atoms will have decayed within 14 days. In 14 more days, half of that remaining half will decay, and so on.
The half-life of a radioisotope is defined as the amount of time necessary for one-half of the quantity of nuclide to decay, i.e., be converted into another species. The conversions involve either alpha or beta particle release, and the reaction can be followed by measuring the number of particles given off.
Half-Life Formula: Components and Applications - HowStuffWorks
2024年2月14日 — The half-life of a radioactive isotope — denoted by T 1/2 — varies widely depending on the specific isotope. Each has its own unique half-life. Some isotopes have very short half-lives, measured in seconds or minutes, while others have half-lives that extend over thousands or millions of years.