Argon (18 Ar) has 26 known isotopes, from 29 Ar to 54 Ar, of which three are stable (36 Ar, 38 Ar, and 40 Ar). On Earth, 40 Ar makes up 99.6% of natural argon. The longest-lived radioactive isotopes are 39 Ar with a half-life of 268 years, 42 Ar with a half-life of 32.9 years, and 37 Ar with a half-life of 35.04 days.

Nuclear magnetic properties of the NMR active Nuclide 39 Ar. The following table shows the atomic nuclei that are isotonic (same neutron number N = 21) and isobaric (same nucleon number A = 39) with Argon-39. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides. Last update: 2023-10-04.

2021年11月20日 · The radioactive isotope 39 Ar is an ideal tracer for ocean ventilation, groundwater flow, and for dating mountain glaciers. With a half-life of 269 years, it covers the age range from a few tens to about 1800 years.

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Argon–argon (or 40 Ar/ 39 Ar) dating is a radiometric dating method invented to supersede potassium–argon (K/Ar) dating in accuracy. The older method required splitting samples into two for separate potassium and argon measurements, while the newer method requires only one rock fragment or mineral grain and uses a single measurement of ...

2016年8月13日 · 跨入 21世纪,我国多家 40 Ar-39 Ar 实验室购置了英国 GV Instrument 5400 R 和 Helix-MC R 稀有气体质谱计 ,配置的气体提取装置有石墨炉 、美国 NewWaveC 生产的 MIR-10 CCO 2 红外激光器(λ=10.6 μm)或 UP-213 R 紫外激光器(5 倍频 Nd-YAG 激光器,λ=213 nm)(贺怀宇等, 2004;高洪林, 2005;邱华宁 ...

The half-lives of three argon isotopes have been carefully determined, with the following results: Ar 37, 35.1 ± 0.1 days; Ar 39, 269 ± 3 years; Ar 42, 32.9 ± 1.1 years. By combining the Ar 42 value with earlier data, a cross section of 0.5 ± 0.1 barn is calculated for the reaction, with thermal neutrons, Ar 41 (n,γ)Ar 42 .

2019年9月11日 · The 40 Ar/ 39 Ar technique is the most versatile dating technique available in terms of the applicable age range and diversity of geological environments, having been used to date materials from the formation of our Moon ca. 4 billion years ago to historically recorded volcanic eruptions .

摘要: 同位素地质年代学的各种定年方法都有其特定的测定对象（矿物或全岩）和适用范围，致使许多金属矿床难以进行年龄测定.为解决此难题，建立了流体包裹体 40 Ar/ 39 Ar定年方法，经过30年的探索发展和不断改进完善，已广泛应用于热液矿床、变质岩和石英 ...

2021年10月14日 · Argon-39 atom is a trace radioisotope of argon with atomic mass of 38.964313 and a half-life of 269 years. It has a role as an isotopic tracer.