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Updated: Jul 20, 2025

Automated 90Sr Separation and Preconcentration in a Lab-on-Valve System at Ppq Level
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Automated 90Sr Separation and Preconcentration in a Lab-on-Valve System at Ppq Level

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贝塔粒子发射放射性核素的国际参考系统:通过试点研究CCRI ((II) -P1.Co-60进行验证

Romain Coulon1, Monica Aguiar Leobino da Silva2, Emma Bendall3

  • 1Bureau International des Poids et Mesures, Pavillon de Breteuil, F-92312, Sèvres Cedex, France.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine
|July 29, 2023
PubMed
概括

国际重量与测量局 (BIPM) 开发了一种新的液体闪计数器,用于放射性标准等效. 这种方法与现有系统一致,达到高精度,但需要注意杂质.

关键词:
这是ESIR的ESIR.国际参考系统的国际参考系统.液体闪计数计算液体闪计数放射性核酸计量学 放射性核酸计量学这里是SIRS,SIRS.标准化 标准化 标准化

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Isotopes and Radioisotopes

In the early 1900s, English chemist Frederick Soddy realized that an element could have atoms with different masses that were chemically indistinguishable. These different types are called isotopes — atoms of the same element that differ in mass. Isotopes differ in mass because they have different numbers of neutrons but are chemically identical because they have the same number of protons. Soddy was awarded the Nobel Prize in Chemistry in 1921 for this discovery.
An isotope containing...
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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
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Radioactivity and Nuclear Equations03:18

Radioactivity and Nuclear Equations

Nuclear chemistry is the study of reactions that involve changes in nuclear structure. The nucleus of an atom is composed of protons and, except for hydrogen, neutrons. The number of protons in the nucleus is called the atomic number (Z) of the element, and the sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are isotopes of the same element.
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Types of Radioactivity

The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
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Nuclear Transmutation

Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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