positron

简明释义

英[ˈpɒzɪtrɒn]美[ˈpɑːzɪtrɑːn]

n. [物] 正电子，阳电子

英英释义

单词用法

同义词

反义词

例句

1.These experimental results give the corresponding positron experiment data for the application of cuprate superconductors and study of the mechanism.

该研究结果为铜氧化物超导体的应用和机理研究提供了相应的正电子实验资料。

2.From earlier results using much less data, the positron cloud seemed to be spherical and centred on the centre of the galaxy.

从使用较少数据的早期结果来看，正电子云似乎是呈球状位于银河中心。

3.Nickel, electrodeposited from twelve typical plating baths, were investigated by positron annihilation lifetime spectroscopy.

应用正电子湮没寿命谱研究了十二种典型镍镀层的结构缺陷。

4.Objective To evaluate the value of high energy positron imaging in the diagnosis of colon neoplasm.

目的评估高能正电子成像技术在结肠肿瘤诊断中的临床实用价值。

5.Positron emission tomography (PET) is an emerging modality in lung cancer staging.

正电子放射断层造影术(PET)是新兴的适用于肺癌分期的检查方法。

6.Both rely on mathematical calculations to determine the location from which a positron or phot on was emitted.

这两种成像方法均依靠精确的计算来决定正电子或光于发射的位置。

7.The new collider has to provide exact measurements of electron-positron annihilation.

新型的对撞机必须提供电子-正电子湮灭的准确测量结果。

8.Objective:To discuss the nursing countermeasure for receiving high quality Positron Emission Tomography (PET) image.

目的：探讨正电子发射计算机断层显像检查中的护理方法。

9.It was a very difficult first step to accept the positron.

接受正电子是艰难的第一步。

10.In particle physics, a positron is the antimatter counterpart of an electron.

在粒子物理学中，正电子是电子的反物质对应物。

11.When a positron encounters an electron, they can annihilate each other, producing gamma rays.

当一个正电子遇到一个电子时，它们可以相互湮灭，产生伽马射线。

12.Positron Emission Tomography (PET) scans utilize positrons to create detailed images of the body.

正电子发射断层扫描（PET）利用正电子来创建身体的详细图像。

13.Research in antimatter often involves studying the properties of positrons and their interactions.

反物质的研究通常涉及研究正电子及其相互作用的特性。

14.A positron has the same mass as an electron but carries a positive charge.

正电子的质量与电子相同，但带有正电荷。

作文

In the realm of particle physics, the term positron refers to the antiparticle of the electron. It possesses the same mass as an electron but carries a positive charge instead of a negative one. The discovery of the positron was a significant milestone in understanding the fundamental components of matter. It was first predicted by Paul Dirac in 1928 and later confirmed experimentally by Carl Anderson in 1932. This groundbreaking work not only validated Dirac's theories but also opened up new avenues for research in quantum mechanics and particle physics. The existence of the positron challenges our conventional understanding of matter and antimatter. In simple terms, antimatter is composed of particles that have opposite charges compared to their matter counterparts. For every particle in the universe, there exists an antiparticle. When a positron encounters an electron, they can annihilate each other, resulting in the release of energy in the form of gamma-ray photons. This annihilation process is not just a fascinating phenomenon; it has practical applications as well. One of the most notable applications of positrons is in the field of medical imaging, particularly in Positron Emission Tomography (PET) scans. In this technique, a radioactive substance that emits positrons is introduced into the body. As the positrons interact with electrons in the body's tissues, they produce gamma rays, which are then detected to create detailed images of the organs and tissues. This non-invasive imaging technique has revolutionized the diagnosis and treatment of various diseases, including cancer, by allowing doctors to observe metabolic processes in real time. Moreover, the study of positrons contributes to our understanding of the universe's composition. Theoretical physicists propose that during the Big Bang, equal amounts of matter and antimatter were created. However, our observable universe is predominantly made of matter, leading to the question: where did all the antimatter go? Research into positrons and their behavior may help scientists uncover the asymmetry between matter and antimatter, shedding light on one of the most profound mysteries in cosmology. In conclusion, the positron is more than just an elementary particle; it represents a crucial piece of the puzzle in our quest to understand the universe. From its role in annihilation reactions to its applications in medical imaging, the positron continues to intrigue scientists and researchers alike. As we delve deeper into the realm of particle physics, the study of positrons will undoubtedly yield further insights into the fundamental nature of reality, ultimately enhancing our comprehension of both the microscopic and macroscopic worlds around us.

在粒子物理学的领域中，术语正电子指的是电子的反粒子。它与电子具有相同的质量，但携带正电荷而不是负电荷。正电子的发现是理解物质基本组成的重要里程碑。它最早由保罗·狄拉克于1928年预测，并在1932年由卡尔·安德森实验验证。这项开创性的工作不仅验证了狄拉克的理论，还为量子力学和粒子物理学的研究开辟了新的途径。 正电子的存在挑战了我们对物质和反物质的传统理解。简单来说，反物质是由与其物质对应粒子电荷相反的粒子组成的。宇宙中每个粒子都有一个反粒子。当正电子遇到电子时，它们可以互相湮灭，释放出以伽马射线光子形式存在的能量。这种湮灭过程不仅是一种迷人的现象；它也有实际应用。 正电子最显著的应用之一是在医学成像领域，特别是在正电子发射断层扫描（PET）中。在这种技术中，将释放正电子的放射性物质引入体内。当正电子与体内组织中的电子相互作用时，会产生伽马射线，这些伽马射线随后被检测以创建器官和组织的详细图像。这种非侵入性的成像技术彻底改变了各种疾病的诊断和治疗，包括癌症，使医生能够实时观察代谢过程。 此外，对正电子的研究有助于我们理解宇宙的组成。理论物理学家提出，在大爆炸期间，创造了相等数量的物质和反物质。然而，我们可观察的宇宙主要由物质组成，这导致了一个问题：所有的反物质去哪儿了？对正电子及其行为的研究可能有助于科学家揭示物质和反物质之间的不对称性，从而揭示宇宙学中最深刻的奥秘之一。 总之，正电子不仅仅是一个基本粒子；它代表了我们理解宇宙的关键部分。从其在湮灭反应中的作用到其在医学成像中的应用，正电子继续吸引着科学家和研究人员的兴趣。随着我们深入粒子物理学的领域，对正电子的研究无疑会为我们提供对现实基本性质的进一步见解，最终增强我们对周围微观和宏观世界的理解。