Attree, R.W., Cabell, M.O., Cushing, R.L., and Pieroni, J.J., 1962: A Calorimetric Determination of the Half-life of Thorium-230 and a Consequent Revision to its Neutron Capture Cross Section, Can. J. Phys., v. 40, p. 194-201....
Explain the concept of the half-life of medication with an example. What is uranium-thorium dating? How do you calculate rate constant from half-life? When determining half life, how do you determine the elements of half life to calculate?
有一个科学术语叫做半衰期(half life)。例如,铀238的半衰期约为45亿年,意思就是,每过45亿年,一个U-238原子核会有一半的概率衰变。有一个著名的射击游戏叫做《半条命》,其实这个游戏的英文名是half life,本意就是“半衰期”,所谓“半条命”实际上是望文生义的误译。为了帮助大家理解这个概念,美国韦尔斯利学院(...
One half-life is the time required for one half of any given quantity of the substance to decay. For example, the half-life of a particular radioactive isotope of thorium is 8 minutes. If 100 grams of the isotope are originally present, then only 50 grams will remain after 8 minutes, ...
The half-life of\(^{212}\)Po was measured with the highest up-to-date accuracy as\(T_{1/2}=295.1(4)\)ns by using thorium-loaded liquid scintillator. 1Introduction The\(^{212}\)Po nuclide is the\(\alpha \)active daughter of the\(^{212}\)Bi from the\(^{232}\)Th decay chai...
The half-life of radium-223 has been determined simultaneously by microcalorimetry and proportional alpha counting, with 5 mc of radium-223 separated from actinium-227 and thorium-227 by cation exchange. A 4-mc fraction of the purified radium-223 was transferred to a tantalum capsule, dried, ...
To investigate the feasibility of the Pa231 growth method of dating marine carbonates, measurements of protactinium, as well as of uranium and thorium isot... Ku,Teh-Lung - 《Journal of Geophysical Research》 被引量: 90发表: 1968年 Calorimetric determination of the half-life of protactinium-231...
Two metallic240Pu sources were certified as reference standards of spontaneous-fission activity and neutron flux. The certification results were used to de... WP Hutchinson,AG White 被引量: 0发表: 1954年 Determination of the Half-Life of Thorium-234. The procedure described here involves each st...
Figure 1. Radioactive decay reduces the number of radioactive nuclei over time. In one half-lifet1/2, the number decreases to half of its original value. Half of what remains decay in the next half-life, and half of those in the next, and so on. This is an exponential decay, as ...
Half-life is defined as the time it takes for one-half of a radioactive element to decay into a daughter isotope. As radioactive isotopes of elements decay, they lose their radioactivity and become a brand new element known as a daughter isotope. By measuring the ratio of the amount of ...