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ansenko
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Looking for researches, articles and experimental values conserning factors which influence to half-life speed for different isotopes.
mathman said:
ansenko said:Until recently it was considered that, for example NaCl as an stable compounds is only possible.
ansenko said:
e.bar.goum said:Perhaps you need to reframe the question.
T½: From the weighted average of the values 5780 y 65 [Watt et al. Intern. J. Appl. Radiat. Isot. 11 (1961) 68], 5680 y 40 (1962Ol04), 5745 y 50 (http://www.nndc.bnl.gov/nsr/nsrlink.jsp?1964Hu09,B ), 5660 y 30 (1968Be47), and 5736 y 56 (1968ReZZ and 1972Em01). The reduced-χ2 for this average is 1.06. These values were obtained from specific activity measurements. Values that have not been included in the average, all earlier, are 4700 y 400 (1946Re10), 5100 y 200 (1948No02), 7200 y 500 (1948Ya02), 6360 y 200 (1949Ha52), 5589 y 75 (1949Jo07), 5580 y 90 [Engelkemeir & Libby, Rev. Sci. Instr. 21 (1950) 550], 6360 y 190 and 5513 y 165 [Miller et al., Phys. Rev. 77 (1950) 714], 5370 y 200 [Manov & Curtiss, J. Research Nat. Bur. Std. 46 (1951) 328], 6100 y 85 (http://www.nndc.bnl.gov/nsr/nsrlink.jsp?1952Je11,B ), 5900 y 250 [Caswell et al., J. Research Nat. Bur. Std. 53 (1954) 27]. These values were omitted because of their large uncertainties and the later improvements in the measurement methods. From a similar evaluation, 1990Ho28 gives a result of 5715 y 30 from an unweighted average of eight values. Evaluated by V. Chechev in 1998 in conjunction with the Decay Data Evaluation Project (1999BeZS,1999BeZQ).
The findings of that paper were later discussed here which found no such variation in other data sets.ansenko said:Going to add some related links in this tread:
1. Evidence for Correlations Between Nuclear Decay Rates and Earth-Sun Distance
http://arxiv.org/PS_cache/arxiv/pdf/0808/0808.3283v1.pdf
Half-life speed refers to the amount of time it takes for a substance to decay to half of its original amount. This is often used to measure the rate at which radioactive elements decay, but it can also refer to the rate of decay for any substance, such as medication or chemicals.
Several factors can influence the half-life speed of a substance. These include the type of substance, temperature, pressure, and the presence of other chemicals or elements that can affect the rate of decay. Additionally, the physical and chemical properties of the substance can also play a role in its half-life speed.
In general, higher temperatures can increase the rate of decay, leading to a faster half-life speed. This is because higher temperatures provide more energy for molecules to collide and react, thus increasing the likelihood of decay. However, this may not always be the case, as some substances may have a slower half-life speed at higher temperatures due to changes in their physical or chemical properties.
No, the half-life speed of a substance is not constant and can vary depending on the conditions in which it is decayed. For example, the half-life speed of a radioactive element may change if it is exposed to different levels of radiation or if the temperature or pressure is altered. Additionally, some substances may have multiple decay pathways, leading to varying half-life speeds.
Half-life speed is an important concept in many fields of scientific research. In chemistry, it can help determine the shelf life and stability of medications and chemicals. In nuclear physics, it is used to calculate the amount of time it takes for radioactive elements to decay, which is crucial for understanding nuclear reactions and developing nuclear energy. Additionally, the half-life speed of carbon-14 is widely used in radiocarbon dating to determine the age of archaeological artifacts and fossils.