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The half life. After 1 half life 50 % of the substance is left. After 2 half lives 25 %. After 3 half lives 12.5 %. After 4 half lives 6.25 %. After 5 half lives 3.125 %.
Explanation: You could use this formula: Where Th = half-life. M. = the beginning amount. M = the ending amount. One example of how to use the equation: One of the Nuclides in spent nuclear fuel is U-234, an alpha emitter with a half-life of 2.44 x10^5 years. If a spent fuel assembly contains 5.60 kg of U-234, how long would it take for the ...
"15.2 days" is 4 HALF LIVES. A bit over 6*g of ""^222Rn will remain. If 4 half lives have elapsed, 1/2xx1/2xx1/2xx1/2 = 1/16 of the original quantity of ""^222Rn will remain. Thus 100*gxx1/16 = ??*g Even though radon is chemically rather inert (why so?), its short half life means that it is hazardously radioactive.
After six half lives there will be 2.3g of the isotope left. If we start with 150g of the isotope, after one half-life the quantity will diminish to (150g)/2 = 75g which is half the original quantity. This can be written mathematically as: 150g(1/2)^1 After the second half life: (75g)/2=37.5g =(150g)/4=(150g)(1/2)^2 After the third half life: (37.5g)/2=18.75g = (150g)/8=(150g)(1/2)^3 But now ...
Answer link. Actually all isotopes are radioactive Some are much more radioactive than others. The second law of thermodynamics states that everything goes from order to disorder. An atomic atom is a highly order structure. The second law states that all highly order structure with break apart and move towards disorder.
6.25g Note: I edited the question to use the half-life of plutonium-239 as the correct value of 24,100 years, not the value in the original question of 24,110 years, which I assume was a typo. Use the equation M_r = M_i xx (1/2)^n Where n is the number of half-lives M_r is the mass remaining after n half-lives and M_i is the initial mass of the sample to find n, the number of half-lives ...
Explanation: During radioactive decay, particles and energy called radiation are are released by atoms of the radioactive element. Radioactive decay is the term used to describe the process by which an unstable atom loses energy to its surrounding environment. With radioactive decay, the nucleus of the atom changes from a parent nuclide to a ...
"8 g" The nuclear half-life of a radioactive isotope tells you how much time must pass in order for half of the atoms present in an initial sample to undergo radioactive decay. In essence, the half-life tells you at what time intervals you can expect an initial sample of a radioactive isotope to be halved. In your case, iodine-131 is said to have a half-life of 8 days. This means that with ...
Radioactive decay can be used to date igneous rocks by assuming making some assumptions, finding the percentages of parent to daughter products and using experimentally determined half-lives. Start with the assumptions that the rock 1. started with 100% of the parent element, and 0% of the daughter element. 2, there has been no loss of the parent element due to erosion. 3. there has been not ...
Promethium (Pm) Europium (Eu) Iridium (Ir) (Synthetic) Iridium (Ir) (Synthetic, Metastable) Bismuth (Bi) Polonium (Po) Answer link. There are 38 radioactive elements.They either have no stable naturally occurring isotope, or else are entirely artificial as all artificial elements have no stable isotopes.