What is the half-life time for thorium?
about 14 billion years
The time required for a radioactive substance to lose 50 percent of its radioactivity by decay is known as the half-life. The half-life of thorium- 232 is very long at about 14 billion years.
What is the half-life of thorium 238?
14.05 billion years
Th is one of the two nuclides beyond bismuth (the other being 238U) that have half-lives measured in billions of years; its half-life is 14.05 billion years, about three times the age of the earth, and slightly longer than the age of the universe.
What is the half-life of thorium 235?
Twenty-seven thorium radioisotopes have been characterized, with a range in atomic weight from 210 to 236. All are unstable with the most stable being 232Th with a half-life of 14.05 billion years.
What is the half-life of thorium in this example?
14 billion years
In the case of thorium-232, for example, radioactive decay proceeds so slowly that 14 billion years must elapse before one-half of an initial quantity decayed to a more stable configuration. Thus the half-life of this isotope is 14 billion years.
What is the half-life of thorium-234?
24.1 days
Thorium-234 (half-life = 24.1 days) was first measured in the oceans in the late 1960’s by Bhat et al.
Which isotope of thorium has the longest half-life?
Thorium-232
) is the main naturally occurring isotope of thorium, with a relative abundance of 99.98%. It has a half life of 14 billion years, which makes it the longest-lived isotope of thorium. It decays by alpha decay to radium-228; its decay chain terminates at stable lead-208.
What is thorium-230 Halflife?
Thirty-one radioisotopes have been characterized, with the most stable being 232Th, 230Th with a half-life of 75,380 years, 229Th with a half-life of 7,917 years, and 228Th with a half-life of 1.92 years.
How do you calculate the half-life of thorium?
Solution : Let initial mass of thorium =`N_0` If in time t 20% of the thorium is disintegrated then, the amount of thorium that disintegrates `=N_0xx20/100=0.2N_0` Amount of thorium left, `N=N_0-0.2 N_0 = 0.8 N_0` Now, `N=N_0e^(-lambdat)` or , `e^(lambdat ) = N_0/N=N_0/(0.8N_0)`=1.25 …
How do you calculate the half-life of a drug?
The half-life (t1/2) is the time it takes for the plasma concentration of a drug or the amount of drug in the body to be reduced by 50%. The half-life of a drug can be determined using the following equation: t1/2 = (0.7 x Vd) / Cl, where Vd is volume of distribution and Cl is clearance.
