When uranium-238 decays it produces thorium-234 what is the decay process?
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When uranium-238 decays it produces thorium-234 what is the decay process?
alpha emission
Explanation: A nucleus of uranium-238 decays by alpha emission to form a daughter nucleus, thorium-234. This thorium, in turn, transforms into protactinium-234, and then undergoes beta-negative decay to produce uranium-234.
How long does it take uranium-238 to decay into thorium?
4.51 billion years
Uranium-238 has a half life of 4.51 billion years. This means that it would take billions of years for uranium-238 to decay into a ratio of half uranium-238 and half thorium-234. Uranium-235 (another naturally occurring isotope of uranium) has a shorter half life than uranium-238, that’s only ~700 million years.
How many years does it take for half of uranium-238 to decay into lead?
4.5 billion years
RADIOMETRIC TIME SCALE
| Parent Isotope | Stable Daughter Product | Currently Accepted Half-Life Values |
|---|---|---|
| Uranium-238 | Lead-206 | 4.5 billion years |
| Uranium-235 | Lead-207 | 704 million years |
| Thorium-232 | Lead-208 | 14.0 billion years |
| Rubidium-87 | Strontium-87 | 48.8 billion years |
What is the half-life of thorium-234?
24.1 days
Each decay has its own characteristic half-life. In the first step, uranium-238 decays by alpha emission to thorium-234 with a half-life of 4.5×109 years. This decreases its atomic number by two. The thorium-234 rapidly decays by beta emission to protactinium-234 (t1/2= 24.1 days).
When Uranium 234 undergoes alpha decay what particles are created?
thorium-230
Uranium-234 nuclei decay by alpha emission to thorium-230, except for the tiny fraction (parts per billion) of nuclei which undergo spontaneous fission.
What is the nuclear equation for the decay of uranium 238?
An example will show the use of this equation. For the decay reaction 238U → 234Th + 4He, the mass values for 238U and 4He are in Table 3.1; for 234Th it is 234.043 594.
What is the half-life of thorium 230?
75,380 years
The longer-lived of these trace isotopes include: 230Th with a half-life of 75,380 years which is a daughter product of 238U decay; 229Th with a half-life of 7340 years and 228Th with a half-life of 1.92 years.
Why do you have to use uranium-238 to measure the half-life of a rock?
The more lead the rock contains, the older it is. The long half-life of uranium-238 makes it possible to date only the oldest rocks. Also, the half-life of potassium-40 is only 1.3 billion years, so it can be used to date rocks as young as 50,000 years old.
How old would a sample with 50\% uranium 238 and 50\% lead 206 be?
After a second half-life, the 50 gm of U-238 would drop to 25 while the 50 gm of Pb-206 would increase to 75. Thus, two half lives. Since the half-life of U-238 is 4.5 Billion years, this rock must be 9 BY old. 1d.
What is the half-life of uranium 233?
160,000 years
It has a half-life of 160,000 years. Uranium-233 is produced by the neutron irradiation of thorium-232….Uranium-233.
| General | |
|---|---|
| Protons | 92 |
| Neutrons | 141 |
| Nuclide data | |
| Half-life | 160,000 years |
What is the half-life for thorium 230?
Thorium has a characteristic terrestrial isotopic composition and thus a standard atomic weight can be given. 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.
What is the half-life of uranium 214?
about 0.52 milliseconds
The researchers watched those nuclei decay and determined that the half-life of uranium-214 – the length of time until half of a given sample of particles has decayed radioactively – is about 0.52 milliseconds.
Uranium-238 decays to form thorium-234 with a half-life of 4.5 x 10^9 years. How many years will it take for 75\% of the uranium-238 to decay? 8 clever moves when you have $1,000 in the bank.
What is the half life of uranium-238?
Uranium-238 decays, just fairly slowly compared to most radioactive substances (half life is about 4.5 billion years). What makes a good nuclear fuel is not related to half life.
What is the half life of thorium 230?
This thorium in turn transforms into protactinium 234, and then undergoes beta-negative decay to produce uranium 234. This last isotope changes slowly (with a half-life of 245,000 years) into thorium 230, yet another unstable nucleus.
What is the product of the decay of uranium 238?
A nucleus of uranium-238 decays by alpha emission to form a daughter nucleus, thorium-234. This thorium, in turn, transforms into protactinium-234, and then undergoes beta-negative decay to produce uranium-234.