In your case, you know that thorium-234 has a half-life of
24 days
. That means that every 24 days, half of the atoms of thorium you have in your sample will decay. This is of course equivalent to saying that every 24 days, you'll be left with half of the atoms of thorium you have in your sample.
How long would it take a 20 g sample of thorium-234 to decay into only 5 grams of thorium-234?
For 20 g to decay into 5 grams, it would take ~
50 days
(actually 48.4 days).
What percent of thorium-234 remains after 60 days?
The amount of Thorium-234 left after 60 days is about
20%
.
How long will it take for 18.0 grams of RA 226 to decay to leave a total of 2.25 grams RA 226 has a half-life of 1600 years?
How long will it take for 18.0 grams of Ra-226 to decay to leave a total of 2.25 grams? Ra-226 has a half-life of 1600 years. This decay process takes
4800 years
to occur.
How long would it take for half of a sample of uranium 238 to undergo decay?
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 long will it take for 28 grams of the original thorium-234 to decay?
In your case, you know that thorium-234 has a half-life of
24 days
. That means that every 24 days, half of the atoms of thorium you have in your sample will decay.
What percentage of an iodine-131 sample remains after 16 days?
After another eight days pass (a total of 16 days or 2 half-lives), the sample will be
25% iodine-131
and 75% xenon-131.
How long will it take for 10 grams of carbon 14 to decay to 2.5 grams?
How long will it take for 10. grams of carbon-14 to decay to 2.5 grams? (carbon-14 half life =
5730 years
.)
How much will remain after 800 years?
After another 800 years (1600 years total), there would only be
25g remaining
.
What percent of a sample of CO 60 half-life 5 years will decay after 25 years?
| Element | Plutonium | Mass Number (A) | 243 | Half-life | 5 hours | Element | Carbon | Mass Number (A) | 14 |
|---|
What are the 5 types of radioactive decay?
The most common types of radioactivity are
α decay, β decay
How long will it take for 10% of a 1000 gram sample of uranium 235 to decay?
| Substance Use Half-life | carbon-14 archeological dating 5,715 years |
|---|
What are the 4 types of radioactive decay?
- Alpha Decay. 2 protons and 2 neutrons lost. Atomic number down by 2, atomic mass down by 4.
- Beta Decay. 1 neutron turns into a proton. Atomic number up by 1.
- Positron Emission. 1 proton turns into a neutron. …
- Gamma Decay. Due to a high energy nucleus, energy is given off and nucleus becomes stable.
What is the value of decay constant?
The time required for half of the original population of radioactive atoms to decay is called the half-life. The relationship between the half-life, T
1 / 2
, and the decay constant is given by
T
1 / 2
= 0.693/λ
.
What is the measure of radioactive decay rate?
The rate of decay is often referred to as the activity of the isotope and is often measured in
Curies (Ci)
, one curie = 3.700 x 10
10
atoms that decay/second. By knowing the amount of radioisotope and the activity of the sample, the rate constant can be determined.
What is the half-life of thorium 230?
The longer-lived of these trace isotopes include:
230
Th with a half-life of
75,380 years
which is a daughter product of
238
U decay;
229
Th with a half-life of 7340 years and
228
Th with a half-life of 1.92 years.
