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Americium-241 is used in some smoke detectors It is an alpha emitter with a half-life of 432 How long will it take in years for 31.0 of an Am-241 sample to decay?
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Does uranium 238 have the shortest half life?
The half life of 238U is 4,468.109 years; this is a very long halflife !
How long will it take half of a radioactive sample to decay?
The length of time depends on the element and isotope, but the point at which half of the sample has decayed is known as the half-life.
How many milligrams of a 15.0 mg sample of radium-226 remain after 6396 years if the half-life of radium-226 is 1599?
One sixteenth of a gram. 1st halflife- 1/2 gram 2nd, 1/4 3rd 1/8th 4th halflife, 1/16th
A sample of radioactive isotope has a halflife of 1 day how much of the original sample will be left at the end of the fourth day?
If a sample of radioactive material has a half-life of one week the original sample will have 50 percent of the original left at the end of the second week. The third week would be 25 percent of the sample. The fourth week would be 12.5 percent of the original sample.
How much of the original sample will be left at the end of the second day if a sample of radioactive isotope has a half life of 1 day?
Hi, Each half-life means the mass of the sample has decreased by 1/2 its mass. Thus; After 1 half-life, 1/2 the sample has decayed. After 2 half-lives 3/4 of the sample has decayed. Hope this helps.
What is the time needed for half of a sample of a radioactive isotope to break down to form daughter isotopes called?
halflife
How do you identify beta decay?
A sample of 187 rhenium decays to 187-omium with halflife of 41.6 billion years. If all 188 osmium are normalized isotopes.
The halflife of Na24 is 15 hours When there are 1000 atoms of Na24 in a sample a scientist starts a stopwatch The scientist stops the stopwatch at 45 hours there are atoms of Na24 rema?
125
How does the length of the half-life of the element correspond to the radioactivity of the element?
The length of time required for half of a sample of radioactive material to decay
How wdxrf works - x-ray fluoresence by panalytical instruments?
the x-ray from the tube make a excited on atoms of sample and in depend on kv and A the ray of sample come to colimator and after that its go to detectors the detector report some V to camputer and iterperetaited
Does uranium 238 have the shortest half life?
The half life of 238U is 4,468.109 years; this is a very long halflife !
A uranium235 sample starts with 200 atoms and 700 million years later there are 100 atoms What is the halflife of uranium235?
700 milliion years. The definition of half-life is the period of time during which one-half of the atoms of an element undergo decay into other elements.
Manganese-56 is a beta emitter with a half-life of 2.6 hour. What is the mass of manganese-56 ina 1 mg sample of the isotope after 10.4?
you do 10.4/2.6 to get 4. then you have to divide 56 by 4 half lives. 56/2/2/2/2= 3.5g
Why are CO2 detectors being used by the UK border agency?
CO2 (carbon dioxide) is present in the breath exhaled by the body. Sensitive CO2 detectors sample the air from inside trucks as they arrive from Europe. They can detect illegal immigrants hiding in the truck as the level of CO2 would be higher than it would be if people hadn't been in there breathing out CO2 for ages while the truck crossed The Channel.also they of couldn't of breathed with air for the the journey
How long will it take half of a radioactive sample to decay?
The length of time depends on the element and isotope, but the point at which half of the sample has decayed is known as the half-life.
How could you tell the difference between cobalt 60 a sample of radon 222 and a sample of bismuth 83?
Cobalt-60 has two gamma photopeaks at 1.17 MeV and 1.33 MeV. Radon-222 is an alpha emitter. Bismuth-83 is not a valid isotope. 83 is the atomic number of bismuth, but you need to know the atomic mass number. The nuclide with the longest half-life is bismuth-208, and it decays by beta+ decay.
How many milligrams of a 15.0 mg sample of radium-226 remain after 6396 years if the half-life of radium-226 is 1599?
One sixteenth of a gram. 1st halflife- 1/2 gram 2nd, 1/4 3rd 1/8th 4th halflife, 1/16th
