one of several states of a chemical element differing only in the number of neutrons present in the nucleus.

learn more… | top users | synonyms

3
votes
2answers
103 views

What is the difference between the shapes of molecules with different isotopes

I'll explain my question on example of water molecule. Let us have three water molecules: normal water $H_2 O$, heavy water $D_2 O$ and semiheavy water $HDO$. Is there any difference between the ...
0
votes
1answer
44 views

With these two elements how can the isotope half-life be determined using first order kinetics?

With these two elements how can the isotope half-life be determined using first order kinetics? nobelium-259 half-life recorded @ 58 minutes fermium-253 half-life recorded @ 3 days Although I do not ...
0
votes
1answer
57 views

What is the half-life threshold for an isotope to be considered stable?

What minimum half-life an isotope should have to be considered stable?
2
votes
1answer
278 views

Is a free proton a positive Hydrogen-1 ion?

The Hydrogen-1 isotope is a form of hydrogen with 1 electron, 1 proton, and 0 neutrons. If that isotope were to lose its electron (thus being a Hydrogen-1 ion with a positive charge) what would be ...
0
votes
1answer
30 views

Does KI have to be a salt of stable I-127 isotope?

I was recently watching a TV show where some people exposed to radiation were asked to take KI. I googled for the information and discovered this and also the Wikipedia article. From what I read, I ...
1
vote
1answer
43 views

Different kinds of the same isotope

I apologize if this is an obvious question, but I can't find the answer anywhere. In this page: http://ie.lbl.gov/education/parent/U_iso.htm are listed the isotopes of Uranium. Some of them, for ...
1
vote
0answers
25 views

Quantum Mechanisms for Isotope Fractionation

Are there any quantum properties that would enable isotope fractionation? For example, atoms with odd versus even numbers of neutrons are fermions and bosons, respectively. Has any work been done ...
8
votes
1answer
1k views

Absolute isotope activity in a nuclear fallout

I've seen nice graph showing relative activity of each isotope in Chernobyl fallout: Could anyone suggest similar graph or raw data but for absolute isotope activity for the case of nuclear ...
1
vote
1answer
136 views

How to solve the Fukushima incident?

I am trying to find out if it is somehow possible to take all this nuclear material, put it in some type of gamma chamber or blast it with neutrons to change the uranium isotopes into something ...
0
votes
0answers
43 views

How do you determine the energy of an isotope?

How do you determine the energy of an isotope? I there a calculation for it? Sorry for the confusion
52
votes
3answers
35k views

Why can Hiroshima be inhabited when Chernobyl cannot?

There was an atomic bomb dropped in Hiroshima, but today there are residents in Hiroshima. However, in Chernobyl, where there was a nuclear reactor meltdown, there are no residents living today (or ...
3
votes
1answer
120 views

Why does the metastable form of Technetium-95 have a longer half-life than its most stable state?

I was looking at the isotopes of technetium page on Wikipedia recently, and it seems that the metastable ${^{95m}Tc}$ has a substantially longer half-life (61d) than its most stable state of ...
2
votes
1answer
52 views

Isotope exchange between heavy water and plastic container

It is known that pure heavy water will quickly get contaminated by light hydrogen atoms if exposed to air due to isotope exchange. Does the same thing happens when heavy water is stored in plastic ...
0
votes
2answers
2k views

Is it possible to speed up radioactive decay rates? [duplicate]

Possible Duplicate: Do some half-lives change over time? Would it be possible to considerably speed up the decay rate of an isotope? Considerably meaning more then a 1 or 2% increase in ...
19
votes
2answers
5k views

Why is technetium unstable?

Is there a simple account of why technetium is unstable? From the Isotopes section of Wikipedia's article on Technetium: Technetium, with atomic number (denoted Z) 43, is the lowest-numbered ...
3
votes
0answers
105 views

The force exerted by a ~10 Tesla magnet on a C13 isotope?

How much force would a ~10 Tesla magnet exert on a weakly magnetic C13 isotope? If I made a molecule of diamond with $N$ C13 atoms, how large would $N$ need to be for me to pull on it with something ...
4
votes
2answers
279 views

Is there a direct relationship between an isotope's neutron count and radioactivity?

In my textbook, it lists isotopes of Carbon: C-12, C-13, and C-14. It noted that C-14 is radioactive (C-12 and C-13 are not). Is there a direct relationship between the number of neutrons and an ...
3
votes
1answer
352 views

Unknown isotope

Problem description: The most common isotope of a single nucleus stripped of its electrons is accelerated through a potential difference of 1225V and fired horizontally into a B-field directed ...
1
vote
2answers
247 views

Is it viable to convert nuclear waste into safe isotopes?

I read that powerful pulsed lasers can change isotopes: J. Magill, et. al.: "Laser transmutation of iodine-129". Did anyone estimate what would be the energy costs to transmutate 1 kg of fission ...
4
votes
1answer
338 views

Dangerous dose of I-131?

I was searching a lot and could only find dosages for curing cancer and allowed emission, but no Iodine-131 dose that could be connected with increased thyroid cancer risk (like, 10mSv is the ...
1
vote
2answers
258 views

Isotope properties plotting tool?

I'm looking for something that will generate scatter plots comparing different properties of isotopes. Ideally I'd like some web page that lets me select axis and click go but a CSV file with lost of ...
10
votes
3answers
1k views

Why some nuclei with “magic” numbers of neutrons have a half-life less than their neighbor isotopes?

It's easy to find the "magic" numbers of neutrons on the diagrams of alpha-decay energy: 82, 126, 152, 162. Such "magic" nuclei should be more stable than their neighbors. But why some nuclei ...
7
votes
1answer
379 views

Obtaining isotope stability

For a given isotope, one can obtain the binding energy using the semi-empirical mass formula. For example, has a binding energy of 1782.8 MeV. From this information, how can the likelihood of the ...