Radioactive Isotopes: Different Activity Rates Explained

  • Context: Undergrad 
  • Thread starter Thread starter FlipStyle1308
  • Start date Start date
  • Tags Tags
    Isotopes Radioactive
Click For Summary

Discussion Overview

The discussion revolves around the activity rates of different radioactive isotopes, specifically whether two samples containing different isotopes can have the same activity. Participants explore the implications of decay rates and sample purity in this context.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant asserts that it is not possible for two samples containing different radioactive isotopes to have the same activity due to differing decay rates.
  • Another participant questions whether the samples are pure or mixed with inert isotopes, suggesting that this could affect the activity rates.
  • A participant clarifies that they are referring to pure samples and seeks to understand the conditions under which different isotopes might have the same activity.
  • It is proposed that while different isotopes typically have different decay rates, it is conceivable to prepare two samples with identical activity at a specific moment by varying the quantities of the isotopes.
  • However, it is noted that these samples would not maintain identical activity over time due to differences in their decay rates.

    • Areas of Agreement / Disagreement

    Participants express differing views on the possibility of two samples with different isotopes having the same activity, with some proposing that it can occur under specific conditions while others maintain that it is generally not possible.

    Contextual Notes

    Assumptions about sample purity and the definition of activity are not fully resolved, and the discussion does not clarify the implications of varying quantities of isotopes on activity over time.

FlipStyle1308
Messages
264
Reaction score
0
I just want to make sure I just formulted a valid statement:

Two samples contain different radioactive isotopes. It is not possible for these samples to have the same activity because each isotope radioactive isotopes change their composition at different rates.

Anyone able to agree with this statement or counter it, saying why it is possible for these samples to have the same activity?
 
Physics news on Phys.org
Are the samples pure, or are (for instance) the radioactive isotopes mixed with inert isotopes?
 
I think I'm just talking about pure samples lol. Basically I just needed to make a statement on whether or not it's possible for two samples containing different radioactive isotopes to have the same activity and explain a bit.
 
It is conceivable that there are pairs of isotopes with identical decay rates.

Regardless, for any two isotopes, it should nonetheless be possible to prepare two samples with identical activity (at a given moment) just by having different quantities.

These won't maintain identical activity, since the little sample is burning up quickly whilst the big slowly-decaying (longer half-life) sample will maintain its rate much longer.

Uh.. FlipStyle, aren't you concerned your instructor / peers will see this site?
 
Last edited:

Similar threads

Undergrad Understanding radioactivity levels of different isotopes
  • · Replies 14 ·
Replies
14
Views
3K
High School Can alpha radiation make other materials radioactive?
  • · Replies 9 ·
Replies
9
Views
5K
Undergrad What Are the Complexities of Radioactive Isotopes in Nuclear Chemistry?
  • · Replies 6 ·
Replies
6
Views
2K
High School Why does the nucleus become unstable as the number of nucleons increases?
  • · Replies 12 ·
Replies
12
Views
5K
Undergrad Nucleus energy levels, neutron energy
  • · Replies 15 ·
Replies
15
Views
4K
Undergrad What is the validity of half lives being constant in all radioactive isotopes?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Creating a new compound (involving K,Ca,H,N). Is it possible?
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Neutrino-Nucleus Interactions and Half-Life Constraints
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Converting measured activity between isotopes
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Liquid Scintillation Counting: External source to determine efficiency
  • · Replies 3 ·
Replies
3
Views
4K