
#1
Sep2506, 06:09 PM

P: 1

In my assay of 50uL of 125Iinsulin I have 20,000 cpm at the expiry date. The half life of 125IInsulin is 60 days. So how can I calculate how many counts a 50uL sample of 125Ilabelled insulin would contained at 4 months past the expiry date?
cheers 



#2
Sep2506, 06:16 PM

Sci Advisor
HW Helper
PF Gold
P: 1,382

Count halflives.



Register to reply 
Related Discussions  
radioactive reactions halflife Decay ..physics 30  Introductory Physics Homework  3  
Determining halflife of a radioactive sample  General Physics  1  
Half Life of Radioactive Isotopes  High Energy, Nuclear, Particle Physics  1  
radioactive decay and finding half life  Calculus & Beyond Homework  10  
Radioactive isotope with a halflife of 48,000 years  Nuclear Engineering  9 