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i am beginner in the field of radioactivity and I have a problem to solve , however I would like your help. I have to calculate half life time of element and I have the activity values ( 400,200, 100 MBq)  and time points (5,4,3 min) .I would like to ask you how I can calculate the half life time with these values. should I use the formula A=Ao e-λt   ??

Do you know the meaning of λ in this formula and how it is related to the half-life?

Is that formula really necessary? Observe the data. 400 - 200 - 100 MBq and 3min - 4min - 5min, does that ring a bell?

I realize that i am about a year late to the party, just want to add some information for anyone that finds this thread in the future.
where λ is the probability of decay per second and HL is half life in seconds.
dN/dt=-λN this basically means the rate of decay is defined by probability of decay times amount of material present.

solution to this equation is exponential.

in the experiment one measures rate of decay at different time values.
Plot would be a falling exponential.
If one takes natural log of the decay rate the resulting graph is a linear function, the slope of which is λ.
At this point one can calculate half life from λ=ln(2)/HL by solving for HL.


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