Asked by Sara

The activity of a stock isotope is 10,000 DPM/0.10mL. If 0.25 ml of this stock is placed in 2.50 ml of water, what is the activity in the diluted specimen?

My guess is that I just multiply the 10,000 DPM by the 1/10 dilution factor. I then come up with 1,000DPM/0.10ml. Does this sound right? I am very confused
Answered by DrBob222
1000 is right.
Answered by DrBob222
To make this clear, the DPM is 1000/0.01 mL