[willrowland]

⁵⁵Cr decays by emitting a β- particle. This decay process has a half-life of 3.50 min. Answer the following questions about this process and report all answers to three significant figures.



1. Determine the initial activity (in dis/min) of a 6.64 mg sample of this isotope. Report your answer to three significant figures in scientific notation.

2. Determine the time (in min) that it takes for the activity of ⁵⁵Cr to decrease to 1.37×108 dis/min.

[chenbeier]

What the general formula for half life? And what is the general formula for decay of a reacton of 1. order.

[Enthalpy]

I just wonder how to produce that amount of a nuclide with short life. Injecting the precursor in a 1400MW_e nuclear reactor may suffice, but probably not. In a salted bomb, yes.