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## Main Question or Discussion Point

Hello!

I am not sure how I would go about calculating the time it takes for a radioactive element to decay to safe levels. I know of the decay formula (N=No*e^(-kt)) and K =ln2/t(1/2). I believe calculating the time until an atom has decayed to safe levels has to do with the activity (Bq) A=kN of the element. However, I do not have confirmation on this.

Take, Cesium 137 for example. It has a half life of 30 years. However, I would like to create a general formula for x kg of this element to decay to 'safe' levels.

Thanks,

Trontor

I am not sure how I would go about calculating the time it takes for a radioactive element to decay to safe levels. I know of the decay formula (N=No*e^(-kt)) and K =ln2/t(1/2). I believe calculating the time until an atom has decayed to safe levels has to do with the activity (Bq) A=kN of the element. However, I do not have confirmation on this.

Take, Cesium 137 for example. It has a half life of 30 years. However, I would like to create a general formula for x kg of this element to decay to 'safe' levels.

Thanks,

Trontor

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