Скачать или смотреть Nuclear Physics (Half-life and Activity) Past Exam Question - A Level Physics

I'm going to walk you through an exam question on nuclear activity and half life:

Caesium-137 is a radioactive byproduct from fission nuclear power stations. It has a half life of 30 years and emits beta radiation.
Complete the following reaction equation by entering the appropriate numbers in the boxes.
Show that the decay constant of caesium-137 is approximately 7x10^-10 s^-1.
Show that the initial activity of 1.0 kg of caesium-137 is approximately 3x10^15 Bq.
Explain why 1.0 kg of caesium-137, although it has an activity of 3x10^15 Bq, would be quite safe in a sealed metal box of thickness 1 cm.
When the activity of 1.0 kg of caesium has dropped to 1000 Bq (comparable to soil) it can be disposed of by mixing with soil and scattering on the ground. Calculate how long it takes for the caesium sample to reduce its activity from 3x10^15 Bq to 1000 Bq.










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