10. Cesium-137 has a half-life of about 30 years. Is it normal that after more than 20 years, levels of
radioactivity in the ground near Chernobyl are still very high? Explain your answer.
/2 marks
There is still more than 1/2 of the original amount of cesium in the environment because it has been less than one half life ...so levels if high to begin with, are still high.
