D Danniii New member Jun 20, 2009 #1 The half life of a radioactive isotope is 6 hours. It has an activity of 800 counts/second. What is the activity after two days? Its activity two days later would be 50 counts/second. But Why???
The half life of a radioactive isotope is 6 hours. It has an activity of 800 counts/second. What is the activity after two days? Its activity two days later would be 50 counts/second. But Why???
T the_gr8_1 New member Jun 20, 2009 #2 2 days= 48 hrs. No. of half lives = 48 / 6= 8 Therefore, Activity after 8 half lives would be 800 / 2^8 .
2 days= 48 hrs. No. of half lives = 48 / 6= 8 Therefore, Activity after 8 half lives would be 800 / 2^8 .
