The radioactive isotope of cerium - 137 of weigh 8g was collected on 1st Feb. 2006 kept in
Channel: Doubtnut
Date: 2020-04-05

The radioactive isotope of cerium - 137 of weigh 8g was collected on 1st Feb. 2006 kept in a sealed tube. On 1st July, 2006, it was found that only 0.25g of it remained. The half life period of the isotope is: