The time taken for a radioactive element to reduce to 50% of its original weight is _____________ years, if its half life period is 12 years? March 5, 2019 – by admin The time taken for a radioactive element to reduce to 50% of its original weight is _____________ years, if its half life period is 12 years? A. 24B. 18 C. 6 D. 36