![]() What was the mass of phosphorus-32 one week before, when you were supposed to measure it?īeginning amount = ending amount * 2 (time / half-life)Ĥ) Hydrogen-3 or tritium as it is commonly called, has a half life of 12.32 years. ![]() (Luckily, in that intervening week, the sample was safely isolated and all safety rules and regulations regarding the proper handling of radioactive materials were strictly enforced.) You forget about this until 7 days later, you measure its mass to be 37 grams. 54821)ģ) Your professor tells you to measure a sample of phosphorus-32 (half life = 14.263 days). Half life = (time * log 2) / log (beginning amount / ending amount) 30103)Ģ) You measure the radioactivity of a substance, then when measuring it 120 days later, you find that it only has 54.821 % of the radioactivity it had when you first measured it. How much time will it take until only 10 grams remain?Įlapsed time = half life * log (beginning amount / ending amount) / log 2Įlapsed time = 87.51 * (log (100 / 10) /. There are four half life problems further down this page.ġ) You start with 100 grams of sulfur-35, which has a half life of 87.51 days. This calculator can solve half life problems whenever three of the four variables are known: ![]() ![]() The above formulas are used in calculations involving the exponential decay ![]()
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