Primary Exercise Problem Statement You work for a company that processes nuclear isotopes. Your supervisor asks you to perform some decay calculations for various radioactive substances. Background Physics The following equation tells how much of a radioactive material is left after a given period of time: 0.693t A(t) Age Ti/2 The information required by the equation is the initial activity (A), the time elapsed since the initial activity was measured (t), and the half-life of the isotope (Tv2). In this form of the equation, both t and T/2 should be expressed in units of days. Examp You purchase 9.25 ?Ci (micro-curies) of phosporous 32 (P32), but it sits for 9 days before you get a chance to use it. How much of the original 9.25 uCi is left? The half life of the isotope P-32 is 14.26 days. A-(9.25 Ci) exp(-0.693(9 days) / (14.26 days) ) ~ 5.97 3.28 uCi has decayed away after 9 days). . Ci is still remaining (i.e., about . Data Your division in the company works with these isotopes: Actinium 227 Barium 140 Cesium 134 Iodine 132 Abbreviation Ac-227 Ba-140 Cs-134 I-132 Half-life 21.77 years 12.8 days 2.06 years 2.26 hours This information comes from the Environmental Health and Safety unit at the University of Washington. Primary Exercise Problem Statement You work for a company that processes nuclear isotopes. Your supervisor asks you to perform some decay calculations for various radioactive substances. Background Physics The following equation tells how much of a radioactive material is left after a given period of time: 0.693t A(t) Age Ti/2 The information required by the equation is the initial activity (A), the time elapsed since the initial activity was measured (t), and the half-life of the isotope (Tv2). In this form of the equation, both t and T/2 should be expressed in units of days. Examp You purchase 9.25 ?Ci (micro-curies) of phosporous 32 (P32), but it sits for 9 days before you get a chance to use it. How much of the original 9.25 uCi is left? The half life of the isotope P-32 is 14.26 days. A-(9.25 Ci) exp(-0.693(9 days) / (14.26 days) ) ~ 5.97 3.28 uCi has decayed away after 9 days). . Ci is still remaining (i.e., about . Data Your division in the company works with these isotopes: Actinium 227 Barium 140 Cesium 134 Iodine 132 Abbreviation Ac-227 Ba-140 Cs-134 I-132 Half-life 21.77 years 12.8 days 2.06 years 2.26 hours This information comes from the Environmental Health and Safety unit at the University of Washington