Design Space for rtGs 100 Nuclear reactors d104 5-Year Design Life 10 Chemical The 87-year half-life of Pu-238 results in 96% of the original heat output even after five years Sola Radioisotopes 10 1HOUR 1 DAY 1 MONTH 1 YEAR 10 YEARS Duration of useDesign Space for RTGs 5-Year Design Life % of Original Power Years 50 0 100 1 10 87 The 87-year half-life of Pu-238 results in 96% of the original heat output even after five years Electric - Power Level (kW) Duration of Use 10 MIN 1 HOUR 1 DAY 1 MONTH 1 YEAR 10 YEARS Chemical 10-1 100 101 102 103 104 105 106 107 Radioisotopes Nuclear reactors Solar