Second, the amount of losses you deduct can't exceed the amount of gambling income reported on your return. As a professional, if you have a gambling loss that exceeds your winnings, you cannot deduct the loss. Your tax loss from the business of gambling can exceed your gambling income but not your gambling loss. If it's your real job and you lose money, then you can deduct those losses, she said.
half-life. The time required for the activity of a given radioactive species to decrease to half of its initial value due to radioactive decay. The half-life is a characteristic property of each radioactive species and is independent of its amount or condition. The effective half-life of a given isotope is the time in which the quantity in the body will decrease to half as a result of both radioactive decay and biological elimination.
Different types of radioactive materials have different decay times, varying from fractions of a second to millions of years. Each radioactive material has a decay rate. The time that it takes for half of the radioactive atoms to decay is called a half-life. For example, the previously mentioned technetium-99m has a half-life of six hours which means that, starting with 100 percent, after six hours, we will have 50 percent left.