Thrush occurs in children and adults when conditions permit too much growth of a fungus called candida in your mouth. A small amount of this fungus normally lives in your mouth. It is most often kept in check by your immune system and other germs that also live in your mouth. When your immune system is weak or when normal bacteria die, too much of the fungus can grow. You are more likely to get thrush if: You are in poor health.
The rate at which a radioactive isotope decays is measured in half-life. The term half-life is defined as the time it takes for one-half of the atoms of a radioactive material to disintegrate. Half-lives for various radioisotopes can range from a few microseconds to billions of years. See the table below for a list of radioisotopes and each of unique their half-lives. Radioisotope.
Instructions. Find the expression for the half-life t(half) of a radioactive sample. It is the time it takes for half of the amount of the nuclei in a sample to decay.The half-life is related to the decay constant lambda, which has a value dependent on the sample's material.The formula is t(half) = ln 2 / lambda = 0.693 / lambda.nother unit is the curie, which is equal to 3.7 x 10 exp (10) Bq. Practice calculating the radioactive decay. Radium-226 has a half-life of 1,600 years. Calculate the activity of a one gram sample, where N = 2.66 x 10 exp(21). To do this, first find lambda. Simultaneously, convert the half-life from years to seconds.