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1 – The amount of time that is required for a radioactive substance to lose one-half its activity. Each radioactive substance has a unique half-life. Source: Department of Toxic Substance Control – California – USA.
2 – The time required for a pollutant to lose half its affect on the environment. For example, the half-life of DDT in the environment is 15 years, of radium, 1,580 years
