Gaseous Radon-222 forms in soil. As it rises from the soil

Last updated: 8/5/2022

Gaseous Radon-222 forms in soil. As it rises from the soil, it can be trapped in basements below homes. This gas, an alpha emitter, decays into Po-218, once inhaled by people it can cause lung cancer. A sample of gas is tested for Rn-222. The 1/2 life of Rn-222 is 3.823 days. After 63 days the sample is found to contain 3.50×10-8 g of Rn-222. How many grams of Rn-222 were initially present? _________g How many grams of Po-218 have been formed? _________g