The ²³⁸U series can be used to date minerals containing uranium by measuring the ratio of ²³⁸U to ²⁰⁶Pb, but all of the decay products have to remain in the mineral through several of their half-lives so that essentially all the ²³⁸U that decays become ²⁰⁶Pb. One of the decay products in this series is the noble gas, ²²²Rn. How would the experimentally determined age of the mineral be affected if some of the radon diffused from the rock?