Which of the following methods would reduce exposure to ionizing radiation?

Using lead shields is a well-established method for reducing exposure to ionizing radiation. Lead is effective at absorbing radiation due to its high density, making it a common material in protective barriers used in medical and industrial settings. By placing lead shields between the radiation source and individuals, the amount of radiation that reaches them is significantly reduced.

Minimizing the duration of exposure is another important strategy for reducing radiation exposure. The longer an individual is exposed to a source of ionizing radiation, the greater the cumulative dose they receive. By limiting the time spent near the source, it is possible to decrease the overall exposure and lower the risk of harmful effects.

The combination of these two methods—using lead shields to block radiation and minimizing the time spent in environments where radiation is present—effectively decreases exposure risks. Therefore, the correct choice encompasses both the use of lead shields and the minimization of exposure duration, emphasizing a comprehensive approach to radiation safety.