Exposure is defined only for gamma or x-rays in air, not tissue. Please refer to the Glossary for additional clarification of these terms. A s R easonably A chievable. Time, Distance, Shielding Radiation doses may be reduced by taking advantage of time, distance, and shielding. This is also known as the Inverse Square Law.
Shielding can be very effective in reducing the dose received.
There are different types of shielding for different types of radiation. Use caution when selecting shielding to reduce the radiation dose. The dose may actually increase by selecting the wrong shielding. Health Physics normally does not provide shielding to researchers. However, staff members are available to answer general shielding questions and discuss the efficacy of shielding materials.