The movement and partitioning of naturally occurring radionuclides in environmental systems can lead to bioaccumulation in organisms. This can lead to an increased exposure to people and the environment from ionising radiation. This presentation will present methods for measurement of actinium series radionuclides and uptake into Australian native species, including traditional food items. Implications for radiation dose to the environment, and to indigenous traditional land owners, for current and former uranium mine sites will be discussed.