radiobiology study type low dose radiation study type A study of the biological effects of low acute or protracted doses of ionising radiation defined as being below 500 mSv, less than 100mGy, or at dose rates less than 5mGy per hour. ( https://www.nationalacademies.org/our-work/developing-a-long-term-strategy-for-low-dose-radiation-research-in-the-united-states)