Unit 1 Fundamental Concepts 1-11 Practice Exercise 4. Cosmic radiation and radioactive potassium in the body are examples of _________________. 5. The roentgen (R) is a unit of ______________________. 6. The roentgen per hour (R/hr) is a unit of ____________________. BIOLOGICAL EFFECTS OF RADIATION Nuclear radiation is the most-studied environmental hazard in the world. The effects on people caused by exposure to very large amounts of radiation is well known. In this section, you will learn about the biological effects of very large radiation doses received in a relatively short period of time. An exposure received within a short period of time is called acute exposure . Generally, a large acute exposure can result in observable effects, such as radiation sickness or death, shortly after exposure. The severity of these immediate effects depends on the amount of radiation dose. Large acute exposures can also result in effects such as cancer that show up after a number of years. The probability of these delayed effects also depends on the amount of radiation dose. A continuous or repetitive exposure is called a
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