1. Energy per Ion Pair
2. Friedlander G, Kennedy JW, Miller JM. Nuclear and Radiochemistry. 3rd ed. New York, NY: Wiley; 1981:55–67.
3. Cherry SR, Sorenson JA, Phelps ME. Physics in Nuclear Medicine. 3rd ed. Philadelphia, PA: Saunders; 2003:66.
4. Circular of the Bureau of Standards no. 583: