![]() ![]() By extension, this experiment is a useful analogy to nuclear fission. Students are able to visualize what is meant by subcritical, critical, and supercritical mass. With the Critical Mass Demonstration, students gain a better understanding of critical mass and how a chain reaction can become uncontrolled. The salt never releases ionizing radiation, only visible light. ![]() However, the salt is not radioactive – either before or after heating in the demo. Other scientific supply companies may offer irradiated salt check with your normal supply sources.įrequently Asked Question: Is the irradiated salt safe to eat? The dose of radiation given to the salt was higher than FDA allows for this type of food the laboratory where it was irradiated does not meet USDA/FDA standards for food handling. Penn State University, Breazeale Reactor, phone 81 Be sure to keep it protected in a dark or opaque container. The light exposure causes some changes in the lattice, the electrons gradually return to their original energy states and the salt returns to its original white color. If the irradiated salt is exposed to sunlight or artificial light, it will gradually lose its coloration and turn back to white. (The flashes of light observed in our activity are a very crude representation of such a test.) Periodically, the dosimeter is tested to determine how much radiation exposure the worker has received. Filters are used in the badge to discriminate between alpha, beta, and gamma radiation. Such dosimeters contain substances (often LiF crystals) that are sensitive to ionizing radiation.
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