Biologists struggle with push to eliminate radioactive caesium in labs

Anybody who wants to conduct experiments on mice in Margaret Goodell’s immunology lab must submit to a host of security measures, starting with a background check by the FBI. That’s because Goodell, a researcher at Baylor College of Medicine in Houston, Texas, uses a caesium-based irradiator to destroy bone marrow in mice that are set to receive stem-cell transplants. The US government fears that the radioactive caesium could be stolen to make a ‘dirty’ bomb.

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