Alamo wearer of TLD (thermo-huminescent docimeter) gets a fresh capsule. These TLD capsules measure radioactive fallout, and are exchanged monthly, May 1972

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Photo credit: © PF-(usna) / Alamy / Afripics
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Keywords: .., agency, archives, documerica, environmental, environmentalprotectionagency, historic, history, nara:arcid=548998, national, protection, usa, usnationalarchives