Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Support of the Navy Dosimetry Program


The U.S. Navy uses thermoluminescent dosimeters (TLDs) to monitor personnel for radiation exposure.


Photo of DT702
Credit: Ronaldo Minniti/NIST

Since 2010, the entire Navy has adopted the model DT702 dosimeter, shown in the photograph, which has been demonstrated to have improved accuracy and energy discrimination and a lower detection limit than previous models. NIST has helped characterized this new dosimeter prior to its deployment and the results of this characterization have been published in the Radiation Protection Dosimetry Journal (T. J. St. John et al, Radiation Protection Dosimetry (2006), Vol. 120, No. 1–4, pp. 273–2). The newer technology combines the use of filters and four thermoluminescent elements enclosed in a rectangular shaped holder developed by Harshaw. The quantity of interest used for monitoring occupational exposure is the personal dose equivalent. NIST provides support to the Navy quality assurance program by irradiation and characterization of TLDs in the NIST reference standard 137Cs gamma-ray beams.

Created April 20, 2011, Updated October 22, 2018