Two workers oversee the emplacement of the canister that contained the chemical explosive charge for Source Physics Experiment-4 Prime at the Nevada National Security Site. Courtesy/LLNL
HSNW News:
Three weeks ago, a National Nuclear Security Administration (NNSA) led-team successfully conducted the fourth in a series of experiments designed to improve the U.S. ability to detect underground nuclear explosions.
The Source Physics Experiment (SPE-4 Prime) is a fundamental step forward in the U.S. effort to improve arms control verification, and will eventually be used to assure compliance Read More


















