Radiation maps of ocean sediment from the Castle Bravo crater

On March 1, 1954, the United States conducted its largest thermonuclear weapon test in Bikini Atoll in the Marshall Islands; the detonation was code-named “Castle Bravo.” Radioactive deposits in the ocean sediment at the bomb crater are widespread and high levels of contamination remain today. One hundred thirty cores were collected from the top 25 cm of surface sediment at ocean depths approaching 60 m over a ∼2-km2 area, allowing for a presentation of radiation maps of the Bravo crater site. Radiochemical analyses were performed on the following radionuclides: plutonium-(239,240), plutonium-238, americium-241, bismuth-207, and cesium-137. Large values of plutonium-(239,240), americium-241, and bismuth-207 are found. Comparisons are made to core sample results from other areas in the northern Marshall Islands.

North Korean weapon test puts detente in doubt

Headline NORTH KOREA: Weapon test puts detente in doubt

North Korea weapon test signals impatience with talks

Headline NORTH KOREA: Weapon test signals impatience with talks

Plutonium segregation in glassy aerodynamic fallout from a nuclear weapon test

This work establishes a connection between bulk composition and plutonium incorporation in glassy aerodynamic fallout from a nuclear weapon test.

Analysis on the Measurement of Bullet Impact Coordinates with Use of Acoustic Array and Optical Detection Sensor

In order to establish a larger sensing area (10m×10m) and perform higher precision of the measurement system during barrel weapon test of vertical target dispersion, an optical detector is provided additionally in acoustic array to form a new measurement model, which does not only have the advantage of large sensing area, but also of higher precision. The paper presents and gives the measuring formula of the measuring model, and provides analysis on the measurement error. The simulation result showes that the errors of x and y Coordinates are 5mm and 15mm respectively.