A total of 71 air samples were collected in Hong Kong area from November 2001 to February 2003 using a highvolume air sampler and a high-volume cascade impactor with five atmospheric pressure stages. The Be radioactivity on each stage was measured using a high-efficiency germanium gamma-ray spectrometer. From the radioactivity of stages, the total airborne Be radioactivity was determined. The a...

The chemical element krypton, whose principal source is the atmosphere, had a long-lived radioactive content, in the mid-1940s, of less than 5 dpm per liter of krypton. In the late 1940s, this content had risen to values in the range of 100 dpm per liter. It is now some hundred times higher than the late 1940 values. This radioactivity is the result of the dissolving of nuclear fuel for militar...

The present author has kept observation for concentrations of atmospheric radon, radon progeny and thoron progeny for several years at the campus of Fukushima Medical University. Accidentally, in the midst of an observation term, i.e., February 2005, the facility management group of the university changed a strategy for the manner of ventilation, probably because of a recession: (I) tidy everyd...

This article suggests that the 0.5K stagnation in the global-mean surface temperature (GST) between 1945 and 1976 would be due to the atmospheric nuclear explosions, namely, Gadget, Little Boy, Fat Man and the succeeding at least 422 times nuclear weapons testing between 1946 and 1980. Estimation on GST drop due to the atmospheric nuclear explosions based on the published numerical simulation r...