The lung dose contributed from thoron (Rn) and its progeny was usually neglected in the dose assessment because of the generally low concentrations. Recently, increased concentrations of Rn and its progeny were measured in the traditional residential dwellings in China, in dwellings in India and in other countries. The potential alpha energy concentration contributed from Rn and its decay produ...

A region 140 square degrees toward the Galactic Centre was searched for monochromatic optical light, both pulses shorter than 1 sec and continuous emission. novel instrument constructed that acquires spectra of every point within 6 second, able to distinguish lasers from astrophysical sources. The system consists a modified Schmidt telescope, wedge prism over 0.28-meter aperture, fast CMOS came...

A simple method employing a pair of pancake-style Geiger-Mueller (GM) counters for quantitative measurement of radon activity concentration (activity per unit volume) is described and demonstrated. The use of two GM counters, together with the basic theory derived in this paper, permit the detection of alpha particles from decay of 222 Rn and progeny ( 218 Po , 214 Po ) and the conversion of th...

Stem cells are clonogenic cells with self-renewal and differentiation properties, which may represent a major target for genetic damage leading to prostate cancer and benign prostatic hyperplasia. Stem cells remain poorly characterised because of the absence of specific molecular markers that permit us to distinguish them from their progeny, the transit amplifying cells, which have a more restr...