Isotope-specific detection of low-density materials with laser-based monoenergetic gamma-rays.

What we believe to be the first demonstration of isotope-specific detection of a low-Z and low density object shielded by a high-Z and high-density material using monoenergetic gamma rays is reported. The isotope-specific detection of LiH shielded by Pb and Al is accomplished using the nuclear resonance fluorescence line of L7i at 478 keV. Resonant photons are produced via laser-based Compton scattering. The detection techniques are general, and the confidence level obtained is shown to be superior to that yielded by conventional x-ray and gamma-ray techniques in these situations.

Dermatological management of human immunodeficiency virus (HIV).

Atypical presentations of typical dermatological conditions are common in human immunodeficiency virus (HIV). This article will focus on three specific topics: eosinophilic folliculitis, psoriasis, and cutaneous mycoses. Their unique presentations in HIV and treatments are discussed.