gamma rays pose enough energy to remove electrons from atoms of absorbing material including human body and adversely affect human health. the external exposure of human beings to natural environmental gamma radiation normally exceeds that from all man-made sources combined. therefore, we monitored gamma dose rate in indoor environments and estimated corresponding annual effective dose in selec...

We have compared the efficiency of cell-killing, DNA single-strand breakage and double-strand breakage in an Escherichia coli K-12 wild-type strain after irradiation with soft X-rays (50kVp) and hard gamma-rays (600 keV) under aerobic conditions. Irradiation with 50 kVP x-rays resulted in 1.47 times more cell killing than was observed with 137Cs gamma-rays based on a comparison of D0 values eva...

Human whole-blood was exposed to 137Cs gamma-rays or 50 keV/microm carbon ions in the presence or absence of glycine betaine, a beer component in vitro. The dicentrics of chromosome aberrations in human lymphocytes were significantly (p < 0.05) reduced by glycine betaine after irradiation with 4 Gy of either gamma-rays or carbon ions. The maximum protection by glycine betaine for gamma-rays or ...

We examined the mechanisms by which two different types of photonic radiation, short wavelength UV (UV-C) and gamma radiation, activate transcription factor NF-kappaB. Exposure of mammalian cells to either form of radiation resulted in induction with similar kinetics of NF-kappaB DNA binding activity, nuclear translocation of its p65(RelA) subunit, and degradation of the major NF-kappaB inhibit...

OBJECTIVE To assess relative biological effectiveness (RBE) of (131)I radiation relative to (60)Co gamma rays in glioblastoma spheroid cells. MATERIALS AND METHODS : In this experimental study, glioblastoma spheroid cells were exposed to (131)I radiation and (60)Co gamma rays. Radiation induced DNA damage was evaluated by alkaline comet assay. Samples of spheroid cells were treated by radiati...