A Radioactive Decay Chain and the Spectrum Obtained by the INTEGRAL Observatory (image) Moscow Institute of Physics and Technology Share Print E-Mail Caption A radioactive decay chain and the spectrum obtained by the INTEGRAL observatory. Note the scale of the vertical axis -- about one gamma quantum an hour per 1cm2! Credit Nuclear Research Institute RAS Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.