The lifetime of the 2 3Po2 level in He-like 58Ni has been measured using the beam-foil time of flight technique with single- as well as two-foil targets at various beam energies. This technique disentangles contributions arising from the H-like M1 and the Li-like M2 lines and yields a lifetime for the 2 3Po2 level in He-like 58Ni (70 ± 3 ps) in good agreement with previous theoretical (70.6 ps) and experimental (70 ± 3 ps) values.
Formation of doubly positively charged diatomic ions of Mo 2 2+ produced by Ar + sputtering of an Mo metal surface Resonance ionization spectroscopy investigations of electronic processes during ion-beam sputtering of metal atoms AIP Conf.A facility for lifetime measurement of metastable states in highly charged ions using the beam-foil technique with a single-foil and a two-foil target has been developed. In the two-foil technique, one foil moves with respect to the other and the option of varying the thickness of the fixed foil online has been implemented. A holder with multiple foils is used as a fixed target, and moved along x, y, and , the angle of rotation with respect to beam direction along the z axis. Using this facility, the He-like 1s2p 3 P 2 o and Li-like 1s2s2p 4 P 5/2 o titanium lifetimes have been measured and compared with earlier values. In addition to this, the processes which occur when excited states collide with carbon foils of different thicknesses have also been investigated. Preliminary results suggest the scope of studying intrashell transitions during ion-solid collision using this setup. In this article, the setup is described in detail and representative results are briefly discussed.
High radon concentration in well water influences the indoor radon concentration when used as a domestic water supply. Radon levels were measured in indoor air and different tube-well water samples at the Nuclear Science Centre (NSC) premises. The ground-water from these tube-wells is used for drinking by the residents of the NSC premises. The radon concentrations in drinking water and the indoor air of the NSC premises were measured by using AlphaGuard. Radon levels recorded were more or less the same in all water samples and were found to vary from 1645Bq.m 3 to 3869Bq.m 3. Even when de-ionised, the radon concentration in the water was measured in the range from 1569Bq.m 3 to 2213Bq.m 3. The pH value of the water samples was also measured: no correlation was observed between radon concentration and the pH of the water samples. In addition, radon levels were also measured in some houses at the NSC premises using the same technique. The indoor radon level was found to vary from 3Bq.m 3 to 75Bq.m 3. The radon levels in kitchens and bedrooms were found to be slightly higher than those in other parts of the house. The indoor radon concentration was found to be highest at night and lowest in the afternoon. However, the measured radon levels in both the drinking water and the indoor air are well below the UNSCEAR recommended levels.
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