Measurement of the nuclear polarization of hydrogen and deuterium molecules using a Lamb-shift polarimeter.

Lamb-shift polarimeters are used to measure the nuclear polarization of protons and deuterons at energies of a few keV. In combination with an ionizer, the polarization of hydrogen and deuterium atoms was determined after taking into account the loss of polarization during the ionization process. The present work shows that the nuclear polarization of hydrogen or deuterium molecules can be measured as well, by ionizing the molecules and injecting the H2(+) (or D2(+)) ions into the Lamb-shift polarimeter.

[Calibration of a whole body counter using Monte Carlo methods].

Radioactive substances in the human body can be identified and quantified by gamma spectroscopy using whole body counters. Counting efficiencies needed for calculation of incorporated activities are generally determined from measurements of phantoms simulating shape and density of a human and filled with known activity concentrations. The Cologne whole body counter setup was simulated using the EGSnrc Monte Carlo code system.