LOW-FREQUENCY NMR POLARIMETER FOR HYPERPOLARIZED GASES

An inexpensive and self-contained apparatus for pulsed NMR at 30-250 k Hz is described. The intended application is monitoring of the spin po larization of rare gas nuclei in a laser-polarizing apparatus in field s of order 30 G, In addition, the device provides a convenient method for following the polarization decay during storage and transport, Som e of the features are a flexible pulse generator, splitting of transmi tter RF cycles by the RF gate, a Q switch, and a wide range of receive r gains. (C) 1998 Academic Press.