Detection of magnetic nanoparticles in lymph nodes of rat by high T/sub c/ SQUID

We have proposed a Lymph-node detection system using a high T/sub c/ SQUID gradiometer and ultra-small particles. A rat was injected with a mixture of water diluted superparamagnetic particles. The lymph nodes containing particles were then extracted from the rat. The lymph node samples were measured by a SQUID gradiometer system. We have successfully measured the signal from the lymph node.