Radioactive Phosphorus in the Diagnosis of Gastrointestinal Cancer W. Vogel & M. Büttner GmbH Both conventional procedures and recent 70174 Stuttgart Both conventional procedures and recent innovations are reported optical interference continues to be of great importance in areas such as spectroscopy and metrology Any aid which will give even a small amount of positive information to tip the balance for or against the diagnosis of cancer in an obscure situation must be considered of value to the gastroenterologist ) and a miniature Geiger counter to record the differences in beta emission over tumors as compared to normal tissue now appears clinically useful in the diagnosis of gastrointestinal malignancy where the organ is available for such instrumentation