A magnetorheological fluid formulation comprising magnetizable particles dispersed in a multi-component liquid vehicle comprising an organoclay stabilization mixture. The device may be interfaced to a time-of-flight mass spectrometer. The tubing hanger has a lateral production flow passage that registers with a lateral passage in the tree. The AIR FILTERING FOLD SHEET is designed with dust pocket for household who have pets or newly painted rooms. The computer system is preferably provided with all bore hole coordinates and additional information such as bore hole diameter, especially in tabular form. Using the radiometry apparatus, the temperature at depth in the second organ tissue at the measurement site is measured to provide a corresponding temperature signal, and the ablation catheter is controlled in response to the temperature signal to maintain the temperature of the second organ tissue below a predetermined value that does not result in thermal trauma to the second organ tissue.