Premium
Liquid ionography for diagnostic radiology
Author(s) -
Fenster A.,
Johns H. E.
Publication year - 1974
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.1637305
Subject(s) - electric field , electrode , materials science , radiation , photon , dosimetry , optics , tin , foil method , absorbed dose , resolution (logic) , analytical chemistry (journal) , atomic physics , nuclear medicine , physics , chemistry , medicine , chromatography , metallurgy , composite material , quantum mechanics , artificial intelligence , computer science
In liquid ionography the x‐ray photons are absorbed in a liquid containing a high‐atomic‐number atom, such as tetra‐methyl‐tin. The liquid is contained between two parallel electrodes separated by a few millimeters. Most of the ions produced in the liquid recombine. Those that escape recombination are collected on an insulating foil covering one of the electrodes. The resulting charge pattern is rendered visible using powder‐cloud development. For a 4‐mm electrode separation and using 45‐kVp x rays, about 98% of the radiation is absorbed; for 105‐kVp x rays, about 88% of the radiation is absorbed. We studied the sensitivity of a 4‐mm chamber as a function of the applied electric field and found that, for 65‐kVp x rays and an electric field of 70 kV/cm, the sensitivity is 1 nC/cm 2 ‐mR. We present an image of a test pattern with a resolution of better than 10 1p/mm produced by this system.