An experimental investigation of the behaviour of a spherical ionization cum vacuum chamber

A spherical chamber used in an experimental study of the saturation characteristics of an irradiated vacuum chamber and an ionization chamber is described. The measures adopted to minimize the distortion of the radial field in the instrument and to maintain a vacuum of 10 μtorr are outlined. The results obtained from the use of the apparatus are presented and critically discussed in the light of recent work in this field.

[1]  T. E. Burlin,et al.  Measurement of the Emission of Low-energy Electrons in an Irradiated Vacuum Cavity Chamber , 1964, Nature.

[2]  T. E. Burlin,et al.  Saturation Characteristics of a Spherical Ionization Chamber and a Determination of Boag's Constant for Air , 1964, Nature.

[3]  T. E. Burlin,et al.  Electron Transfer in Irradiated Vacuum Cavity Chambers , 1964, Nature.

[4]  J. Greening.  Saturation Characteristics of Parallel-Plate Ionization Chambers , 1964 .

[5]  T. E. Burlin.  The limits of validity of cavity ionization theory. , 1962, The British journal of radiology.

[6]  L. Kemp,et al.  The basic design data of a guarded-field thimble ionization chamber: a precision ionometric investigation. , 1958, Physics in medicine and biology.

[7]  L. Kemp,et al.  Guarded-Field Thimble Ionization Chambers , 1957, Nature.

[8]  L. Kemp.  Guarded-Field Ionization Chambers: a New Principle applied to both Free-Air and Thimble Versions , 1956, Nature.

[9]  F. T. Farmer,et al.  Insulators for radiological instruments. , 1956, The British journal of radiology.

[10]  F. H. Attix,et al.  A theory of cavity ionization. , 1955, Radiation research.

[11]  J. Fowler,et al.  Conductivity Induced by X-Rays in Polyethylene Terephthalate: A Possible Insulator for Radiological Apparatus , 1955, Nature.

[12]  F. T. Farmer,et al.  Conductivity induced in Polystyrene by X-Rays , 1954, Nature.

[13]  J. Greening.  A contribution to the theory of ionization chamber measurements at low pressures. , 1954, The British journal of radiology.

[14]  C. W. Wilson.  Observations on the ionization produced by radium gamma rays in air-walled ionization chambers at low gas pressures. , 1954, The British journal of radiology.

[15]  J. Boag,et al.  The saturation curve at high ionization intensity , 1952 .

[16]  L. Taylor.  The measurement of X and gamma radiation over a wide energy range. , 1951, The British journal of radiology.

[17]  R. Sievert.  Determination of Ionisation in Biological Objects , 1940 .

[18]  L. H. Gray.  An Ionization Method for the Absolute Measurement of γ-Ray Energy , 1936 .

[19]  G. Mie.  Der elektrische Strom in ionisierter Luft in einem ebenen Kondensator , 1904 .