Method and apparatus for radiation detection in a high temperature environment

US7902495B2 · kind B2 · utility

Assignee

• SCHLUMBERGER TECHNOLOGY CORPORATION · US

Inventors

• John J. Simonetti · Hillsborough Township, US
• Joel L. Groves · Leonia, US
• Wolfgang Ziegler · Waldbronn, DE
• Arthur D. Liberman · Palo Alto, US
• Christian Stoller · Princeton Junction, US

Key dates

• Filing date: Dec 29, 2007
• Grant date: Mar 8, 2011
• Expiry date: Apr 6, 2029

Classification

• Technology area (CPC G): Physics
• CPC primary: G01T1/20
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A radiation detector operating at high temperatures is shown comprising a scintillating material for producing light when excited by incident radiation, a photocathode, and an electron multiplier. The photocathode is deposited directly onto the surface of the scintillating material that is oriented toward the electron multiplier. Depositing the photocathode directly on the surface greatly decreases photon loss which is a problem of prior art systems. In a preferred embodiment, a metal flange is hermetically sealed to the scintillating material and this is fusion welded to the electron multiplier to create a vacuum envelope. This invention is particularly useful in noisy environments such as downhole in a drilling operation.