Radiant energy – Geological testing or irradiation – With drill or drilling
Reexamination Certificate
2011-03-08
2011-03-08
Porta, David P (Department: 2884)
Radiant energy
Geological testing or irradiation
With drill or drilling
C250S253000, C250S370110
Reexamination Certificate
active
07902495
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.
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Groves Joel L.
Liberman Arthur D.
Simonetti John
Stoller Christian
Ziegler Wolfgang
Flores Jonna
Fonseca Darla
Green Yara B
Porta David P
Rutherford Charlotte
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