Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Reexamination Certificate
2005-04-26
2005-04-26
Porta, David (Department: 2878)
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
C252S301170, C523S136000
Reexamination Certificate
active
06884994
ABSTRACT:
The present invention provides scintillation material having good stability at continuous operating temperatures of at least 175° C. The scintillation material includes a cross linked copolymer with improved aromatic character that form a host plastic having properties of a thermoset polymer. The host plastic contains a primary fluorescent agent and a wavelength shifter. Preferably, the copolymer is comprised of a styrene derivative such as, for example, p-t-butylstyrene, and a higher melting point compound such as, for example, 4-vinylbiphenyl. In accordance with one aspect of the present invention, the scintillation material possesses properties of: good mechanical properties at high temperature (e.g., a Tg of about 180° C.); excellent light output (e.g., energy transfer efficiency); high hydrogen content for fast neutron detection; good optical transparency; and stable operation at temperature.
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Busser Catherine Danielle Marie
Durner, Jr. Edward F.
Simonetti John J.
Ziegler Wolfgang Peter
Batzer William B.
DeStefanis Jody Lynn
Polyzos Faye S.
Porta David
Schlumberger Technology Corporation
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