Radiant energy – Radiant energy generation and sources – With radiation modifying member
Patent
1974-12-26
1976-08-03
Dixon, Harold A.
Radiant energy
Radiant energy generation and sources
With radiation modifying member
250267, 250270, G21G 402, G01V 500
Patent
active
039731316
ABSTRACT:
Disclosed is a system for nuclear well logging in which neutron pulse time duration for a high energy neutron generator and the frequency of pulses are selected downhole in the tool by use of a coded signal transmitted by the cable from the earth's surface. Separate channel systems are provided in the downhole tool for desired neutron pulse width and repetition frequency and are operated by a decoder system. Additionally, the accelerator voltage on a high energy neutron generator is controlled by a downhole switching system to selectively obtain different neutron output in response to coded signal transmissions. Moreover, provisions for obtaining different timing pulses to control gates for sampling signals generated in the tool are provided.
REFERENCES:
patent: 2820896 (1958-01-01), Russell et al.
patent: 2991364 (1961-07-01), Goodman
patent: 3215836 (1965-11-01), Frey
patent: 3461291 (1969-08-01), Goodman
Langford Obie M.
Malone Steve G.
Beard William J.
Dixon Harold A.
Ries C. G.
Texaco Inc.
Whaley T. H.
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