Gamma ray prospecting system
First Claim
1. Means for distinguishing full energy absorption peaks received across an energy band from background energy at a particular physical location comprising:
- (a) means for receiving a gamma ray energy spectrum of radiation,(b) means for distinguishing the peak energy level within an energy band of said spectrum, and for integrating said energy within said band,(c) means for distinguishing a statistical value of the background gamma radiation within said band, and for integrating the background radiation within said band,(d) means for subtracting the integrated statistical value of background energy from the integrated peak energy, and(e) means for providing an output signal representative of the difference of the integrated peak energy level and said integrated statistical value within said band, to provide an indication of the presence of radiation emissive mineral at said particular location.
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Abstract
A means and method for distinguishing full energy absorption peaks from background energy in a gamma ray prospecting system. Photopeaks in the received energy spectrum are determined, and boundaries to the peaks are located. The energy within the boundaries assuming a predetermined curve between the boundaries is integrated. The filtered energy within the actual photopeak curve is also integrated, and the two integrated signals are subtracted to provide a signal representative of the net photopeak area or amplitude. This peak area (or amplitude) is directly proportional to intensity of gamma radiation due to uranium, thorium and potassium in the ground. This signal is displayed and continuously updated on a cathode ray tube as a function of time.
13 Citations
18 Claims
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1. Means for distinguishing full energy absorption peaks received across an energy band from background energy at a particular physical location comprising:
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(a) means for receiving a gamma ray energy spectrum of radiation, (b) means for distinguishing the peak energy level within an energy band of said spectrum, and for integrating said energy within said band, (c) means for distinguishing a statistical value of the background gamma radiation within said band, and for integrating the background radiation within said band, (d) means for subtracting the integrated statistical value of background energy from the integrated peak energy, and (e) means for providing an output signal representative of the difference of the integrated peak energy level and said integrated statistical value within said band, to provide an indication of the presence of radiation emissive mineral at said particular location. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Means for distinguishing full energy absorption peaks received across an energy band from background energy at a particular physical location comprising:
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(a) means for receiving a gamma ray energy spectrum of radiation, (b) means for distinguishing full energy absorption peaks of said received energy, (c) means for filtering the received energy, (d) means for defining a lower and an upper filtered spectrum window boundary of at least one of said peaks, (e) means for determining the amplitude of the energy at said boundaries, (f) means for integrating the energy between said boundaries, with a predetermined energy change between the energy amplitudes at said boundaries, to obtain a signal representative of the background energy, (g) means for integrating the filter-d energy amplitude between said boundaries, to obtain a total photopeak area signal, and (h) means for subtracting the signal representative of the background energy from the total photopeak area signal to obtain a signal representative of the net photopeak area within the spectrum window. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for distinguishing full energy absorption peaks across an energy band from background energy comprising:
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(a) receiving an energy spectrum signal at least within the energy band to be distinguished, (b) filtering the signal, (c) defining at least one of said peaks, (d) defining upper and lower spectrum boundaries to said one peak, (e) determining the amplitudes of said filtered signal at said boundaries, (f) assigning a predetermined change in amplitude of said filtered signal between said amplitudes of said filtered signal, (g) integrating the signal between said boundaries from said amplitudes and predetermined change in amplitude to obtain a signal representative of background energy, (h) integrating the filtered signal between said boundaries to obtain a signal representative of total photopeak area, (i) subtracting the background energy signal from the total photopeak area signal to obtain a net photopeak signal. - View Dependent Claims (15, 16, 17, 18)
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Specification