Radioactive tracer profiling system and apparatus

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods

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250269, G01V 500

Patent

active

040073661

ABSTRACT:
A radioactive charge is ejected into the borehole and a subsurface unit including a radiation detector is moved upwardly through this charge a number of times. The total radiation count as the unit moves up through the charge is obtained by integrating the output of the radiation detector during the period when the counter output exceeds the background radiation. The integrated count is displayed on a digital display unit. Compensation is provided for background radiation within the borehole. Also correction is made for the dead time of the radiation detector so that an accurate indication of the total amount of radioactivity remaining in the borehole during successive runs is obtained.

REFERENCES:
patent: 2989631 (1961-06-01), Bohn
patent: 3389271 (1968-06-01), Gray
patent: 3600582 (1971-08-01), Davis
patent: 3894584 (1975-07-01), Fertl
Nucleonics, Feb. 1961, pp. 62, 63.

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