Radon (Rn-222) and thoron (Rn-220) emanation fractions from three separate formations of oil field pipe scale

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dc.contributor.advisor Hamilton , Ian Scott en_US
dc.contributor.committeeMember McFarland , Andrew R . en_US
dc.creator Fruchtnicht , Erich Harold en_US
dc.date.accessioned 2004 -11 -15T19 :51 :03Z
dc.date.accessioned 2014 -02 -19T18 :34 :26Z
dc.date.available 2004 -11 -15T19 :51 :03Z
dc.date.available 2014 -02 -19T18 :34 :26Z
dc.date.created 2004 -08 en_US
dc.date.issued 2004 -11 -15T19 :51 :03Z
dc.identifier.uri http : / /hdl .handle .net /1969 .1 /1231
dc.description.abstract Over the course of normal oil well operations , pipes used downhole in the oil and petroleum industry tend to accumulate a mineral deposit on their interior , which restricts the flow of oil . This deposit , termed scale , will eventually occlude the interior diameter of the pipe making removal from service and descaling a cost effective option . The pipes are sent to cleaning yards where they remain until descaling can be performed . This storage period can potentially create a health concern not only because of the external radiation exposure but also because of the radon gas emissions , both of which are due to the radioactive minerals contained in the scale . It was believed that the structure of the scale is formed tightly enough to prevent much of the radon from becoming airborne . The goal of this research was to determine the emanation fractions for the rattled scale samples from three formations . A high purity germanium detector was used to measure the activities of the parents and progeny of radon , and electret ion chambers were used to measure the concentration of radon emanated from the scale . The emanation fractions of between 4 .9x10 -5 and 1 .08x10 -3 for radon were a factor of approximately 100 smaller than previous research results . For thoron , the fractions were and 5 .72x10 -8 and 4 .92x10 -7 for thoron with no previous research to compare . However , information that pertains to the temperature dependence of emanation was included in this research and was not available for previous , similar research . Therefore , differences in the environment (e .g . , temperature , humidity , etc . ) in which the previous experiments were conducted , as well as differences in the scale formation types used , could account for the discrepancy . In addition , measuring the emanation fractions of the rattled scale was a method of determining whether surface to volume ratio dependence existed . After acquiring the emanation fractions , insufficient evidence of any surface to volume ratio dependence could be found . en_US
dc.format.extent 2445340 bytes
dc.format.medium electronic en_US
dc.format.mimetype application /pdf
dc.language.iso en _US en_US
dc.publisher Texas A &M University en_US
dc.subject radiation en_US
dc.title Radon (Rn -222 ) and thoron (Rn -220 ) emanation fractions from three separate formations of oil field pipe scale en_US
dc.type Book en
dc.type.genre Electronic Thesis en_US
dc.type.material text en_US
dc.format.digitalOrigin born digital en_US


Radon (Rn-222) and thoron (Rn-220) emanation fractions from three separate formations of oil field pipe scale. Available electronically from http : / /hdl .handle .net /1969 .1 /1231 .

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