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

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Title: Radon (Rn-222) and thoron (Rn-220) emanation fractions from three separate formations of oil field pipe scale
Author: Fruchtnicht, Erich Harold
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 .
URI: http : / /hdl .handle .net /1969 .1 /1231
Date: 2004-11-15

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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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