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ucin1109117669.pdf (1.34 MB)
ETD Abstract Container
Abstract Header
TRANSPORT OF RADON IN STILL WATER
Author Info
SYAHRIR, SYAHRIR
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109117669
Abstract Details
Year and Degree
2005, PhD, University of Cincinnati, Engineering : Nuclear and Radiological Engineering.
Abstract
A new method was developed to measure the effectiveness of water in reducing the release of radon emanating from
226
Ra-bearing sand into air. Fick’s law on diffusion was used to model the transport of radon in water including the impact associated with radioactive decay. A multi-region, one-dimensional, steady-state transport model was used to analyze the movement of radon through a sequential column of air, water and air. An effective diffusion coefficient was determined by varying the thickness of the water column to predict the transport of
222
Rn through particular thickness of water. A one-region, one-dimensional transient diffusion equation was developed to investigate the build up of radon at the end of the water column until a steady-state, equilibrium condition was achieved. This build up with time is characteristic of the transport rate of radon in water and established the basis for estimating the effective diffusion coefficient for
222
Rn in water. The results suggest that convective forces other than molecular diffusion impact the transport of
222
Rn through the water barrier. An effective diffusion coefficient is defined that includes effects of molecular diffusion and convection to describe the transport of radon in water. Several experimental arrangements were evaluated to examine the influence of physical parameters on the radon transport. The effective diffusion coefficients measured in these experiments are 6.8×10
-4
± 28% and 3.5×10
-4
± 34% cm
2
sec
-1
for the steady-state and transient diffusion approaches, respectively. Water barriers ranging in thickness from 30 – 50 cm reduce the amount of radon released from the radium-bearing source material by a factor of 0.3 – 0.1, respectively.
Committee
Dr. Henry Spitz (Advisor)
Pages
101 p.
Keywords
radon
;
222
Rn
;
water
;
diffusion
;
diffusion coefficient
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Citations
SYAHRIR, S. (2005).
TRANSPORT OF RADON IN STILL WATER
[Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109117669
APA Style (7th edition)
SYAHRIR, SYAHRIR.
TRANSPORT OF RADON IN STILL WATER.
2005. University of Cincinnati, Doctoral dissertation.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109117669.
MLA Style (8th edition)
SYAHRIR, SYAHRIR. "TRANSPORT OF RADON IN STILL WATER." Doctoral dissertation, University of Cincinnati, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109117669
Chicago Manual of Style (17th edition)
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Document number:
ucin1109117669
Download Count:
1,215
Copyright Info
© 2005, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.