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Radiation Protection Dosimetry Advance Access published online on September 24, 2007
Radiation Protection Dosimetry, doi:10.1093/rpd/ncm420
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

SUPPRESSION METHODS OF RADON EMANATION FROM PHOSPHORUS FERTILISER AND DIATOMACEOUS EARTH

T. Sasaki1,*, Y. Gunji2 and T. Okuda2

1 EBS Technology Research Project, Radioactive Waste Management Funding and Research Center, No. 15 Mori Bldg, 2-8-10, Toranomon, Minato-ku, Tokyo 105-0001, Japan
2 Environmental and Safety Management Department, Nuclear Fuel Industries Ltd, Tokai Works; 3135-41, Muramatsu, Tokai-mura, Naka-gun, Ibaraki 319-1196, Japan

* Corresponding author: tosasaki{at}rwmc.or.jp

Received May 16, 2006, amended August 24, 2006, accepted August 27, 2006

The present paper shows methods to suppress radon emanation from artificial porous materials such as phosphorous fertiliser or diatomaceous earth with a small amount of radium. The basic concept of suppression is making the radon emanation mechanism ‘null’, which comes from the fact that recoil is the main mechanism of radon emanation at room temperature. Nullifying may be done through removal of water in the pore volume by heating and through removal of pores by melting or filling with sulphur. These radon emanation suppression methods were tried for phosphorous fertiliser and diatomaceous earth with a small amount of radium. The melting method was the most effective of all. Sustainability of these methods was also studied. The melting method was the most sustainable. The heating method was also sustainable for diatomaceous earth in spite of a long-term immersion in water.


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