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Radiation Protection Dosimetry Advance Access originally published online on June 7, 2005
Radiation Protection Dosimetry 2005 117(4):395-401; doi:10.1093/rpd/nci306
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Inhalation dose due to presence of 131I in air above septic tank system of an endocrinology hospital

J. W. Mietelski*, S. Grabowska, T. Nowak, J. Bogacz, P. Gaca, M. Bartyzel and M. Budzanowski

The Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, E.Radzikowskiego 152 Street, PL-31-342 Kraków, Poland

* Corresponding author: Jerzy.Mietelski{at}ifj.edu.pl

Received August 10, 2004, amended May 3, 2005, accepted May 16, 2005

We present here measurements of the 131I concentration for both: gaseous and aerosol fraction of 131I in the air above the septic tank containing wastes from medical application of this isotope. Aerosols were collected using air filters, whereas gaseous forms of iodine were trapped in KI impregnated charcoal double layer cartridge. Besides an active method (pumping of the air through system of filters) an attempt for using a passive method (charcoal traps) for monitoring of radio-iodine is described. For better characterisation of a site the external kerma was determined by means of G–M and TLD techniques as well as the activity kept in the septic tank was measured by gamma spectrometry. Results show that the activity of the aerosol fraction can be neglected compared to that of the gaseous fraction. He measured activity of air is low, on the level of 1 Bq m–3, even during simulated failure of the ventilation system. Estimated inhalation dose for the serviceman of septic tanks is low (~10%) compared with external dose obtained by such person due to gamma radiation from the tank (on the level ~500 nSv h–1). Therefore, the concept of passive monitoring of the iodine in air was abandoned. Also estimated is the efficiency of 131I reduction by a charcoal filter of the ventilation system and 131I input to the environment by the ventilation chimney.


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