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Year : 2010  |  Volume : 33  |  Issue : 3  |  Page : 143-146

Dose rate reduction using epoxy mixed lead shielding: Experimental and theoretical determination of shielding effectiveness

1 Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai, India
2 Research Reactor Maintenance Division, Bhabha Atomic Research Centre, Mumbai, India

Correspondence Address:
R.K.B. Yadav
Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai
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Source of Support: None, Conflict of Interest: None

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High background radiation field exists in water treatment area (WTA) of rod cutting building (RCB) in Cirus due to beta, gamma contamination on it's floor. The high contamination on sides of wall and on floor is primarily due to deposition of activity generated during the regeneration of old mixed bed cartridges earlier (before year 1985) and presently due to deposition of contaminants by sump overflowing and wastes generated during maintenance/servicing of circulating pumps. RCB-WTA contribution to collective dose in present situation is up to 30% of the total collective dose of Cirus. Committee formed for developing methods and implementing measures to reduce high radiation background in RCB-WTA suggested tiling of the contaminated floor with prefabricated epoxy mixed lead shots, from ALARA point of view, after considering various options. These slabs of different thickness were tested for shielding effectiveness experimentally by using radiation source and theoretically using a code. Dose reduction factor of ~3.5 for a point source, obtained experimentally for epoxy mixed lead shots was very near to value obtained by theoretical simulation. An extended calculation for an area source using a code gives a higher dose rate reduction factor of ~28.

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