RO-2/Telepole Reading Discrepancy

["Onesti, Carl" <Carl.Onesti@nmcco.com>]

We have identified a situation where a survey of the access gate to a demin resin bed with an RO-2 survey meter and a Telepole survey meter are not giving us consistent results.  Readings with several pairs of the instruments has consistently shown an approximate 40% difference in the readings with the Telepole 40% less than the RO-2.  I have my ideas on why this is occurring, however, I am making this query to see if other users have seen this condition and what they think the explanation is.



The resin bed source is predominantly Co-58 and there is no line-of-sight from the resin bed to the access gate.  The resin bed is located in a concrete cubicle.  The entrance to the cubicle is straight and not a labyrinth.  The dose rate measured by the RO-2 is in the range of 300 to 320 mR/hr.  The RO-2 is made by Eberline and the Telepole by MGP.



Thanks,



Carl Onesti

Point Beach Nuclear Plant

carl.onesti@nmcco.com

Phone: 920-755-6170

Fax: 920-755-6260

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