Re: Instrument Repair/calibration

["hayden_mercer" <hayden_mercer@email.msn.com>]

Joey,

The answer to your question is, in my opinion, "changing the cable might
significantly change the response of the instrument"  and  if so
recalibration would be indicated.  The quality of the crimp/solder between
the two connectors and the signal/HV cable can affect the response of the
instrument.  In our instrumentation program, we use check sources to perform
daily response checks on both dose rate and count rate instruments. Each
instrument has a specific check source that is used to verify the
instruments response.  We have programatically established acceptable
response criteria for each instrument type and check source combination.  If
we perform minor repairs on an instrument, the instrument is source checked
after the repair has been completed.  If the instrument passes the source
check, then it is placed in service.  If it fails the source check, it is
removed from service for recalibration or further repair if necessary.

The comments are mine and mine alone and not those of my employer.

Hayden Mercer
Health Physics Department
Florida Power and Light Company
St. Lucie Plant


From: Joey Michael <jmichael@blue.weeg.uiowa.edu>
To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
Date: Thursday, December 31, 1998 5:29 PM
Subject: Instrument Repair/calibration


>
>
>Does changing a the cable on a portable GM (such as a Ludlum model 3)
require the instrument to be recalibrated.  I know that the regs. state
annual calibration and calibration after repair, but an exception is given
for battery changes, but does changing the cable connecting the probe rank
as a repair for this purpose?  It doesn't seem to me that it would
significantly change the instruments response.
>
>Thanks and Happy Holidays
>
>Joey Michael
>mailto:joey-michael@uiowa.edu
>University of Iowa
>Health Protection Office
>
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