Re: Frequency of SRD Calibration

["Sandy Perle" <sandyfl@ix.netcom.com>]

The practices I am familiar with are:

1. The TLD or Film is currently accepted as primary doisimetry (NVLAP 
and DOELAP accredited)

2. If the primary dosimeter is lost, a secondary device, such as a 
SRD, EPD or any other accepted dose reconstruction methodology can be 
used, and, the dose on the NRC Form 5 is still listed as the "dose of 
record"

3. The SRD, EPD should be calibrated semi-annually.

4. Primary dose of record need not be NVLAP or DOELAP accredited, 
i.e., EPD, UNLESS the regulatory agencies require that they be so 
accredited (which they have been very reluctant to follow through 
with, as of yet)

The reality is, the SRD or PIC as some would like to call it, isn't 
very stable, accurate or precise, and it doesn't really matter 
whether it is validated on a 3 month, 6 month or any other frequency. 
However, if the primary dosimeter is lost, then the licensee must use 
some method to arrive at "some" estimate of the dose, and hen record 
it. Just get the individual to acknowledge it, and it then becomes 
the dose of record.

Sandy Perle
Director, Technical Operations
ICN Dosimetry Division
Office: (800) 548-5100 Ext. 2306 
Fax: (714) 668-3149

E-Mail: sandyfl@ix.netcom.com    

Homepages:

http://www.netcom.com/~sandyfl/home.html
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