[ RadSafe ] Re: attn. Landauer Customers

[Dale Boyce]

John's point is definitely a real one. While I have personally seen doses as 
high as 300 mrem from intransit, I have seen a report come back for a couple 
of thousand badges, several hundred of which had exposures reported between 
10 and 50 mrem with most in the 20 to 30 mrem category.

Since these films were all shipped in the same box, one wonders why the 
spread in reported exposure. Even though it is a lot of badges when shipped 
as the film only the box is pretty small.

Also, what correction could be applied in such a case if the control showed 
0, 10, 20, 30, 40, or 50 mrem?

I guess one solution is to not use carriers that also handle isotopes. The 
second best would be to not use the same carrier(s) that deliver isotopes to 
your facility, since the most probable place for the badges to be placed 
near a source in transit is during final delivery. However, in the case 
mentioned different carriers were used, but the one delivering the badges 
also does or at least did transport RAM.

Dale


----- Original Message ----- 
From: "Wright, Will (DHS-PSB)" <WWright2 at dhs.ca.gov>
To: "Flood, John" <FloodJR at nv.doe.gov>; <sandyfl at earthlink.net>; 
<jblute at NITON.com>; <radsafe at radlab.nl>; "Neill Stanford" 
<stanford at stanforddosimetry.com>
Sent: Wednesday, August 24, 2005 5:03 PM
Subject: RE: [ RadSafe ] Re: attn. Landauer Customers


i believe i deleted the initial strings, could someone briefly describe the 
issue or was this simply a discussion about the inconvenience of maintaining 
a control. controls are critical as indicated in all objective science 
endeavors/ bench top science as well as others will teach this the hard way.

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl]On
Behalf Of Flood, John
Sent: Wednesday, August 24, 2005 2:52 PM
To: 'sandyfl at earthlink.net'; jblute at NITON.com; radsafe at radlab.nl; Neill
Stanford
Subject: RE: [ RadSafe ] Re: attn. Landauer Customers


Perhaps I missed a post on this subject, but the discussion seems to be
overlooking the in-transit exposure that a control dosimeter also monitors.
There is no doubt that accurate background subtraction is important to low
dose measurements, but the absence of background measurements can be a
horrifying experience if every dosimeter in the shipment to the processor
shows a few hundred mrem from irradiation in-transit.  This is a very real,
modern problem - if your dosimeters sit next to some clinic's radionuclide
shipment on the truck or in the warehouse, expect to see 50-300 mrem on
every dosimeter (how would I know this?).  Without control dosimeters, life
certainly gets more complicated.

Bob Flood
Nevada Test Site


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