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RE: Rad Source Blood Irradiator
Dear Laura,
Are you talking about a Rad Source blood irradiator?
I can depend on the unit model (esp., the tube model). For instance, is it an RS3000 (with 2000 series tubes) or another model with 1000-series tubes?
Perhaps one of the the tubes (i.e., the cathode/target) needs to be re-aligned following its burn-in period. In such a case, a service rep from Rad Source may be able to adjust the tube inside the unit.
The X-ray tube manufacturer is Comet (they bought the businesss from Philips). The 1000-series tubes do seem to show a steady decrease in output over time.
A contact name is Nils Hase, tel. (513) 831-5000.
I am VERY interested in learning more about these irradiators.
I would appreciate being kept in any loop of discussion.
Laura, you can contact me directly for further discussion if you like.
Best regards,
Grant
(613) 592-3400 ext 2869
-----Original Message-----
From: Smith, Laura T. (Physics) [mailto:Laura.Smith7@stjohn.org]
Sent: Monday, September 29, 2003 12:59 PM
To: radsafe@list.vanderbilt.edu
Subject: Rad Safe Blood Irradiator
Hello,
I would like to request a RADSAFE brain trust on an
issue we have with our Rad Safe Blood Irradiator.
We purchased a New Rad Safe Blood Irradiator in 2001 - which was at the time a new technology that uses
an X-ray Tube versus the standard Cs-137 for irradiating Blood products. Below I have listed our service
schedule, but the summary is every 6-12 months we are forced to increase the time the of irradiation due
to our TLD dosimetry measurement falling below the required 2500cGy+_10% we require for our standard. The time has
had to be increased to such a length that it will soon perhaps interfere with our duties and blood irradiation flow rate.
The manufacturer says they are not sure what is causing this and are currently performing research to
determine why time always needs increasing. My initial thought was flaking of the anode, causing a filter effect
on the glass which continuous increases and filters out radiation, therefore taking longer to get to the 2500cGy
value. The manufacturer says they do not think so based on research, but are unsure - they do not manufacturer the
tubes and are in consult with the tube manufacturer.
Other than the flaking of the anode theory, what might cause this?
Laura Smith
Date Issue TLD Dose Time
8/8/2001 New unit 2534
8/10/2001 independent evaluator 2734 6.4min
9.27/01 Dose check 2350 ""
10/19/01 Qtrly Dose Check 2660 ""
1/24/02 "" 2610 ""
5/24/02 "" 2460 ""
7/12/02 "" 2440 "" - time increased
10/10/02 time increased check again 2460 6.8
12/26/02 Annual service contract 2360 6.8
1/15/03 Qtrly Dose Check 2190 6.8 - time increased
2/4/03 time increased check again 2530 7.5
4/7/03 Qtrly Dose Check 2360 7.5 - time increased
7/9/03 time increase check again 2460 8.1
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