Re: Analysis of Food Irradiation Using TLD

[Andrew McEwan <acmcewan@clear.net.nz>]

Franz



I no longer have the original enquiry to Radsafe on this matter.  However I

would note thermoluminescence has been used to assess doses to some

foodstuffs such as spices which are irradiated to high (2.5 Mrad, 25 kGy)

doses to kill bacteria for food safety purposes. Within the spices are very

small quantities of inorganic minerals which can, after careful extraction,

be heated and made to yield a thermoluminescence signal. I am not aware of

the technique being used on a routine basis anywhere but it has certainly

been investigated as an independent means of determining whether foodstuffs

like spices have been irradiated.



Regards



Andrew McEwan

----- Original Message ----- 

From: "Franz Schönhofer" <franz.schoenhofer@CHELLO.AT>

To: "'Rotunda, Joseph'" <joseph.rotunda@thermo.com>; "'RadSafe'"

<radsafe@list.vanderbilt.edu>

Cc: "'Liepert, Harold'" <harold.liepert@thermo.com>

Sent: Saturday, September 18, 2004 9:15 AM

Subject: AW: Analysis of Food Irradiation Using TLD





>

>

> Franz Schoenhofer

> PhD, MR iR

> Habicherg. 31/7

> A-1160 Vienna

> AUSTRIA

> phone -43-699-1168-1319

>

> -------------------------------------------------------------

>

>

> Joe,

>

> Your message is really difficult to understand.

>

> Do you know, that "TLD" is the abbreviation for "Thermoluminescence

> Dosimetry", a method to determine the dose to somebody or something from

> gamma-radiation, exposing certain material to radiation. You cannot

> detect food irradiation with that method, unless you expose a

> TLDosemeter together with the food in order to determine the dose -

> well, and then you know, that it was irradiated anyway.

>

> What are "associated methods"? Could you clarify?

>

> Thermoluminescence phenomena can be used to detect irradiation of food

> and other material. For various food other methods like

> gas-chromatography, viscosity or various biological methods might be

> applicable. There is plenty of literature on that.

>

> I recommend that you consult the relevant literature to find out, what

> you actually want - your request for "TLD and associated methods" gives

> me the impression that you do not know it. Starting the business of

> finding irradiated food from scratch needs a "little" more than asking

> at RADSAFE whether somebody has "experience with Analysis of Food

> Irradiation using TLD and associated methods", not to talk about

> becoming an accredited laboratory!

>

> Franz

>

> --------------------------------------------------------------------

>

> > -----Ursprüngliche Nachricht-----

> > Von: owner-radsafe@list.vanderbilt.edu [mailto:owner-

> > radsafe@list.vanderbilt.edu] Im Auftrag von Rotunda, Joseph

> > Gesendet: Donnerstag, 16. September 2004 19:40

> > An: RadSafe

> > Cc: Liepert, Harold; Rotunda, Joseph

> > Betreff: Analysis of Food Irradiation Using TLD

> >

> > Does anyone have experience with Analysis of Food Irradiation Using

> TLD

> > and associated methods?  If so, would you please respond to my email

> > address.  Thank you.

> >

> > Best Regards,

> > Joe Rotunda

> >

> >

> ************************************************************************

> > You are currently subscribed to the Radsafe mailing list. To

> > unsubscribe, send an e-mail to Majordomo@list.vanderbilt.edu  Put the

> > text "unsubscribe radsafe" (no quote marks) in the body of the e-mail,

> > with no subject line. You can view the Radsafe archives at

> > http://www.vanderbilt.edu/radsafe/

>

>

>

> ************************************************************************

> You are currently subscribed to the Radsafe mailing list. To

> unsubscribe, send an e-mail to Majordomo@list.vanderbilt.edu  Put the

> text "unsubscribe radsafe" (no quote marks) in the body of the e-mail,

> with no subject line. You can view the Radsafe archives at

> http://www.vanderbilt.edu/radsafe/

>

>





************************************************************************

You are currently subscribed to the Radsafe mailing list. To

unsubscribe, send an e-mail to Majordomo@list.vanderbilt.edu  Put the

text "unsubscribe radsafe" (no quote marks) in the body of the e-mail,

with no subject line. You can view the Radsafe archives at

http://www.vanderbilt.edu/radsafe/