Where can I find a material safety data sheet (MSDS) for 99mTc-DTPA
(technetium-labeled diethylenetriamine pentaacetate)

Hi dgc. Thanks for using Google Answers. 

What an interesting bit of research this has been. I've traced the
usage of DTPA through its regulation by the Nuclear Regulatory
Commission, the Atomic Energy Commission, and the FDA. The FDA has
licensed DraxImaging of Canada (
://www.google.com/url?sa=U&start=1&q=http://www.draximage.com/ )
as the manufacturer. Their MSDS is available in Adobe PDF format here:

http://www.draximage.com/acrobat/dtpamsds.pdf

I also turned up another manufacturer of DTPA, in Australia: Radpharm.
Their product information sheet, not as detailed as the DraxImage
MSDS, is here:

http://www.radpharm.com.au/Products/rp/DTPA-info.html

You might find these additional Radiation Safety Education links from
DraxImage useful:

[ http://www.draximage.com/education-radiation.html ]

I hope this answers your question and provides the information you're
seeking.

~larre-ga

Just listing some other useful resources for future reference.

***

MSDS Databases
http://www.msdssearch.com/DBLinksN.htm

It allows searching and links to various MSDS dabases, including those
housed at Cornell, Oxford, and government agencies.

***

Where to Find Material Safety Datasheets on the Internet
http://www.ilpi.com/msds/index.html

Great resource for assisting in finding MSDSs.

I've use http:/www.msdsonline.com  on numerous occasions