According to the ASCII art it's "GLADOS"
Check this page. Look at the second post, click Show and scroll down to GLADOS you'll see the same ASCII art there in reference to that name.
EDIT: In case that page goes away here it is
"GLADOS1" "[12.000] #+ @ # # M#@ "
"GLADOS2" "[12.000] . .X X.%##@;# # +@#######X. @#% "
"GLADOS3" "[12.000] ,==. ,######M+ -#####%M####M- #"
"GLADOS4" "[12.000] :H##M%:=##+ .M##M,;#####/+#######% ,M#"
"GLADOS5" "[12.000] .M########= =@#@.=#####M=M#######= X#"
"GLADOS6" "[12.000] :@@MMM##M. -##M.,#######M#######. = M"
"GLADOS7" "[12.000] @##..###:. .H####. @@ X,"
"GLADOS8" "[12.000] ############: ###,/####; /##= @#. M "
"GLADOS9" "[12.000] ,M## ;##,@#M;/M#M @# X#% X# "
"GLADOS10" "[12.000].%= ######M## ##.M#: ./#M ,M #M ,#$ "
"GLADOS11" "[12.000]##/ $## #+;#: #### ;#/ M M- @# :"
"GLADOS12" "[12.000]#+ #M@MM###M-;M #:$#-##$H# .#X @ + $#. #"
"GLADOS13" "[12.000] ######/.: #%=# M#:MM./#.-# @#: H#"
"GLADOS14" "[12.000]+,.= @###: /@ %#,@ ##@X #,-#@.##% .@#"
"GLADOS15" "[12.000]#####+;/##/ @## @#,+ /#M . X, "
"GLADOS16" "[12.000] ;###M#@ M###H .#M- ,##M ;@@; ###"
"GLADOS17" "[12.000] .M#M##H ;####X ,@#######M/ -M###$ -H"
"GLADOS18" "[12.000] .M###% X####H .@@MM@; ;@#M@ "
"GLADOS19" "[12.000] H#M /@####/ ,++. / ==-, "
"GLADOS20" "[12.000] ,=/:, .+X@MMH@#H #####$="
Best Answer
The disintegration sounds are in (for standard Windows configuration of Steam)
C:\Program Files (x86)\Steam\steamapps\common\Portal\portal\portal_pak_dir.vpk.This file has a bunch of folders with files used in Portal. I opened it in GCFScape and found that
dinosaur_fizzle.wav,dinosaur_fizzle2.wav, anddinosaur_fizzle3.wav. As seen in this video these files were added along with the other radio-related audio to the 2010 update and play when the radio is "emancipated".The three specific files are in this Google Drive folder I made.