We use several of the ludlums you'll find here:
http://www.ludlums.com/index.php?opt...Aads&Itemid=80
...among others, if it matters to your argument, although it probably wouldn't help you much because ludlum has been providing japan's first responders with instuments, so I am actually quite familiar with the exact instruments they are using, as it is my job to calibrate them daily. Funny enough that i wouldn't have even known that Ludlum meters are the EXACT meters being used in Japan had you not called my equipment experience limited and asked what we use. I think the differences among our experiences, opinions, and termonology may make this conversation entirely pointless. Not to mention that as a nuclear operator by profession, your entire livelihood is dependant on the continued use of nuclear power... the biggest fear of which involves safety and the fear of the unknown. You have a vested interest in the stance you're taking, which implies bias.
*Sorry for the multiple edits but it's tough to work and post at the same time.