Hi, I believe, TAPJ are the normal sized crystals on the normal 140mm RC spectrometer, that are made for JEOL, so TAP-JEOL or TAPJ or just TAP. Happy to be corrected. Best Regards, Ron On 23 Sep 2020, at 6:10 PM, Michallik Radoslaw (GTK) <[log in to unmask]<mailto:[log in to unmask]>> wrote: Hi, I’ve been working on an old JEOL JXA 8600 with the normal “small size” x-tals i.e. TAP. I know that large crystals are i.e. TAPL (normal spectrometer 140mm) and high intensity crystals are TAPH for the H-Type spectrometer with a smaller Rowland circle (100mm). But what are i.e. TAPJ x-tals? What does the “J” stands for? I’ve noticed that they are usually mounted with a gas-flow proportional counter. I just started recently at my new work place and we’ll have a configuration with TAPJ and PETJ crystals on our new FE-EPMA from JEOL. Thank you in advance for your help. Kind regards, Radoslaw Michallik Researcher Circular Economy Solutions Geological Survey of Finland GTK Vuorimiehentie 2K, FI-02151 Espoo, Finland Tel. +358 29 503 0345, +358 50 340 9701 [log in to unmask]<mailto:[log in to unmask]> www.gtk.fi<http://www.gtk.fi/> I @GTK.fi<https://twitter.com/GTK_FI> The Geological Survey of Finland provides solutions for more sustainable growth. For Earth and for Us. <image001.png> **** JEOL Probe Users Listserver Moderator: Anette von der Handt, [log in to unmask]<mailto:[log in to unmask]>, Electron Microprobe Lab, University of Minnesota Post a message: send your message to [log in to unmask]<mailto:[log in to unmask]> Unsubscribe: send "SIGNOFF PROBEUSERS" to [log in to unmask]<mailto:[log in to unmask]> On-line help and FAQ: http://probelab.geo.umn.edu/jeoluserlist.html * **** JEOL Probe Users Listserver Moderator: Anette von der Handt, [log in to unmask], Electron Microprobe Lab, University of Minnesota Post a message: send your message to [log in to unmask] Unsubscribe: send "SIGNOFF PROBEUSERS" to [log in to unmask] On-line help and FAQ: http://probelab.geo.umn.edu/jeoluserlist.html *