An old probe service guy here. Julian and Stewart are correct. Johan crystals (TAPJ) vs Johansson crystals (TAP) See the article from Microscopy and Microanalysis http://www.geoscience.wisc.edu/~johnf/g777/MM/Wittry.pdf Sent by Mr. "T" > On Sep 23, 2020, at 1:54 AM, Stuart Kearns <[log in to unmask]> wrote: > > > Hi Radoslaw, > So, I have a document that I’m fairly certain was supplied by JEOL that says: > Johansson crystals: TAPH, PETHS, LIFHS, PETL > Johan crystals: TAPJ, PETJ, LIF, LIFL, LIFH, PETH + Multilayers and STE > > That doesn’t answer your question – I had always assumed like Ron, that the ‘J’ simply stood for JEOL. But, they are in any case ‘normal’ crytals – We had TAPJs on our old 8600. > > Best wishes, > Stuart > ____________________________ > Stuart Kearns > School of Earth Sciences > University of Bristol, UK > Tel. +44 (0)117 331 5004/5012 > [log in to unmask] > > > From: JEOL-Focused Probe Users List <[log in to unmask]> on behalf of Allaz Julien <[log in to unmask]> > Reply to: JEOL-Focused Probe Users List <[log in to unmask]> > Date: Wednesday, 23 September 2020 at 09:43 > To: "[log in to unmask]" <[log in to unmask]> > Subject: Re: [PROBEUSERS] TAPJ, TAPH, TAPL or TAP? > > Hi Radoslaw, > > Unless I am mistaking, historically the “J” indicate that the monochromator geometry is of “Johansson” type (in opposite to Johann). The Johansson geometry has the 2d lattice bent at a radius of 2R, and the monochromator is then further grinded to a R radius, offering thus a perfect focusing of the X-ray on the detector. > > Nowadays it is common to still see it on the PET monochromator (PETJ) but I haven’t seen it on other monochromator… > > Best, > > Julien > > > ########################### > Dr. Julien Allaz > Head assistant for SEM/EPMA > Inst. für Geochemie und Petrologie > ETH Zürich > NW E 84 > Clausiusstrasse 25 > 8092 Zürich > Switzerland > > Tel: +41 44 632 37 20 > Fax: +41 44 632 16 36 > Email: [log in to unmask] > ########################### > > > On 23 Sep 2020, at 10:10, Michallik Radoslaw (GTK) <[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] > > www.gtk.fi I @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], 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 > * > > **** 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 > > * > > **** 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 > > * **** 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 *