SCINTILLATORS
n P47 Scintillators They are coated with a thin layer of well selected P47 phosphor (Y1Si2O7:Ce3+; yttrium silicate activated with cerium), and have a high signal output and a good working life. They need not be coated with aluminum prior to use unless cathodoluminescence studies are required.
n YAG Single Crystal Scintillator Discs Advantages:
z Low Phosphor Noise. z High Resistance to Radiation Damage. z Long Working Life. z Possible Application in Ultrahigh Vacuum Conditions.
YAG (Yttrium Aluminum Garnet activated by Ce3+ ) has a very fast response
time of 50-60ns and they do withstand well to the bombardment by electrons or ions far better than plastic or phosphor scintillators. Light emission peaks at about 560nm which means that S20 photocathodes are most suitable for detecting the emission. YAG is suited for high current operations. The response is better then for the P47 discs below 5kV and again at higher accelerating voltages, where the performance of powder scintillators fall off while the response of the YAG continues to increase linearly. The crystal should be coated with 50nm of aluminum prior to use. If the layer becomes damaged it can be removed with sodium hydroxide. The crystals are mounted with the matt surface in contact with the light pipe as this has shown to increase the efficiency.
n YAP Single Crystal Scintillator Discs YAP (Yttrium Aluminum Perovskite activated by Ce3+
) shares the same
advantages as YAG but is more efficient in terms of light output than YAG crystals. As well, the emission spectrum peaks at about 378nm, and this corresponds closely to the maximum sensitivity of the S11 photocathode which in general is used in most scanning electron microscopes. (There would be more improvement in signal by using a YAP crystal rather than YAG in these microscopes). The decay time of YAP (40ns) is faster than YAG (80ns) so its overall performance is superior to YAG. YAP crystals should be coated with 50nm of aluminum prior to use.
n Light Pipe Scintillators
The light pipe is the connection between the scintillator and the phosphomultiplier tube (PMT). It transfers the photons produced by the scintillator for detection by the PMT. We coat the scintillator material directly on the light pipe which improves the signal. Light Pipes are available in optical quality quartz and optical grade acrylic. Cambridge reduced-tip models are only available in acrylic. High voltage wire and corona ring are included. JEOL pipes include a flange. Price includes one Re-coating Certificate. Re-coating is typically needed twice per year.
Dia. (mm) x
Thick (mm) Instrument 6.2 x 1
7.5 x 1 8.8 x 2
9.0 x 3
10.0 x 1 12.0 x 1
Phillip Quad Detector ISI Mini-SEM
Jeol JSM T20, T200, T300, 340 ETEC
Cambridge except S600, AMRAY 1200
Cambridge S600
12.0 x 0.17 Zeiss SEM 12.4 x 3.2. Cameca 13.7 x 1
19.0 x 1 ISI Mini-SEM, Jeol
16.4 x 0.17 Novascan, SEMCO/Zeiss 18.0 x 1
Camscan, Balscan, Cambridge S-4 Jeol U3, JSM2
19.0 x 7.3. ARL SEMQ 19.8 x 1
20.0 x 2 Hitachi w/metal ring.
20.0 x 1 AMRAY except 1200, Jeol 50A, 35,Hitachi Philips SEM
Cat.# Cat.# Cat.#
P-47 YAG YAP 82010 82040 82070
82012 82042 82072 82013 82043 82073
82014 82044 82074 82016 82046 82076
82017 82047 82077 82018 82048 82078 82020 82050 82080 82021 82051 82081 82022 82052 82082
82024 82054 82084 82026 82056 82086 82028 82058 82088 82029 82059 82089
82030 82060 82090 82032 82062 82092
Note: P-47 is usually in-stock. YAG and YAP delivery time is 6-8 weeks.
P47P Light Pipes Microscope
Cambridge Cambridge Cambridge Cambridge Cambridge Cambridge Cambridge Cambridge Cambridge
JEOL U-2, U-3 JEOL JSM-35
Substrate Quartz
Quartz Quartz Quartz Quartz
Style
Length
74mm 89mm
Cat. No.
Angled —— 82000-10 Straight Straight Straight
104mm
Acrylic Reduced Tip 88mm Acrylic Reduced Tip 100mm Acrylic Reduced Tip 120mm Acrylic Reduced Tip Quartz Quartz
Any
1⁄4" Collar 1⁄2" Collar
60mm 60mm
* Replace the asterisk by the length of the Light Pipe.
82000-74 82000-89 82000-104
Straight Up to 200mm 82000-x * 82001-88 82001-100 82001-120 82001-x* 82004-60 82005-60
Re-coating Service ———— Various ————- 82008-RS
Electron Microscopy Sciences In PA: (215) 412-8400 • Toll-Free (800) 523-5874 Fax (215) 412-8450 or 8452 • email:
sgkcck@aol.com or
stacie@ems-secure.com •
www.emsdiasum.com
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