Instruments & Resources

Instrumentation

YAXX uses state-of-the-art Olympus “Vanta” portable XRF (pXRF) instruments. The VMR model has a Rh anode in a 4-W X-ray tube, which is capable of voltages up to 50 kV.  When operated in the “GeoChem” or “GeoChem REE” mode, the X-ray tube’s current and voltage vary in combination with built-in beam filters to better fluoresce the heavier and lighter parts of the periodic table. The characteristic X-rays are measured using a large-area silicon drift detector and Olympus’ new Axon technology, that is, ultra-low-noise signal-processing electronics that allow high count rates (>100,000 counts/sec) with excellent spectrum resolution (<140 eV). High count rates correspond to better repeatability, lower uncertainties, and shorter measurement times. This model has a built-in GPS receiver to automatically geo-tag measurements in the field, and a built-in barometer corrects for altitude and air density, which is particularly important when measuring light elements near sea level in New Haven or at a Peruvian archaeological site.

Vanta VMR (M-Series) Specifications
Dimensions (W x H x D) 8.3 x 28.9 x 24.2 cm (3.25 x 11.4 x 9.5 in.)
Weight 1.70 kg with battery, 1.48 kg without battery
Excitation Source 4-Watt X-ray tube with Rh anode: 8-50 kV 
Primary Beam Filtration Built-in 8-position auto-selected filter wheel
Detector Large-area (40-mm2) silicon drift detector (SDD)
Power Removable 14.4 V Li-Ion battery or 18 V power transformer 100-240 VAC, 50-60 Hz, 70 W max
Display 800 x 480 LCD touch-screen with gesture control
Operating Environment Temperature: -10 °C to 50 °C 
Humidity: 10% to 90% relative humidity 
Drop Test Military Standard 810-G 4-foot (1.3 M) drop test
IP Rating IP64: dust tight and protected against water spray 
Pressure Correction Built-in barometer for automatic altitude correction
GPS Embedded GPS/GLONASS receiver
Operating System Quad-core processor running Linux
Data Storage 4 GB embedded storage plus micro SD slot 
USB Two USB 2.0 type A host ports 
One USB 2.0 type mini-B port 
Wireless LAN Supports 802.11 b/g/n (2.4 GHz) via USB adapter
Bluetooth Supports Bluetooth® via USB adapter
Aiming Camera Full VGA CMOS camera
Panorama Camera 5-megapixel CMOS camera with autofocus
Beam DIAMETER 8 mm or 3 mm with built-in beam collimator
sectral resolution < 140 eV at > 100,000 counts per second (cps)