GR-320 enviSpec Portable Gamma Ray Spectrometer
Overview
The GR-320 enviSpec is a portable gamma ray spectrometer that is accurate and easy to operate. This instrument provides real-time results for mineral exploration.
Applications
The GR-320 enviSpec is intended for use as a mineral exploration tool suited for:
Exploration geologists and geophysicists
Mineral exploration companies
Superficial and bedrock mapping geologists
Individual prospectors

Features
The GR-320enviSpec measures potassium, equivalent thorium concentrations in-situ, virtually in real time. See photo
Key features include:
256/512 channel operation: software selectable.
One or two detector input: size range of 21 to 512 cu. ins.
Automatic spectrum stabilization: internal or natural isotope.
8 regions-of-interest set from the keyboard.
High linearity ADC with zero dead time.
Choice of coincidence or anti-coincidence operation.
Exposure rate mode + isotope analysis for environmental data.
Assay mode for geophysical data - %K, ppm eU, eTh.
Large internal data memory with input capability for GPS position.
RS-232 serial digital output facilitates spectrum, ROI and GPS data.
Rechargeable (standard) or alkaline battery operation.
Full remote control capability.
User application programs supplied.
Background, K, U and Th calibration using traceable test pads.
Benefits
Using the GR-320enviSpec can minimize the high costs associated with rock or soil sample collection, shipping, lab preparation and chemical analysis for elements collected. The use of gamma ray spectrometry increases the likelihood of finding deposits of gold, silver, copper, lead, zinc, rare earth elements and many other commodities.

Specifications:

Console Weight: 9 lbs (4.08 kg)


256/512 Channel Operation: For most geophysical applications, the 256 channel operation is fully adequate. However, the extra precision provided by the 512 channel capability, especially in the lower regions of the spectrum, offers significant improvements in data resolution for the environmental sector. This 256/512 channel option is software selectable from the GR-320 keyboard.

Two Detector Capabilities: In most portable applications, a single 21 cubic inch sodium-iodide detector is adequate. However, in surface vehicle, helicopter and aircraft applications, larger crystals are required. The GR-320 can support detector packs of up to 512 cu. in.

Automatic Spectrum Stabilisation: The operator may select to stabilize the system using an internal Cesium source, or choose a naturally occurring isotope at the site of operation. In the local isotope mode, the system automatically accumulates until the isotope data is useable for gain control.

Calibration: Exploranium, a Division of SAIC, provides calibration for each spectrometer on test pads traceable to GSC standards to assure the accuracy of each instrument.

Assay Mode: Using internal calibration constants, the GR-320 measures concentrations in %K, or ppm of U and Th.
Regions-of-Interest: Up to 8 ROIs may be set from the system keyboard.

Exposure Rate: For environmental applications, the GR-320 does automatic natural isotope spectrum stripping, and then carries out a full peak analysis to identify any isotopes in the stripped spectrum. The individual isotope exposure rate is then computed by using internal calibration data.

High Linearity ADC: The GR-320 uses a unique technique to achieve fast, reduced to virtually zero dead time analog-to-digital conversion with excellent differential linearity. This capability is important in large detector/high count rate applications.
Sample Time: From: 1 to 9999 seconds.

Coincidence: Either coincidence or anti-coincidence operation is possible when two detectors are used with the GR-320.
GPS Data: The GR-320 has the capability to accept the location data from a portable GPS receiver. This position data is then stored in memory with the spectrometer data.

Real Time Clock: A real time clock is built into the system.

Data Storage: The GR-320 enables the operator to select combinations of ROI, spectra and GPS data to be stored in an internal memory (capacity 384 kbytes) or output via an RS-232 port. 690 full spectra or 3574 sets of ROI data can be stored.

Display: An LCD graphics display is used to display computed data as well as full spectra data.
Digital Output: Bidirectional serial (RS-232) output port with operation up to 19200 Baud is provided. Data is fully buffered so that 1/sec data transfer of full spectrum data does not interfere with data acquisition.

Power: The GR-320 is powered by a rechargeable battery pack with built-in charger, or by 9-15V DC external power. The following power options are also available: a battery pack for operation with 6 "D" type alkaline batteries, and a power attachment permitting operation from 14-40V DC.

 

This wide range of abilities allow the GR-256 to be used by a variety of users including: Uranium Exploration, Laboratory Analysis, Vehicle Mobile as well as Environmental Analysis applications.