312 Digital Spectral Gamma Ray Tool

Digital Spectral Gamma Ray Tool (DSGRT) provides information about mineral composition of formations. DGSRT detects the total energy of gamma rays radiated in the disintegration of the radionuclide in the formation. DGSRT detects quantities of radioactive elements U, Th and K. Also, DSGRT can detect short lived radioactive isotopes in formation like Ir, Sb, Sc, and all others used in the range up to 4MeV. Communication is done by digital Manchester protocol. This tool provides efficient pile-up rejection system and has high spectral resolution of 256/512 channels.

TOOL USABILITY:

• Natural Gamma spectrometry
• Isotope tracer

TECHNICAL DESCRIPTION:

General:

• Tool Diameter: 43mm
• Tool length: 160 cm
• Measuring point: 40 cm from the tool bottom
• Weight: 11kg.
• Max. pressure: 20MPa
• Temperature range: Without flask - 125 °C ; With flask - 190 °C, ½ h, 175 °C, 2 h
• Communication: Digital, Manchester 20KHz, up to 2.7 data frames per second
• Power: 100V DC/70mA
• Cable: Designed for single conductor cable
• Borehole type : Open/cased hole

Other specification:

• Spectrometry: 256/512 energy channels.
• Surface equipment:  Novilog Surface Panel
• Data Frame: 267 words
• Channels: 256 channels for spectrum , time channel, pulse pile  up indicator,
• cable head voltage, flask temperature, 2 counters channels, 1 A/D channel.
• Pulse pile-up capabilities: detectable
• Working modes:
  • Mode 0 - sleep mode: auxiliary sensors works, gamma ray sensors switched off, high voltage on min;
  • Mode 1 - 256 energy channels spectrum presentation
  • Mode 2 - 512 energy channels spectrum presentation
• Spectrum adjustment:
  • Gain command,
  • LLD - low level height discrimination
  • ULD- upper level of pulse height discrimination.

Optional:

Large-volume scintillation detector for high sensitivity