Mini 900 Scintillation Monitors

Mini 900 Scintillation Monitors

Thermo Scientific™ Mini 900 Scintillation Monitor serves as a portable or benchtop style radiation counter. A variety of different probes to accommodate most radiation detection needs.

Feature a large logarithmically scaled meter with an open scale at the lower end to show background levels of radiation while displaying high levels without switching

  • Several configurations available
  • Built-in speaker provides audible feedback of the radiation intensity
  • An alarm can be set to tripat any level on the scale
  • Battery or line powered
  • Packaged in a durable, lightweight aluminum case&bulletc1_end


Type R:

  • Monitoring High Level Dose Rates A monitor scaled over the range 0.5 to 5000μSv h-1 (0.05 to 500mR/h)
  • G-M tube is compensated to give a useful response from 45 keV to 1.5MeV and above
  • Not recommended for monitoring X-radiation from apparatus operating below 75kVp

Type G:

  • Monitoring for Low Environmental Dose Rates Highly sensitive performance
  • Scaled over the range 0.05 to 75μSv h-1 (0.005 to 7.5mR/h)
  • Useful energy range: 55 keV to 1.5MeV and above
  • Not suitable for monitoring X-radiation

Type D:

  • Uses partially compensated G-M tube to obtain an extended low energy response
  • Scaled over the range of 0.5 to 1000μSvh-1 (0.05 to 100 mR/h)
  • Useful energy range: 30 keV to 1.5MeV but response is maintained down to at least 17 keV
  • Suitable for measuring radiation from X-ray apparatus operating at or above 45kVp

Type X:

  • Scaled 0.5 to 2000 counts per second Uses an end window G-M tube without energy compensation
  • Sensitive to radiation down to 10keV Useful for locating X-ray leakage from a variety of systems including high voltage equipment
  • Not intended for measurement but as a relative check device

Type 41:

  • Sodium iodide crystal (19mm dia. × 25mm thick)
  • Suitable for energies from 25 keV upwards
  • A lead cylinder surrounds the crystal gives the probe directional properties as well as reducing background
  • Diameter: 41mm
  • Length: 220mm

Type 41S:

  • Cylinder without lead shielding and with a larger sodium iodide crystal (25mm dia. × 38mm thick) for increased sensitivity
  • Suitable for energies from 25 keV upwards The probe is essentially omni-directional for medium and high energy gamma radiation
  • Diameter: 38mm
  • Length: 217mm

Type 42A:

  • Sodium iodide crystal 23mm dia. × 1mm thick with a 14mg cm2 aluminum window
  • Probe has a higher sensitivity than the Type 41 for gamma energies below 60 keV to a minimum of 10-15 keV
  • An integral lead collimator makes it particularly useful for 125I thyroid monitoring and deep vein thrombosis location
  • Diameter: 40mm
  • Length: 187mm

Type 42B:

  • This probe is the beryllium window version of the type 42 and detects very low gamma energies down to 5keV
  • The response above 15 keV is almost identical to the 42A

Type 44A:

  • The sodium iodide crystal (32 × 2.5mm thick) is mounted on the front surface of the probe to facilitate monitoring of large contaminated areas Suitable for a range of energies from approximately 15 keV to 250 keV Beta sensitive for energies above 500 keV
  • Diameter: 50mm
  • Length: 180mm
  • Aluminum window weight: 14mg/cm2

Type 44B:

  • This probe is the beryllium window version of the above and extends the sensitivity down to approximately 5keV, making it useful for 55Fe
  • 3.7kBq (0.1μCi) of 55Fe at 10mm yields approximately 180 counts s-1
  • Window weight: 47mg/cm2