Exploranium GR-135 Plus Radioisotope Identifier


 

Overview:

An SAIC Exploranium model GR-135ND-H portable radioisotope identifier (RIID) incorporating a Sodium Iodide NaI(Tl) based gamma ray spectrometer, a high range Geiger tube and a He3 neutron detector.

 

Exploranium GR-135 Plus (12/15/2018)

Complete unit found on eBay with some minor problems

 

Exploranium GR-135 Plus (12/15/2018)

The case detaches via 4 screws on the bottom

 

Exploranium GR-135 Plus (12/15/2018)

The electronics and detector assemblies are attached to the top part of the case

 

Exploranium GR-135 Plus (12/15/2018)

2 D cell batteries are installed in the back

 

Exploranium GR-135 Plus (12/15/2018)

Neutron detector board (with high range Geiger tube) is mounted on the bottom

 

Exploranium GR-135 Plus (12/15/2018)

He3 tube next to audio connector

 

Exploranium GR-135 Plus (12/15/2018)

Analog processing board to tun pulse height analysis on the NaI detector

 

Exploranium GR-135 Plus (12/15/2018)

CPU board

 

Exploranium GR-135 Plus (12/15/2018)

Original LCD screen had some bad lines. This is a common problem with the gr135.

 

Exploranium GR-135 Plus (12/15/2018)

Battery holder removed

 

Exploranium GR-135 Plus (12/15/2018)

Analog board unscrewed

 

Exploranium GR-135 Plus (12/15/2018)

Unsolder the NaI tube wire from the board

 

Exploranium GR-135 Plus (12/15/2018)

Analog board removed

 

Exploranium GR-135 Plus (12/15/2018)

Back of analog board

 

Exploranium GR-135 Plus (12/15/2018)

NaI detector in vibration/shock damping foam

 

Exploranium GR-135 Plus (12/15/2018)

Bottom of case has some corrosion

 

Exploranium GR-135 Plus (12/15/2018)

4 screws removed to detach top cover

 

Exploranium GR-135 Plus (12/15/2018)

4 more screws to remove LCD. The LCD was replaced with a spare one with fewer bad lines.

 

Exploranium GR-135 Plus (12/15/2018)

He3 detector, moderator, and Geiger tube

 

Exploranium GR-135 Plus (12/15/2018)

He3 tube charge sensitive amplifier in shielded metal box

 

Exploranium GR-135 Plus (12/15/2018)

He3 tube and charge sensitive amplifier (from spare parts, not from this unit)

 

Exploranium GR-135 Plus (12/15/2018)

Charge sensitive amplifier (from spare parts, not from this unit)

 

Exploranium GR-135 Plus (12/15/2018)

Charge sensitive amplifier (from spare parts, not from this unit)

 

Exploranium GR-135 Plus (12/15/2018)

Testing NaI spectrometer

 

Exploranium GR-135 Plus (12/15/2018)

Peaks from a Co60 and Cs137 source simultaneously being detected

 

Exploranium GR-135 Plus (12/15/2018)

Successful isotope identification

 

Exploranium GR-135 Plus (12/15/2018)

Testing neutron sensitivity with an IEC fusion neutron source

 

Exploranium GR-135 Plus (12/15/2018)

Colliding deuterium beams

 

Exploranium GR-135 Plus (12/15/2018)

Detecting neutrons and x-rays.

 

Exploranium GR-135 Plus (12/15/2018)

ID of neutrons, unfortunately it doesn't give neutron dose rates, so it will be a little hard to directly calculate neutron flux with this detector.

 

Exploranium GR-135 Plus (12/15/2018)

Neutrons detected in search mode

 

Exploranium GR-135 Plus (12/15/2018)

X-ray dose kept to 163uR/h due to good shielding and lead glass viewports.

 
   
 
   
 

 

 


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