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.