Portable 25x25 NaI(Tl) FWHM 10% Gamma Spectrometer for iPad or computer Spectroscopy Gamma-Viewer ver.1

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Quick Overview

Gamma-Viewer ver.1.00 is a Portable 25x25mm 10% NaI(Tl) Gamma Spectrometer for iPad or computer Spectroscopy. It has all required electronics with NaI(Tl) crystal and photo-multiplier tube for amateur gamma ray spectrometry on iPad/ iPhone or computer, fully plug-and-play device.

Technical specifications:

  • Directly compatible and plugable to PC audio cart or iPad / iPhone

  • 25x25mm NEW NaI(Tl) crystal

  • Internally installed photomultiplier tube with Mu-Metal shield

  • Internally installed and adjusted high voltage and pulse amplifier

  • Internally installed 300mAh rechargable battery with charging plug

  • Typical FWHM 10% at 662keV

  • Aluminum enclosure: length ~280mm, diameter ~56mm

  • Including SMA to 3.5mm audio cable

  • Including SMA to USB charging cable

  • Including TRRS iPad adapter

  • Including vibration protection rings

  • SKU: RH-Spec-25-2

DIY Portable 25x25 NaI(Tl) Gamma Spectrometer for iPad

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  • DIY Portable 25x25 NaI(Tl) Gamma Spectrometer for iPad
  • DIY Portable 25x25 NaI(Tl) Gamma Spectrometer for iPad
  • DIY Portable 25x25 NaI(Tl) Gamma Spectrometer for iPad
  • DIY Portable 25x25 NaI(Tl) Gamma Spectrometer for iPad
  • DIY Portable 25x25 NaI(Tl) Gamma Spectrometer for iPad
  • DIY Portable 25x25 NaI(Tl) Gamma Spectrometer for iPad
  • Cs-137 Gamma Spectrum
  • Quantum Pendant Gamma Spectrum
  • Eu-152 Gamma Spectrum


INTERNAL ASSEMBLY: Includes NOS PMT tube optically coupled with NEW 25x25mm NaI(Tl) scintillation crystal. Same crystals are normally sells for hundreds of dollars when purchased new. The PMT is wired with internally installed high voltage power supply. HV is stabilized, filtered and adjusted for the tube. Signal from PMT anode followed with pulse amplifier. Pulse level and duration at the output are compatible with Line/MIC input of sound card or iPhone. The electronics powered with internally installed rechargeable battery. The unit can be charged with 5V DC adapter. Battery capacity is enough for portable operation during 4-6 hours.

With the device you can test and identify gamma emitting isotopes, perform food test for radionuclides, test minerals, search radiation and etc. The spectrometer with freeware MCA software can successful detect Cs-137, Eu-152, Ba-133, Co-60, Am-241 and more dangerous nuclides. The unit has measured ~10% FWHM resolution at 662keV. Recommended to operate with 24bit audio cart on computer. Due to hardware and software limitation please test samples with activity up to 1000 CPS, if your sample has higher activity you can increase distance between the sample and the spectrometer.

download Apple application: https://itunes.apple.com/us/app/geiger-bot/id427728355?mt=8
download BecqMoni freeware software: http://blog.livedoor.jp/kabuworkman-becqmoni/
download PRA freeware software: http://www.physics.usyd.edu.au/~marek/pra/index.html

Cs-137 Gamm Spectrum

ENCLOSURE: The spectrometer build with engineering grade aluminum enclosure and has internally installed magnetic shield for PMT. Has heavy duty illuminated On/Off button, SMA jack signal output, DC jack for charging with charge status LED. Includes two rubber vibration protection rings for comfortable placement on surface. Dimensions of the enclosure: length ~280mm, diameter ~56mm

iPAD ADAPTER PCB: Device comes with miniature DIY PCB adapter for iPad/iPhone. The adapter has 2 audio jacks that are connecting audio mono cable to TRRS Apple output. The PCB adapter has small potentiometer that helps to adjust signal level to the required on iPhone/iPad input. 

1pcs of Gamma Ray Spectrometer with aluminum enclosure
1pcs iPad/iPhone DIY adapter PCB

1pcs SMA to USB charging cable
1pcs Signal SMA cable


The item is fragile! NaI(Tl) crystals cannot be used in fast changing temperature enviroment. For calibation you have to hold weak calibration source of Cs-137 that can be obtained legally from companies like Spectrum Techniques or Ritverc. We'll help you for the first setup with MCA software if you need technical support.

This item is also promoted on eBay with eBay fees added, if you feel more comfortable purchasing through eBay please follow the link:


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