Beta/Gamma disk sources

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Disk sources are designed for use as reference sources in laboratories, radiation protection, training and education, security, and up-and-coming technology.


Disk sources are designed for use in various industries including, but not limited to:

  • Laboratories: They are ideal for performing functional checks on gamma counters or spectrometers.
  • Radiation Protection: Disk sources can be used for functional checks and periodic verifications of radiation protection probes and systems.
  • Training and Education: Disk sources can be used to illustrate fundamental concepts in nuclear physics and radiation science. Students can observe and study radioactive decay, half-life, energy spectra, and interactions of radiation with matter.
  • Security: Disk sources are also useful for functional checks and periodic verifications of portable devices used to identify radiological threats and for conducting emergency exercises.


Each disk source is constructed using Plexiglas and is available in two sizes:

  • 0.125 x 1.0 inches (3.2 x 25.4 mm)
  • 0.125 x 2.0 inches (3.2 x 50.8 mm)

The source material deposit will be the same for each size – 2-3 mm in diameter located in the center of the disk.


The maximum deviation of the delivered activity from the nominal values listed is ±20%. For enhanced accuracy, you can opt for a secondary calibration, which is performed against a NIST Traceable source, available for an additional cost. This secondary calibration ensures a maximum deviation of only ±5% from the labeled activity. Please note that beta sources are not available for calibration.

Spectrum Techniques, established in 1993, specialises in the production of nuclear counting equipment and U.S. NRC ‘Exempt Quantity’ radioactive sources. The product lineup encompasses an extensiv...