Ground calibrations of Nuclear Compton Telescope

Jeng Lun Chiu, Zong Kai Liu, Mark S. Bandstra, Eric C. Bellm, Jau Shian Liang, Daniel Perez-Becker, Andreas Zoglauer, Steven E. Boggs, Hsiang Kuang Chang, Yuan Hann Chang, Minghuey A. Huang, Mark Amman, Shiuan Juang Chiang, Wei Che Hung, Chih Hsun Lin, Paul N. Luke, Ray Shine Run, Cornelia B. Wunderer

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations


The Nuclear Compton Telescope (NCT) is a balloon-borne soft gamma ray (0.2-10 MeV) telescope designed to study astrophysical sources of nuclear line emission and polarization. The heart of NCT is an array of 12 cross-strip germanium detectors, designed to provide 3D positions for each photon interaction with full 3D position resolution to < 2 m̂3. Tracking individual interactions enables Compton imaging, effectively reduces background, and enables the measurement of polarization. The keys to Compton imaging with NCT's detectors are determining the energy deposited in the detector at each strip and tracking the gamma-ray photon interaction within the detector. The 3D positions are provided by the orthogonal X and Y strips, and by determining the interaction depth using the charge collection time difference (CTD) between the anode and cathode. Calibrations of the energy as well as the 3D position of interactions have been completed, and extensive calibration campaigns for the whole system were also conducted using radioactive sources prior to our flights from Ft. Sumner, New Mexico, USA in Spring 2009, and from Alice Springs, Australia in Spring 2010. Here we will present the techniques and results of our ground calibrations so far, and then compare the calibration results of the effective area throughout NCT's field of view with Monte Carlo simulations using a detailed mass model.

Original languageEnglish
Title of host publicationSpace Telescopes and Instrumentation 2010
Subtitle of host publicationUltraviolet to Gamma Ray
StatePublished - 2010
EventSpace Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray - San Diego, CA, United States
Duration: 28 Jun 20102 Jul 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceSpace Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray
Country/TerritoryUnited States
CitySan Diego, CA


  • Compton imaging
  • Gamma-ray astronomy detectors
  • Gamma-ray imaging
  • Germanium radiation detectors


Dive into the research topics of 'Ground calibrations of Nuclear Compton Telescope'. Together they form a unique fingerprint.

Cite this