SYMPOSIA PAPER Published: 01 January 2001

A Laser Compton-Scattered Photon Source for Potential Calibration of Gamma-Ray Detectors in the Energy Range from 2 to 22 MeV


A laser-Compton-scattered (LCS) photon beam was used as the source of quasimonoenergetic photons in the energy range from 2 to 22 MeV. Second-harmonic light (527 nm) from a Nd:YLF laser was guided into the interaction region in a electron storage ring, TERAS (800 MeV, 300 mA). High energy photons back-scattered by relativistic electrons were collimated by a lead collimator with a reentrant hole 2 mm in diameter. The photon fluence was measured by a large coaxial Ge detector. To determine the energy distribution of a photon beam and the response function of a Ge detector, the EGS4/PRESTA-CG code was used taking into account the precise overall computational model. Results showed that, at a photon energy of 5.965 MeV, the calculated pulse height spectra agreed very well with experimental data.

Author Information

Kudo, K
Electrotechnical Laboratory, Ibaraki, Japan
Takeda, N
Electrotechnical Laboratory, Ibaraki, Japan
Ohgaki, H
Electrotechnical Laboratory, Ibaraki, Japan
Toyokawa, H
Electrotechnical Laboratory, Ibaraki, Japan
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Developed by Committee: E10
Pages: 721–728
DOI: 10.1520/STP13662S
ISBN-EB: 978-0-8031-5450-6
ISBN-13: 978-0-8031-2884-2