
We use these response functions to unfold the distributions to obtain flux spectra. By fitting the pulse-height distributions from the sources with a function containing 17 parameters, we determined theoretical repsonse functions. The system was very carefully calibrated and characterized from 0.1 to 8.3 MeV using gamma-ray spectra from a variety of radioactive sources.

Gamma-ray pulse-height distributions are acquired simultaneously for up to eight positions. Our system consists of a LeCroy 3500 data acquisition system with a built-in CAMAC crate and eight bismuth-germanate detectors 7.62 cm in diameter and 7.62 cm long.

Fieldable computer system for determining gamma-ray pulse-height distributions, flux spectra, and dose rates from Little Boy
