| Sumari: | The Pohang Neutron Facility, which consists of an electron linear accelerator, a water-cooled Ta
target with a water moderator, and a time-of-flight path with an 11-m length, was constructed to measure
neutron total cross-sections in the neutron energy region from thermal to several hundreds of eV by using
the time-of-flight method. In order to utilize this pulsed neutron facility based on an electron linac, we have
to understand the characteristics of the radiation fields produced in this facility. We used the multiple-foil
activation method to measure the neutron and the photon distributions produced by a water-cooled Ta target
with and without the water moderator.
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