Speaker
Kiwamu Saito
(KEK)
Description
A position sensitive He-3 proportional counter has been used in experiments
of neutron diffraction and so on. However, the detector is not applied to use
in high counting neutron fields because the time resolution of the detector is
in order of several microseconds. One of the efficient solutions to this
problem is a use of scintillation in helium. However, scintillation photons in
He2 ∗ lie in VUV region and He2 ∗ has a long decay time. In order to solve
these problems, we have been studying to exchange a luminescence origin
from helium to xenon by adding a small amount of xenon to helium. A
purpose of this study is to understand scintillation property in helium mixed
with xenon, such as luminescence spectra, time profile and scintillation
yield, and is to develop a 2-dimention position sensitive thermal neutron
detector using He/Xe mixture. In order to understand the basic property of
scintillation in He/Xe mixture He-4 gas was used. We found that the
luminescence spectra of scintillation in He/Xe mixture shifted to the
wavelength region of 150-200nm. The scintillation intensities were
measured using a PMT sensitive to photons with wavelength of 115-300nm.
In the case that the partial pressure of xenon was 0.01 MPa in He/Xe
mixture at 1.0 MPa, the scintillation yield was almost equal to that in pure
xenon of 0.1 MPa.
Primary author
Kiwamu Saito
(KEK)
