Ultrasonic attenuation mesurements were carried out in neutron irradia
ted quartz after heat treatment. Contrary to previous findings the new
data do not show evidence for a change in the distribution of the rel
axation times of the tunneling states. The studied neutron dose is in
the so called threshold region. The results can be understood in view
of the microscopic model previously put forward for the TS in neutron
irradiated quartz.