In this work attempts have been made to introduce a new application fo
r CR-39 solid state nuclear track detector (SSNTD) to measure the ther
mal neutron flux distribution of the external neutron beam in a powder
neutron diffractometer (PND) system using boric acid converter. Also
a neutron radiography film with Gadolinium converter have been applied
to measure the neutron flux distribution in order to compare and rech
eck the results obtained by the previous method.