During the first half of FY-1968, a test irradiation of neptunium was performed in KE Reactor. The basic objectives of this test were to show the reactor capability for irradiating neptunium target elements in an elevated flux; demonstrate the charge-discharge of several of the target columns during reactor operation; and establish the Pu-238 production characteristics of the K-type reactor. These objectives were successfully met. This document reports the results and conclusions derived in meeting the third objective -- establishing K reactor Pu-238 production characteristics.