A program for the irradiation of samples-of N-Reactor graphite has been in progress since November 30 1961, in the General Electric Test Reactor (GETR). The basic purpose of the program is to achieve an exposure to the samples equivalent to 20 years of operation of N-Reactor and to relate the physical distortion of the samples to the expected behavior of the N-Reactor moderator stack. Theoretical studies to relate sample exposure in the GETR to exposure in N-Reactor have been underway since the program began. The conversion of exposure depends on three main items: the flux and exposure in the GETR test position; the flux and exposure in the N-Reactor stack; and the relationship of the amount of carbon damage per unit flux in N-Reactor to that in the GETR. To date all three items of the conversion have been based strictly on computer calculations. The first item (the GETR flux) has been calculated as group one, E > 0.18 MeV, of the three-group computation made every reactor cycle by the GETR physics group, This computation is normalized to reactor conditions by comparison of group three, E < 0.17 ev, with measured cobalt-alloy monitors. No direct comparison of group one with …

This document provides the Hanford Production Reactors operating histories from January 1, 1961 through November 30, 1969. The raw log sheets are provided.

Abstracts are provided for presentations in these areas: studies in immunology; studies in molecular biology; experimental and clinical studies of cell differentiation; studies on the blood; general metabolic studies; problems in scanning; clinical and experimental studies on the effects of radiation; and studies with high energy radiations.

This report itemizes the irradiations performed by Testing and Irradiation Services for Battelle-Northwest. It lists the material being irradiated, awaiting disposition and material shipped during the report period. Data are given table form. An explanation of the various columns in the report is given.