horygcon r aly SSS -— Ft Project 8,1 ~ Basic Thermal Radiation Measurenents - WB. Plum NP XSCTIVE prea) The principle objective of Project 8.1 was to measure the irradiance 2s a function of time, thermal radiant energy, and the spectral distri- bution of the thermal radiant energy from a kiloton-range surface burst 2nd compare these data with corresponding data from tower shots. INSTRUMENTATION The NRDL radiometer and the NRDL calorimeter with appropriate filters were used to measure the thermal radiation at Station 815.01 (8,121 ft from GZ) on YVONNE and at Station 212.02 (14,392 ft from GZ) on WILMA, The data were recorded on Heiland oscillographic recorders, two of whic vere placed at cach station. as Fach recorder gave a time history plot for sch of the following instruments: (1) Total energy, quaetz filter, 9 degree field of vwew (2) Totel easrgy, quartz filter, 90 degree field of view (3) Cpectral, 3-59 filter, 90 degree field of view (4) Spectral, 2-58 filter, 90 degree field of view (5) Spectral, RG-8 filter, 90 degree field of view (6) Gpectral, 7-56 filter, 90 degree field (7) Field of view, quartz filter, ll deg field of wew (8) Field of view, quartz filter, 22 degree field of view (9) Field of view, quartz filter, 45 degree field of view (10) Field of view, quartz filter, 90 degree field of view (11) Field of view, quartz filter, 160 degree field of view (12) Radioneter, quartz filter, 90 degree field of view of view