1 Recent Radiation Test Results at JPL
This Bruce E. Pritchard, Member, ZEEE, Bemard G. Rax, and Steven S. McClure paper documents recent TID (including ELDRS) and proton damage test results obtained by JPL. Unusual test results, such as abnormally low or high failure levels or unusual failure or response mechanism, are emphasized.
Total ionizing dose (TID) evaluation results of low dose rate testing for NASA programs
Low dose rate radiation testing in the range of 0.01-0.20 rads(Si)/s has been performed at Goddard Space Flight Center on a wide variety of non-RH (rad-hard) part types in the last few years. This paper reports on recent test results of EEPROMs, Operational Amplifiers, Analog-to-Digital Converters (ADCs) and Digital-to-Analog Converters (DACs), and DC-DC converters. These results have shown that non-RH parts are suitable for many low earth orbiting satellites, where predicted mission total dose requirements may be in the range of 0.5-10 krads(Si). However, a careful characterization of non-RH parts should be performed to verify that the parts meet the requirements of their intended application in the projected mission radiation environment.
Developmental aphasia: The perception of brief vowels and extended stop consonants
Abstract Developmental dysphasics and matched controls were examined for their ability to discriminate (a) two synthesized vowel-vowel syllables and (b) two synthesized consonant- vowel syllables. For both vowels and consonants, dysphasics were impaired when the discriminable components of the two stimuli were brief (43 msec) but unimpaired when these components were 95 msec or longer. It is concluded that developmental dysphasics have no difficulty in discriminating transitional auditory information as such and that their impaired discrimination of synthesized stop consonants is attributable solely to the brief duration of the discriminable components.