Title :
Gamma ray irradiation tests of high-Tc SQUID
Author :
Nagaishi, Tatsuoki ; Ara, Katsuyuki ; Morita, Yosuke ; Itozaki, Hideo
Author_Institution :
Dev. Div., Sumitomo Electr. Hightechs Co. Ltd., Hyogo, Japan
fDate :
6/1/2003 12:00:00 AM
Abstract :
Gamma ray irradiation tests on high-Tc SQUIDs were carried out to examine their behavior under nuclear reactor environments. The SQUIDs were made of HoBa2Cu3O7-x superconducting thin films on SrTiO3 substrates. Some were encapsulated in glass fiber reinforced epoxy resin. Gamma ray irradiation was performed with a Co-60 gamma ray source. Irradiation dose rates used were 8.1 to 12.2×103 Gy/h (1.0 to 1.5×106 R/h) and the maximum absorption dose was about 10.4 MGy. During and after the irradiation, the noise of the output of the SQUIDs was measured with a power spectrum analyzer. The modulation voltage did not change until a total irradiation dose of about 3 MGy, after which it decreased slightly. We conclude that high-Tc SQUIDs are resistant to gamma ray irradiation and thus the application of high-Tc SQUIDs as sensors for reactor component inspection is promising.
Keywords :
SQUIDs; gamma-ray effects; high-temperature superconductors; inspection; nondestructive testing; nuclear reactor maintenance; superconducting device testing; superconducting thin films; 10.4 MGy; 3 MGy; Co-60 gamma ray source; HBCO superconducting thin films; HTS SQUID; HTS thin films; HoBa2Cu3O7-x-SrTiO3; NDT; SrTiO3; SrTiO3 substrates; gamma ray irradiation tests; glass fiber reinforced epoxy resin; high-Tc SQUID; high-Tc thin films; nuclear reactor environments; radiation-resistant characteristics; reactor component inspection; Electromagnetic wave absorption; Epoxy resins; Glass; Noise measurement; Power measurement; SQUIDs; Spectral analysis; Superconducting device noise; Superconducting thin films; Testing;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2003.813698
