Construction and Testing of a Low-power Cryostat for MARS

Aalseth, Craig E. ; Caggiano, Joseph A. ; Day, Anthony R. ; Fast, James E. ; Fuller, Erin S.

Pacific Northwest National Laboratory (U.S.)

关键词: Copper;    Platinum;    46 Instrumentation Related To Nuclear Science And Technology;    Radiation Detectors;    36 Materials Science;   

DOI  :  10.2172/1027195
RP-ID  :  PNNL-16922
RP-ID  :  AC05-76RL01830
RP-ID  :  1027195

美国|英语

来源: UNT Digital Library

【 摘 要 】

A low-power cryostat was designed and built for the Multi-sensor Airborne Radiation Survey (MARS) project for the purpose of housing a close-packed high-purity germanium (HPGe) detector array of 14 HPGe detectors. The power consumption of the cold mass in the cryostat was measured to be 4.07(11) watts, sufficient for 5.5 days of continuous operation using only 8 liters of liquid nitrogen. Temperatures throughout the cryostat were measured by platinum resistance temperature detectors. These measurements were used to determine the emissivity of the copper used in the floating radiation shield and outer cryostat wall, which was constructed using chemically cleaned and passivated copper metal. Using a PNNL-developed passivation process, an emissivity of 2.5(3)% was achieved for copper.