Development of 3-d position-sensitive microcalorimeters for gamma rays

2014 Fiscal Year Final Research Report

• Project/Area Number: 23360422
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nuclear engineering
• Research Institution: Kyushu University
• Principal Investigator: IYOMOTO Naoko 九州大学, 工学(系)研究科(研究院), 准教授 (40508173)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: 放射線 / 超伝導材料・素子 / 低温物性

Outline of Final Research Achievements

We are developing Transition-Edge Sensor (TES) microcalorimeters for gamma-ray detection. We have fabricated a device with a bismuth absorber of a volume of 0.5 mm x 1 mm x 1 mm . The energy resolution of the device was 4.1 keV at 662 keV, while its baseline energy resolution was 3.2 keV. These resolutions are more than an order of magnitude worse than its design value. It was because the device suffered from thermal noise due to the gamma rays scattered by the silicon substrate. We also fabricated a position-sensitive TES microcalorimeter, but it was not possible to detect signals from the device because the device also suffered from the noise and because the transition temperature of the TESs was too high.

Free Research Field

放射線計測