A new gamma-ray detector with gold-plated gas electron multiplier

作者：Koike Takahisa^*; Uno Shoji; Uchida Tomohisa; Sekimoto Michiko; Murakami Takeshi; Miyama Koich; Shoji Masayoshi; Fujiwara Takuya; Nakano Eiichi; Chiba Junsei

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2011, 648(1): 180-185.

DOI：10.1016/j.nima.2011.05.071

• Gold-plated GEM foil
• Gamma camera
• Geant4 simulation

For biomolecular analysis and nuclear medicine, we are developing a novel gamma camera based on a gaseous detector that uses gas electron multipliers (GEMs). To increase the gamma-ray-detection efficiency, we have constructed a novel GEM foil. The gamma-ray-conversion layers of the GEM foils are plated with 3 pm of gold on both surfaces. To evaluate the detection efficiency of the gamma-ray energy that corresponds to (99m)Tc, which is the target isotope for our gamma camera, the measurements were performed using (241)Am and (57)Co as gamma-ray sources. Our measured detection efficiency was 0.81% ((241)Am) and 0.75% ((57)Co) for the sources, which agreed well with a Monte Carlo simulation based on Geant4. In addition, we were able to increase the efficiency using multiple gold-plated GEM foils.

• 出版日期2011-8-21