TY - JOUR
T1 - Study of the liquid-methane ionization chamber
AU - Tanaka, Hiroki
AU - Ariyoshi, Tetsuya
AU - Uemura, Takeshi
AU - Arima, Hidehiko
AU - Maehata, Keisuke
AU - Ishibashi, Kenji
AU - Matsumoto, Yuzuru
PY - 2005/3/1
Y1 - 2005/3/1
N2 - A liquid-methane ionization chamber has potential for high-efficiency neutron detection. As a preliminary study, we constructed a liquid-methane ionization chamber to examine the response to γ-rays, α particles and neutrons. The chamber consisted of three disk-shaped parallel-plate electrodes immersed in liquid methane. Pulse height distributions were obtained using a charge-sensitive preamplifier to detect γ-rays emitted from 60Co, 22Na and 137Cs sources. The concentration of oxygen, an impurity in the liquid methane, was evaluated using an inverse electric-field method that made use of the large collection characteristics of ionized electrons generated by γ-rays. The response of the liquid-methane chamber to γ-rays was analyzed by searching for the position of the Compton-edge in the pulse-height distributions obtained for γ-rays of 1275 and 662 keV emitted by 22Na and 137Cs, respectively. The full-energy peak appeared in the pulse-height distribution of the output signals for the detection of α particles emitted by 241Am. A continuous pulse-height distribution was observed for neutrons emitted from an Am-Be source.
AB - A liquid-methane ionization chamber has potential for high-efficiency neutron detection. As a preliminary study, we constructed a liquid-methane ionization chamber to examine the response to γ-rays, α particles and neutrons. The chamber consisted of three disk-shaped parallel-plate electrodes immersed in liquid methane. Pulse height distributions were obtained using a charge-sensitive preamplifier to detect γ-rays emitted from 60Co, 22Na and 137Cs sources. The concentration of oxygen, an impurity in the liquid methane, was evaluated using an inverse electric-field method that made use of the large collection characteristics of ionized electrons generated by γ-rays. The response of the liquid-methane chamber to γ-rays was analyzed by searching for the position of the Compton-edge in the pulse-height distributions obtained for γ-rays of 1275 and 662 keV emitted by 22Na and 137Cs, respectively. The full-energy peak appeared in the pulse-height distribution of the output signals for the detection of α particles emitted by 241Am. A continuous pulse-height distribution was observed for neutrons emitted from an Am-Be source.
UR - http://www.scopus.com/inward/record.url?scp=13944278897&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=13944278897&partnerID=8YFLogxK
U2 - 10.1016/j.nima.2004.10.033
DO - 10.1016/j.nima.2004.10.033
M3 - Article
AN - SCOPUS:13944278897
VL - 539
SP - 613
EP - 621
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
SN - 0168-9002
IS - 3
ER -