Journal of Radiation Research and Radiation Proces ›› 2018, Vol. 36 ›› Issue (5): 50801-050801.doi: 10.11889/j.1000-3436.2018.rrj.36.050801

• RADIATION PHYSICS • Previous Articles    

Influence of position and mass of glass sample on electron paramagnetic resonance measurement

LIU Yulian1, HUO Menghui1, PANG Xinxin2, YAN Changxin1, ZHANG Wenyi1, JIAO Ling1   

  1. 1. Institute of Radiation Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China;
    2. Radiation environmental management of Tianjin City, Tianjin 300191, China
  • Received:2018-08-25 Revised:2018-11-27 Online:2018-10-20 Published:2018-10-29
  • Supported by:

    Supported by Natural Science Foundation of Tianjin (16JCZDJC36100), Medical and Health Technology Innovation Project of Chinese Academy of Medical Sciences (2017-I2M-1-016)

Abstract:

The paramagnetic resonance spectroscopy technique was used to detect the electron paramagnetic resonance (EPR) signal intensity and Q-factor at different positions in the resonant cavity of a glass sample, as well as with increasing glass mass. The results showed that the signal intensity at various distances from the center of the resonant cavity follows a normal distribution:at the center of the resonant cavity, the signal intensity was the highest, while the farther away from the center, the lower the signal sensitivity and the smaller the signal intensity. Serious signal distortion started at ≥ 4 mm or ≤ -4 mm from the center, and the signal intensity and Q-factor at negative positions were higher than those at the positive symmetry positions. The signal intensity increased with increase in the glass mass, reaching saturation at approximately 100 mg. The Q-factor decreased with increasing mass and changed with different positions and directions. Therefore, taking into account the maximization of signal intensity and signal-to-noise ratio, and minimization of mass and position effects, the optimal detection position is at the resonant cavity center (±2 mm), with the best sample mass ≤ 100 mg.

Key words: Electron paramagnetic resonance (EPR), Signal-to-noise ratio, Signal strength, Cavity, Q-factor

CLC Number: 

  • TL72