Spin concentration in a possible ESR dosimeter: An electron spin echo study on X-irradiated ammonium tartrate

被引:29
作者
Brustolon, M
Zoleo, A
Lund, A
机构
[1] Univ Padua, Dept Phys Chem, I-35131 Padua, Italy
[2] Linkoping Univ, Dept Phys & Measurement Tech, S-58183 Linkoping, Sweden
关键词
electron spin resonance; electron spin echo; ESR dosimetry; ammonium tartrate; electron spin relaxation;
D O I
10.1006/jmre.1998.1671
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
Several single crystals and powder samples of ammonium tartrate, recently proposed as a possible ESR dosimeter, have been X-irradiated with different doses. The total radical concentration has been determined by quantitative cw ESR, by comparison with a standard. The samples have been studied by electron spin echo spectroscopy. The two-pulse echo decay has been obtained and simulated by a single exponential function for different values of the microwave power of the pulses and for different pulse lengths. The dependence of the phase memory time T-M on the microwave power has been exploited to get information on the contribution of the instantaneous diffusion to spin dephasing. At room temperature in the range of radical concentrations of 10(18)-10(19) spins/cm(3) the instantaneous diffusion is the dominant spin dephasing mechanism. The linear dependence of the instantaneous diffusion on the total concentration of the radicals is in agreement with the theory. From the latter result we conclude that the average radical-radical distance corresponds to a random distribution of the radicals in the matrix. A simple method of measuring the radical concentration by the ESE decays in powder samples of irradiated ammonium tartrate is described, (C) 1999 Academic Press.
引用
收藏
页码:389 / 396
页数:8
相关论文
共 23 条
  • [11] IRRADIATED FUSED-QUARTZ STANDARD SAMPLE FOR TIME-DOMAIN EPR
    EATON, SS
    EATON, GR
    [J]. JOURNAL OF MAGNETIC RESONANCE SERIES A, 1993, 102 (03) : 354 - 356
  • [12] TRANSIET NUCLEAR INDUCTION AND DOUBLE NUCLEAR RESONANCE IN SOLIDS
    HERZOG, B
    HAHN, EL
    [J]. PHYSICAL REVIEW, 1956, 103 (01): : 148 - 166
  • [13] KUNZ F, 1998, J CHIM PHYS PHYS CHI, V95, P796
  • [14] SPATIAL-DISTRIBUTION OF FREE-RADICALS IN GAMMA-IRRADIATED ALCOHOL MATRICES DETERMINED BY THE 2+1 ELECTRON-SPIN ECHO METHOD
    KURSHEV, VV
    RAITSIMRING, AM
    ICHIKAWA, T
    [J]. JOURNAL OF PHYSICAL CHEMISTRY, 1991, 95 (09) : 3564 - 3568
  • [15] OLSSON SK, 1999, IN PRESS APPL RAD IS
  • [16] Raitsimring A. M., 1974, Soviet Physics - Solid State, V16, P492
  • [17] Romanelli M, 1997, CONCEPT MAGNETIC RES, V9, P403, DOI 10.1002/(SICI)1099-0534(1997)9:6<403::AID-CMR3>3.3.CO
  • [18] 2-H
  • [19] Alanine radicals: Structure determination by EPR and ENDOR of single crystals X-irradiated at 295 K
    Sagstuen, E
    Hole, EO
    Haugedal, SR
    Nelson, WH
    [J]. JOURNAL OF PHYSICAL CHEMISTRY A, 1997, 101 (50) : 9763 - 9772
  • [20] Salikhov K. M., 1979, TIME DOMAIN ELECT SP, P231