ELECTRON-SPIN RELAXATION-TIMES OF IRRADIATED ALANINE

被引:22
作者
NAKAGAWA, K
EATON, SS
EATON, GR
机构
[1] Department of Chemistry, University of Denver, Denver
关键词
ELECTRON SPIN RELAXATION; ELECTRON SPIN ECHO; SATURATION RECOVERY; IRRADIATED ALANINE;
D O I
10.1016/0969-8043(93)90198-J
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Crystalline alanine samples were irradiated with Co-60 gamma-rays with doses of 2.7, 11, 60, or 100 kGy. The radicals produced per 100 eV of radiation (G) was dose dependent and systematically higher for L-alanine than for DL-alanine. The value of the electron spin-lattice relaxation time (T(l)) for the room temperature persistent radical is ca. 20 to 50 mus. at X-band (ca. 9.1 GHz) - the longer values were observed near the center of the spectrum. At X-band the electron spin phase memory time T(m) is 100 to 200 ns, depending on radiation dose. For a given dose, T(l) and T(m) are longer for DL-alanine than for L-alanine. The CW EPR linewidth is not relaxation determined and the CW EPR signal is easily saturated. Hence, caution must be exercised when EPR is used for quantitative radiation dosimetry. Relaxation times are shorter at S-band than at X-band.
引用
收藏
页码:73 / 76
页数:4
相关论文
共 13 条
  • [1] FRONCISZ W, UNPUB
  • [2] GOTTSCALL WC, 1968, ADV CHEM SER, V81, P374
  • [3] HOFER P, 1989, APPL RADIAT ISOTOPES, V40, P1233, DOI 10.1016/0883-2889(89)90070-1
  • [4] COMPUTER-CONTROLLED PULSED ELECTRON-PARAMAGNETIC-RESONANCE SPECTROMETER
    MAILER, C
    DANIELSON, JDS
    ROBINSON, BH
    [J]. REVIEW OF SCIENTIFIC INSTRUMENTS, 1985, 56 (10) : 1917 - 1925
  • [5] RADIOLYSIS OF SOLID L-ALPHA-ALANINE
    MINEGISHI, A
    SHINOZAKI, Y
    MESHITSUKA, G
    [J]. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 1967, 40 (05) : 1271 - +
  • [6] PULSED EPR SPECTROMETER .2.
    PERCIVAL, PW
    HYDE, JS
    [J]. REVIEW OF SCIENTIFIC INSTRUMENTS, 1975, 46 (11) : 1522 - 1529
  • [7] PULSED ELECTRON-PARAMAGNETIC-RES SPECTROMETER
    QUINE, RW
    EATON, GR
    EATON, SS
    [J]. REVIEW OF SCIENTIFIC INSTRUMENTS, 1987, 58 (09) : 1709 - 1723
  • [8] QUINE RW, 1992, IN PRESS REV SCI INS
  • [9] REGULLA D F, 1989, Applied Radiation and Isotopes, V40, P829
  • [10] DOSIMETRY BY ELECTRON-SPIN-RESONANCE SPECTROSCOPY OF ALANINE
    REGULLA, DF
    DEFFNER, U
    [J]. INTERNATIONAL JOURNAL OF APPLIED RADIATION AND ISOTOPES, 1982, 33 (11): : 1101 - +