Biomedical subjects

M Ikeya

Publications and source records attributed to M Ikeya.

22 records · Page 2Linked to original sources

PubMedDate not supplied

Electron spin resonance of bloodstains and its application to the estimation of time after bleeding.

The degradation of blood constituents in unheparinized dry blood was studied with electron spin resonance (ESR) at various temperatures. The intensity of ESR signals of methemoglobins, non-heme irons and organic radicals in dried human blood increases with time. Considering the kinetics of the signal growth, the formation mechanism of the paramagnetic species was discussed. The ESR signal (g = 4.3) of non-heme iron is usable in estimating the time after bleeding or injury using bloodstains.

Animals↗

PubMedDate not supplied

ESR cavities for in vivo dosimetry of tooth enamel.

TM110 mode and TE111 mode ESR microwave cavities for in vivo human tooth dosimetry are developed. ESR signal from a sample is measured by using microwave leak from the pin hole on the cavity wall. The minimum detectable dose of 2 Gy is obtained by the signal accumulation for 100 sweeps.

Dental Enamel↗

PubMedDate not supplied

Applications of microwave scanning ESR microscope: human tooth with metal.

A microwave scanning ESR microscope has been developed to study the distribution of paramagnetic ions or radicals in various materials, especially in minerals. The microwave scanning microscope consists of a cavity with an aperture over which a sample is moved using mechanical stages and computer-controlled stepping motors. The EPR signal intensities at all positions are composed on a CRT display as an image. A new TE111-mode cylindrical cavity system was designed to obtain better sensitivity and resolution. ESR images of gamma-rayed human teeth were obtained to study the effect of secondary electrons from the adjacent metal on the defect formation in a tooth.

Electron Spin Resonance Spectroscopy↗

PubMedDate not supplied

ESR dosimetry of a deceased radiation worker.

A case of overexposure of an industrial radiographer using 192Ir sources and having a filmbadge dosimeter record of 104 mSv has been examined with ESR dosimetry of postmortem tooth and bone specimens. ESR measurements of the tooth enamel showed an intense signal of CO2- and gave the equivalent dose (ED) of 14 Gy by the additive dose method using gamma-rays from a source of 60Co. The doses for a finger bone and humerus were 14.7 and 7.0 Gy, respectively. It was concluded that he had been exposed to radiation repeatedly over 10 yr and that ESR dosimetry can give a life-long cumulative dose for personnel using radiation.

Bone and Bones↗