Isomerization behavior of spiropyran-based compounds upon X-ray irradiation. (November 2017)

• Record Type: Journal Article
• Authors: Asai, K.; Koshimizu, M.; Fujimoto, Y.; Asai, K.
• Is Part Of: Radiation measurements. Volume 106(2017:Nov.)
• Page Start: 166
• Page End: 169
• Publication Date: 2017-11
• Subjects: Photochromism -- Dosimeter -- X-ray -- Radiation therapy -- Tissue-equivalent -- Radiation imaging; Nuclear emulsions -- Periodicals; Particle tracks (Nuclear physics) -- Periodicals; Thermoluminescence -- Periodicals; Cosmic rays -- Periodicals; Radiation -- Measurement -- Periodicals; Radiometry -- Periodicals; Radiation Monitoring -- Periodicals; Émulsions nucléaires -- Périodiques; Particules (Physique nucléaire) -- Traces -- Périodiques; Thermoluminescence -- Périodiques; Rayonnement cosmique -- Périodiques; Radiométrie -- Périodiques; 539.77
• DOI: 10.1016/j.radmeas.2017.05.016
• Languages: English
• ISSNs: 1350-4487

Abstract

Abstract: We investigated the isomerization behavior of 1, 3, 3-trimethylindolino-6'-nitrobenzopyrylospiran (6-nitro BIPS) upon X-ray irradiation with the aim of developing tissue equivalent imaging sensor materials. We fabricated polymer films incorporated with 6-nitro BIPS. Also, we investigated the effect of the addition of the organic phosphor, b-PBD. Increase in the absorbance at 580 nm was observed at X-ray irradiation doses in the range 1–20 kGy. The increase of the absorbance as function of the dose is enhanced 1.5 times by the addition of b-PBD at 5.0 wt%. These results indicate that 6-nitro BIPS exhibits photochromism with direct excitation by X-rays, and that the photochromism behavior can be sensitized by the fluorescence from b-PBD. Highlights: An organic dose imaging sensor has been developed using photochromic molecules. Isomerization behavior of the photochromic molecule is observed under X-ray irradiation. The isomerization behavior is sensitized with fluorescence from an organic phosphor.