Application of Photo Acid Generators for .GAMMA. Rays Detective Materials.

Abstract

The sensitivities to y rays were investigated for photo acid generators : N sulfonyloxy phthalimide 2, 1V sulfonyloxy succinimide 3, 1V sulfonyloxy l,8-naphthalimide 4, N tosyloxy 5-norbomene-2,3-dicarboximide 5, triphenylsulfonium trifluoromethanesulfonate 6, diphenyliodonium chloride 7 and chloroform 8. The acid generation efficiency was monitored by the use of acid sensitive dye, fluoran dye la. The efficiency for y irradiation decreased in the order 7 > 2 > 6 > 5 > 3 > 4. In the case of 8, decomposition of la was accompanied. 7 and 8 were of no practical use because volatile hydrogen chloride was generated. The others (2-6) generate methanesulfonic acid, p-toluenesulfonic acid or trifluoromethanesulfonic acid which are not so volatile acid as hydrogen chloride. 1V sulfonyloxy imide compounds (2-5) have an advantage for practical use as dosimeter because these reagents dissolve in either polar or nonpolar solvent.

Modification of chitosan onto PE by irradiation in salt solutions and possible use as Cu2+ complex film for pest snail control

“…Therefore, the conjugating reaction through free radical system readily occurred . It is important to note that imide and triazole compounds are known as photo acid generators, which are found in chemically amplified photoresists because of their high photosensitivity . The γ‐radiation or photon with the energy exceeding the ionizing potential (∼5 eV) of the photoresist (i.e., NHS and HOBt) can eject electron.…”

Development of radiochromic dosimeters based on polyvinyl chloride films containing 2′-anilino-6′-di-n-pentylamino-3′-methylfluoran (Black305)

“…17) Dosimeter materials composed of leuco-fluorans and photoacid generators, with a lower limit of detection of 10 Gy, have been reported. 25,26) We have developed a new purpose-designed 3D dosimeter using a radiochromic material and 3D printing technology with the specific objective of measuring a dose distribution more accurately in radiotherapy. 27) However, the radiochromic material does not have sufficient sensitivity; the material changes its color at a dose of tens of Gy, whereas the dose delivered in a single radiotherapy session is several Gy.…”

Radiation Sensors Based on the Generation of Mobile Protons in Organic Dielectrics

“…In this paper, we report a new sensing scheme that is based on the concept of radiation-induced generation of protons in photoacid-generator (PAG)-containing polymeric gate dielectrics of metal–insulator–semiconductor (MIS)-type devices. Radiation detection systems based on acid generation in solutions or polymeric films containing both a PAG and an acid-sensitive dye, where the generated acid was detected by the color change of the dye, have been reported for the development of γ-ray film dosimeters. , However, the concept of using polymeric films with embedded PAG molecules as radiation-sensitive gate dielectrics of MIS devices, wherein proton generation as a function of the IonR dose is electronically sensed, is fundamentally different from the above ones and has not been explored for the realization of a MIS-type dosimeter.…”