Application of gamma radiation for disinfection of fungi in a large volume of historical archives damaged by flood following Typhoon Hagibis 2019, Japan: A case report

Q4 · BIOLOGY

Article

Author: HIRONIWA, TAKAYUKI ; KUMEDA, YUKO ; FURUTA, MASAKAZU ; MATSUSHITA, MASAKAZU ; LINH, NGUYEN THI THUY

A large volume of historical archives was extensively damaged by flood water, following Typhoon Hagibis in Fukushima, Japan, in October 2019. They were rescued from the stricken area within a week, however, the prolonged exposure of paper documents to water caused severe biodegradation by fungal growth. To disinfect fungi, the paper documents were exposed to gamma radiations emitted by a source of Cobalt 60 by the industrial irradiation service. The wet paper documents were mainly contaminated with hydrophilic and cellulolytic fungi, including Trichoderma, Stachybotrys, and Fusarium; no fungi grew after irradiation. These results indicated that the average absorbed dosage from 13.1 kGy to 16.1 kGy were sufficient to disinfect paper documents heavily contaminated with fungi. In the present study, we demonstrated the successful practical use of irradiation in fungi-damaged paper documents using a commercial gamma-irradiation facility.

15 Aug 2017·Bulletin of the Chemical Society of Japan

Relationship between Crystal Structures and Thermoluminescence Spectra of Gamma-Irradiated Shells of Shellfish Measured with a Multichannel Fourier-Transform Luminescence Spectrometer

Author: Ishii, Hiroshi ; Nakata, Munetaka ; Hironiwa, Takayuki ; Shonaka, Moe ; Akai, Nobuyuki

AbstractThermoluminescence spectra of gamma-irradiated shells of oysters, scallops, mussels, littleneck clams, and freshwater clams are measured with a multichannel Fourier-transform luminescence spectrometer. Oysters, scallops, and mussels isothermally heated at 200 °C show strong luminescence due to the electronic transition of Mn2+, which is included as an impurity in shells and excited to a metastable state by gamma-ray irradiation. Littleneck clams and freshwater clams show very weak thermoluminescence under the same experimental conditions and show strong thermoluminescence owing to phase transition when they are heated at 450 °C before gamma-ray irradiation. The phase transition of the crystal structures from aragonite to calcite is monitored by infrared spectroscopy.

01 Jan 2017·RADIOISOTOPES

Detection Method of Gamma-Ray Irradiation History of Shellfish by Thermoluminescence Spectra

Author: Ishii, Hiroshi ; Nakata, Munetaka ; Hironiwa, Takayuki ; Shonaka, Moe

The purpose of the present study is to establish a new convenient detection method for γ-ray irradiation history.To measure very weak thermal emission spectra of γ-irradiated seashells, a new multichannel Fourier-transform chemiluminescence spectrometer, an interferometer of which is composed of a Savart plate, a quartz lens, and two linear polarizers, was used.When irradiated mussel shells were cleaned by water, crushed by a freezing crusher, and heated at 473 K, spatial interferogram was obtained from signals on each CCD pixel, which was converted to thermal emission spectra by Fourier transformation.The observed spectra were modeled with one Gaussian curve by least-squares fitting, showing a peak position at about 641 nm.We found that the spectral intensity depends on the dose of γ-ray irradiation and the history of 0.1 kGy irradiation is detectable.In addition, the emission spectrum of a sample washed by only water was found to be similar to that washed by 5% NaOCl solution, meaning that the washing by the solution is not required.The method proposed in the present study is expected to develop as a new convenient method to know the γ-ray irradiation history of seashells.

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