Using electron spin resonance (ESR) spectroscopy, we revealed heating effects on irradiated pepper. The representative ESR spectrum of the irradiated pepper is consisted of four components a sextet centered at g=2.0, a singlet at the same g-value, a singlet at g=4.0 and side peaks near g=2.0. The first one is attributable to a signal with hyperfine (hf) interactions of Mn2+ (hf constant=7.4 mT) . The second one is due to an organic free radical that is induced by the γ-ray irradiation. The third one may originated from Fe3+in the nonhem proteins. The fourth signal was found at the symmetric positions of the organic free radical, i.e, the second signal. Upon heating, the forth signals decreased monotonicaly. The ESR signal of the pepper heated for more than 10min was essentially the same as that before the irradiation. On the other hand, the second signal increased and then leveled off at a constant value by further heating. This is indicative the occurrence of some biochemical reactions such as Maillard reaction during heating procedures.
Radiation measurement with film badges is influenced by thermal energy and it is sometimes reported to be exposed to higher radiation by mistake under the condition with higher temperature. Because of no practical data regarding relationship between temperature and radiation dose, estimation of the true value under the condition with higher temperature was difficult. The current study was performed to clarify the influence of probable high-temperature on the radiation dosimetry by film badge system. Serial measurements of temperature in the car confirmed that it can rise to 80°C or higher in the area irradiated with sun beam. The setting time was ranged from 3h to 48h and the temperatures were monitored from 60°C to 110°C. Exposure dose was increased by the elevation of temperature. Significant correlation was confirmed between the temperature and the exposure dose measured by film badges. It was also confirmed that high temperature influenced the sensitivity of film badges.