RESUMEN
To investigate the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident's radiological effect on marine ecosystem, ash samples of squids from the western Pacific Ocean were collected in May 2014 and measured using an underground gamma-ray spectrometer in the underground laboratory JinPing. Low levels of 108mAg, 110mAg, 134Cs and 137Cs were detected, which indicates that the influence of the FDNPP accident on marine ecosystem is lasting but decreasing.
Asunto(s)
Decapodiformes/química , Accidente Nuclear de Fukushima , Contaminantes Radiactivos/análisis , Animales , China , Ecosistema , Contaminación Radiactiva de Alimentos/análisis , Humanos , Océano Pacífico , Monitoreo de Radiación/métodos , Espectrometría gammaRESUMEN
A new method of pulse shape discrimination (PSD) for BEGe detectors is developed to suppress Compton-continuum by digital pulse shape analysis (PSA), which helps reduce the Compton background level in gamma ray spectrometry. A decision parameter related to the rise time of a pulse shape was presented. The method was verified by experiments using 60Co and 137Cs sources. The result indicated that the 60Co Peak to Compton ratio and the Cs-Peak to Co-Compton ratio could be improved by more than two and three times, respectively.
