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Bartlett, D.*; Dietze, G.*; Hertel, N.*; Bordy, J.-M.*; Endo, Akira; Gualdrini, G.*; Pelliccioni, M.*; Ambrosi, P.*; Siebert, B.*; Veinot, K.*; et al.
no journal, ,
The ICRU operational quantities for area and personal monitoring have been in use for more than 20 years and are currently under review by an ICRU committee. Special attention has been given to inconsistencies in the application of these quantities and the relationship of the existing operational quantities to the newly released ICRP116 conversion coefficients for equivalent dose and effective dose. Previously reference values of these quantities were computed using the kerma approximation for photons and neutrons incident on the ICRU phantom. The kerma approximation is not applicable when the range of secondary charged particles in the phantom is greater than the depth at which the absorbed dose is being computed. Various options in the definitions of the operational quantities and their application are being considered. The current status of the report will be presented in light of the special consideration that is required to minimize the impact on radiation monitoring practice.
Umezawa, Katsuhiro*; Kato, Mitsugu; Tanabe, Tsutomu; Wada, Takao
no journal, ,
We are working on the development of new mobile water monitoring equipment, resulting in a novel all-in-one package - the "Water Monitoring Car". This monitoring car is now in production and scheduled for completion in March, 2014. It is designed for in-situ 
-ray spectrometry for 
Cs and 
Cs quantification in water in Fukushima, Japan. This is especially important for areas where it is difficult to take out samples but radioactivity measurements in water in different environments are required for returning residents. Such environments include storage reservoirs for farming and sources of drinking water to houses from mountain runoff. The equipment now used incorporates a Ge semiconductor detector with a spiral-shaped tube molded around it. Water is pumped from the source of interest via hoses, passed through this tube and then discharged. Incorporated lead shielding around the tube has a thickness of 10 cm. Such optimized shielding and the higher resolution of the Ge detector are expected to result in both a lower MDA and higher accuracy at low radiocesium concentrations.