Review on the gross beta activity in rainwater observed throughout Japan in 1954

Tsujimura, Norio

Hoken Butsuri (Internet), 54(1), p.40 - 44, 2019/03

https://doi.org/10.5453/jhps.54.40

Rainwater containing radioactive materials originating from the USA's nuclear weapon test conducted at Bikini Atoll was observed throughout Japan in 1954. It has been reported that the maximum gross beta activity observed at that time in Kyoto was 523 pCi/mL (19,000 Bq/L). This measurement, however, focused on the gross beta activity contained in a small amount of rain sampled at the beginning of rainfall, which is different from present observations that are based on the average gross beta activity contained in rain collected during a 24-h period. As a result of reviewing and converting the 1954 data to be equivalent to current measurement, the maximum value was reduced to 50 pCi/mL (1,800 Bq/L), with a resultant surface deposition density of 310 mCi/km (11,000 MBq/km). These values are well below 1/10 of the past maximum observed a few days after China's fifth nuclear weapon test in 1966.

Sectional observation of marine water in Tokai coastal area

; ; ; Isozaki, Tokuju;

PNC TN8450 93-004, 144 Pages, 1993/06

PNC-TN8450-93-004.pdf:2.0MB

Generally speaking, two kinds of water plumes which have different temperature, salinity and so on are not easily mixturred and have special boundary. So, it is possible to predict ocurrence of special boundary of sea water from observation of temperature, salinity of sea water. Not only marine environmental monitoring such as radioactivity analysis of sea water, sea-bed sediment, marine products but also observation of water current, water direction, surface and ventical observation of water temperature, salinity and so on in Tokai coastal area are carried out with some observation instruments by Environmental Protection Section, Tokai Works, PNC. The results of vertical observation from 1990 to 1991 are recorded in this report.

Influence of natural radioactivities for monitoring of liquid effluent by a continuous monitor

; ; ;

Nihon Genshiryoku Gakkai-Shi, 10(12), p.684 - 685, 1968/00

https://doi.org/10.3327/jaesj.10.684

no abstracts in English

Lessons learned from unreasonable paper peer-review process seeking a comparison between Bikini H-bomb test and Fukushima Daiichi Nuclear Power Plant accident

Tsujimura, Norio

no journal, , 

no abstracts in English