hrvatski

Periodičnosti u okolišnoj radioaktivnosti u Zagrebu u razdoblju 1985-2011.

Continuous measurements of the environmental dose rate D at the Institute for medical research and occupational health in Zagreb have resulted in a database containing daily values of D between October 23, 1985, and December 31, 2011. Apart from the appreciable increase in the time of the Chernobyl accident, D was always constant and amounted to 30-35 pGy/s. Fourier transform of D as a function of time reveals a number of discernible periodicities hidden in the noise. The corresponding periods are 6 months (m), 9.3 m, 12 m, 13.7 m, 15.7 m, 20 m, 31 m, and 39 m. Two of the periods (6 m and 12 m) can be explained by seasonal atmospheric effects, whereas the other periods agree well with periods in solar activity. This can be linked to the nucleosynthesis of 7Be in the atmosphere under the influence of cosmic rays.

brzina doze; periodično ponašanje; 7Be

nije evidentirano