Comparison of the ICRP 30 models with the new models of ICRP 66 and 69 on the basis of the results of thorium incorporation monitoring of gas mantle manufactory workers by quarterly urinary bioassays

The worker in gas mantle manufacturing may be assumed to be subjected to the risk of chronic Thorium incorporation. The annual committed dose or intake, resp. may be determined from the mean intake rate determined from mean daily urinary excretion which should be derived from repeated samplings per year. The excretion data were interpretated using the excretion rates of 'Retex' computer code applying the ICRP 30 model. The results basing on the ICRP 66 respiratory tract model and the biokinetic model and data of the ICRP 69 were obtained from the computer code established in the Institute of Radiation Hygiene of the Federal Board of Radiation Protection. Assuming the more soluble classes the differences between effective dose equivalent and effective dose proved to be negligible with the exception of the results for one worker but in one year. Assuming class Y or S aerosols the differences may be vary by the factor of up to four. Comparing the results of both dose sizes throughout the classes substantially extensive differences were observed. (orig.)