ICRP60 TISSUE WEIGHTING FACTORS : HOW CALCULATED?

[Quintino De Notariis <qdenotariis@novacon.it>]

Recently Italian legislation adopted the criteria and terminology of ICRP60.

Could someone tell me how Tissue Weighting Factors WT in ICRP60 have been

calculated?

I mean, these factors in the old ICRP26 can be easily calculated from Risk

Factors per Sievert. For exemple, the Risk Factor fr Breast is 2.5E-3 and

the Total Risk Factor is 16.5E-3; so WT is :

                            2.5/16.5 = 0,15

The same way you can proceed with Red Bone Marrow, whose Risk Factor per

Sievert is 2.0E-3 :

                            2.0/16.5 = 0,12

I can't find a similar procedure for the new WT values in ICRP60.

I think we should use the values in Table 4, pag. 24 of the publication, but

there must be something else to consider that I don't know.

Could someone help me?



Quintino De Notariis

Health Physicist

Corso Vittorio Emanuele 45/E

86039 Termoli  



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