. Biophysical research methods. Biophysics -- Research. XVII. R A D I O A (• T I V E T U A C E R S 645 necessary are likely to differ and to ('hanfj;e as more experience is ob- tained. At the present time a national body, the National Commit- tee on Radiation Protection {68), and sectional bodies such as one rep- resenting the thirty Midwest institutions that co-operate with the Ar- oonne National Laboratory are drafting i-egulations on the safe han- dling of radioisotopes, including laboratory design {61). Since these regulations are not in a final state anything said now may become ob- solet
. Biophysical research methods. Biophysics -- Research. XVII. R A D I O A (• T I V E T U A C E R S 645 necessary are likely to differ and to ('hanfj;e as more experience is ob- tained. At the present time a national body, the National Commit- tee on Radiation Protection {68), and sectional bodies such as one rep- resenting the thirty Midwest institutions that co-operate with the Ar- oonne National Laboratory are drafting i-egulations on the safe han- dling of radioisotopes, including laboratory design {61). Since these regulations are not in a final state anything said now may become ob- solete. Eventually some such body of regulations will apply to any- one desiring to work in this field. The consideration that needs to be given to laboratory design is highly dependent upon the nature and ACTIVITY SCALE Slight Hazard Na"*, K", Cu^S Mnfi2*. As"*, As", Kr«5, H«i!"* Moderately Dangerous H3, P32, Na"*, SS5, CPe, Mn^^*, Fess*. Cosn*, SrS', Cd^s*, Ru'cs*, Rui»6, Te"', TeiM, Ii3i_ Cs'^'*, Ba'^o* Lai«*, Ce'", Pr'is, Nd'"*, An"'*, All'"*, Hc"'^'^*'' Very Dangerous C", Ca«, Fe65, Sr^o, Y^i, Zr's*, Ce'". 611", Bi'io. 10 100 fLC. mc mc. mc. curie ACTIVITV TO BE HANDLED IN LABORATORY I mc 10 mc. 100 mc. Fig. 15. Toxicity levels of selected radioisotopes {68). Effective radiotoxicity is obtained from a weighting of the following fac- tors : (a) half-life, {b) energy and character of radiations, (c) degree of selec- tive localization in the body, {d) rates of elimination, and (e) quantities in- volved and modes of handling in typical experiments. The slant boundaries between levels indicate borderline cases and emphasize that there is no sharp transition between the levels and the associated protection techniques. The principal 7-ray emitters are indicated by asterisks {, Na^^*). amount of the particular isotopeS to be handled, in addition to the type of work to be done. The amounts
Size: 1543px × 1619px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
