mM fa A WwW those doses that you are showing on the board, when trans- FF I think it should be emphasized that lated into dose units, are just a couple of hundred milit- aw EISENBUD: grams. ony ~ with the controlled unexposed population, minute, CONARD: I was going to get around to that in a EISENBUD: Do CONARD: Sorry, I didn't mean to anticipate, Then another isotope that was found was 10 cobalt-60 to som extent, which is about 1/10 the single ll level. 12 haven't done-.- 13 14 15°) EISENBUD: CONARD: Any what? Have you looked for it? Not specifically, no; but we haven't had whole-body counts now in a couple of years. 16 17 18 We haven't seen any iron-55 in the people but we EISENBUD: You can't do it with whole-body counting. It decays by internal conversion and gives you an electron--CONARD: Maybe we'll pick it up in the urine. 19 EISENBUD: 20 in your laboratory. 21 and look at it with a thin crystal. 22 23 24 25 26 27 28 No. Yes, It should be very interesting in that group to see what the iron-55 level is. esting isotope, Maybe you have som What you do is separate out the iron-55 DONALDSON: EISENBUD: Sample blood. Iron-55 is an inter- It's been neglected up till now because the emission is a 6 Kev. electron which has a rank of ony one micron in tissue and it's teen generally ignored. goes to very small volumes of tissue. But iron Specifically it tends 29 to concentrate in these little globules and you get a very 30 high dose there because essentially all of the range of the 31 iron-55 electron is comparable with the diameter of the 32 globule, 33 Stafford Warren DOEJUCLA &2 MILLET: May I ask if the unexposed population