Reproductive factors

Marshall LM, Spiegelman D, Goldman MB, Manson JE, Colditz G, Barbieri RL, Stampfer MJ, Hunter DJ (1998) A prospective study of reproductive factors and oral contraceptive use in relation to the risk of uterine leiomyomata. Fertil Steril 70 432-439... 

Villard-Mackintosh and L., Vessey, M.P., Oral contraceptives and reproductive factors in multiple sclerosis incidence, Contraception, 47, 161, 1993. 

Karlson, E. W., Mandl, L. A., Hankinson, S. E., and Grodstein, E. (2004). Do breast-feeding and other reproductive factors influence future risk of rheumatoid arthritis Results from the nurses health study. Arthitis Rheum. 50,3458-3467. 

Gallagher RP, Elwood JM, Hill GB, Coldman AJ, Threlfall WJ, Spinelli JJ. Reproductive factors, oral contraceptives and risk of malignant melanoma Western Canada Melanoma Study. Br J Cancer 1985 52(6) 901-7. 

Stanford JL, Thomas DB. Reproductive factors in the etiology of hepatocellular carcinoma. The WHO Collaborative Study of Neoplasia and Steroid Contraceptives. Cancer Causes Control 1992 3(1) 37 2. 

Kelsey JL, Gammon MD, John EM. Reproductive factors and breast cancer. Epidemiol Rev 1993 15 36. 

The sketches and the general description of the erection of the pile were done by Mr. Young. Most of the calculations concerning the neutron reproduction factor were done by Mr. Weinberg, with the help of Messrs. Plass and Williamson. We drew also on the help of many other members of the group, and we had interesting discussions with Messrs. Creutz, Szilard, as well as with several members of Dr. Burton s group. 

This would be a rather unimportant reduction in the reproduction factor K unless the reproduction factor for a given system without considering any impurities, is very nearly unity. If on the other hand, the impurities in the uranium in the previous example had been Li Co ... 

The effect of impurities on the optimum reproduction factor K may be conveniently evaluated to a good approximation simply by means of certain constants known as danger coefficients which are assigned to the various... 

The size of the system will vary, depending upon the on the rate of neutron absorption by U and is also pro-K factor of the system, and upon other things. If the portional to the rate at which fissions occur in U . This reproduction factor K is greater than unity, the number 15 in tui n is controlled by the thermal neutron density exist-... 

A zinc coating of 5 mils in thickness may be used, but a 1 millimeter covering of aluminum is more resistant to corrosion. However, the 1 mm. aluminum covering reduces the reproduction factor K by approximately. 0055... 

During the operation of the neutronic reactor particularly at high neutron densities radioactive elements of exceedingly high capture cross section may be formed in the uranium as an intermediate element in the decay chains of fission fragments and this formation will lower the value cf the reproduction factor for the system. Radioactive xenon is an example of such an intermediate element, this product having a half life of about 9 hours and being formed mostly from radioactive iodine which has a half life of about 6.6 hours and decays to barium. There should be sufficient excess In the reproduction ratio of the reactor so that in the event the re-... 

FIG. 6 is a set of curves representing reproduction factor for various natural uranium to moderator ratios ... 

With larger bodies of uranium, the size and distribution of the uranium-bearing particles disposed in a moderator affect the value of the reproduction factor K because the 35 resonance loss (absorption by increases with de-... 

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