 |
| RSH > Documents > RSH Data Doc > 1.3 [Rev 2] |
|
RSH Data & Documents "Low Level Revision 2 1.3
|
Drs. P.
Balaram, and K. S. Mani of the Regional Cancer Centre, Kerala, India state (1994) that:
"The protozoas and paramecia when exposed
to background chronic gamma-irradiation respond by proliferation while
shielding of these organisms by lead reduced this effect. A chronic two-month irradiation
of rats with 7 cGy/y resulted in an increase in the splenic and thymic lymphocyte
populations... Increased survival rates have also been noticed in mice exposed to low doses (2.5-15 cGy)
of X-irradiation prior to a second exposure at a sublethal dose. Faroqi and Kesavan observed that mice pretreated with 0.25 Gy and 0.05 Gy were better protected against
chromosomal damage when challenged with a dose of 1 Gy of x-rays." Drs. G. Sacher and E. Trucco, of Argonne National Laboratory, discuss improved performance and survival produced by radiation (1962):"Lorenz and co-workers found an increased after-survival of mice that had been exposed throughout adult life to 0.11 r of gamma rays daily. The increase was small and hardly significant, but they confirmed it in a subsequent test. Carlson and co-workers found significantly increased after-survival in two independent experiments on rats exposed to about 1 r daily throughout adult life. It was observed by Sacher and Grahn (1961) that in three different strains of mice there was no reduction in mean after-survival at daily doses of 5 r/day. Since 5 r/day results in an accumulated dose of about 2500 r, which is expected to produce in excess of 20% life shortening, these instances of survival significantly in excess of expectation must be considered to be cognate to the previous instances of increased mean after-survival. ...Increased life expectation has also been found in insects exposed to x or gamma rays daily throughout adult life. The exposure levels required for this effect in insects are on the order of hundreds or thousands of roentgens per day." |
RSH > Documents > RSH Data Doc > 1.3 [Rev 2
|
For more information please contact the RSH President Jim Muckerheide
For website problems please contact the Webmaster |