-transparent.png){kind=logo}
Ultrasoft X rays (approximately less than keV) provide a useful probe for the study of the physical parameters associated with the induction of biological lesions because the spatial scale of their energy depositions is of nanometer dimensions, comparable to that of critical structures within the cell. We report on cell-killing experiments using cultured hamster cells (V79) exposed to carbon K (0.28 keV), aluminum K (1.5 keV), copper K (8.0 keV), and 250 kVp X rays, under oxic and hypoxic conditions, and as a function of cell-cycle phase. Our principal results are: RBE increases with decreasing X-ray energy; OER decreases with decreasing X-ray energy; and cell-cycle response is similar for all X-ray energies. Our RBE results confirm earlier observations using ultrasoft X rays on mammalian cells. The shapes of fitted curves through the data for each energy are statistically indistinguishable from one another, implying that the enhanced effectiveness is purely dose modifying. The results reported herein generally support the view that single-track effects of radiation are predominantly due to very local energy depositions on the nanometer scale, which are principally responsible for observed radiobiological effects.
M R Raju, and
S G Carpenter, and
J J Chmielewski, and
M E Schillaci, and
M E Wilder, and
J P Freyer, and
N F Johnson, and
P L Schor, and
R J Sebring, and
D T Goodhead
April 1986,
International journal of radiation biology and related studies in physics, chemistry, and medicine,
M R Raju, and
S G Carpenter, and
J J Chmielewski, and
M E Schillaci, and
M E Wilder, and
J P Freyer, and
N F Johnson, and
P L Schor, and
R J Sebring, and
D T Goodhead
September 2010,
Mutation research,
M R Raju, and
S G Carpenter, and
J J Chmielewski, and
M E Schillaci, and
M E Wilder, and
J P Freyer, and
N F Johnson, and
P L Schor, and
R J Sebring, and
D T Goodhead
June 1977,
International journal of radiation biology and related studies in physics, chemistry, and medicine,
M R Raju, and
S G Carpenter, and
J J Chmielewski, and
M E Schillaci, and
M E Wilder, and
J P Freyer, and
N F Johnson, and
P L Schor, and
R J Sebring, and
D T Goodhead
March 1989,
Radiation research,
M R Raju, and
S G Carpenter, and
J J Chmielewski, and
M E Schillaci, and
M E Wilder, and
J P Freyer, and
N F Johnson, and
P L Schor, and
R J Sebring, and
D T Goodhead
March 2010,
International journal of radiation biology,
M R Raju, and
S G Carpenter, and
J J Chmielewski, and
M E Schillaci, and
M E Wilder, and
J P Freyer, and
N F Johnson, and
P L Schor, and
R J Sebring, and
D T Goodhead
October 1980,
International journal of radiation biology and related studies in physics, chemistry, and medicine,
M R Raju, and
S G Carpenter, and
J J Chmielewski, and
M E Schillaci, and
M E Wilder, and
J P Freyer, and
N F Johnson, and
P L Schor, and
R J Sebring, and
D T Goodhead
March 2001,
Radiation research,
M R Raju, and
S G Carpenter, and
J J Chmielewski, and
M E Schillaci, and
M E Wilder, and
J P Freyer, and
N F Johnson, and
P L Schor, and
R J Sebring, and
D T Goodhead
December 1987,
Physics in medicine and biology,
M R Raju, and
S G Carpenter, and
J J Chmielewski, and
M E Schillaci, and
M E Wilder, and
J P Freyer, and
N F Johnson, and
P L Schor, and
R J Sebring, and
D T Goodhead
January 1952,
Acta dermato-venereologica,
M R Raju, and
S G Carpenter, and
J J Chmielewski, and
M E Schillaci, and
M E Wilder, and
J P Freyer, and
N F Johnson, and
P L Schor, and
R J Sebring, and
D T Goodhead
October 1997,
Radiation research,
