Both tendencies contribute to a higher
absorbed dose.
Through RSM analysis, it was observed that 12.69 kGy
absorbed dose and 4.65% H2O2 were found better for maximum degradation of contaminants.
Without knowledge of the rate of radiobiological clearance as well as the degree of intra-lesion variability in
absorbed dose, a proportion of patients will be over- or under-treated using an empiric dose of I-131.
At an
absorbed dose of 300 kGy about 25 radicals are generated on the high molecular mass PP.
Mutation frequency M(x,y) and mutation yield Y(x,y) were calculated as: M(x,y) = Nm / Ns; Y(x,y) = Nm / No, where Nm is the number of mutants per mL, No is the number of treated cells per mL, x the
absorbed dose, and y the dose of modulators (16, 19, 20).
Where IA is the change in absorbance at I>>max, b is the optical path length (cm), Iu is the molar extinction coefficient at I>>max (L mol-1 cm-1), I is the density of the dosimeter (g.cm-3) and D is the
absorbed dose (Gy).
We propose that CT manufacturers should consider to regulate their dose reports to include [bar.SSDE] information, since it offers more realistic results than CTD[I.sub.vol] based on the
absorbed dose. In the absence of [bar.SSDE] information, SSD[E.sub.center] could be a reasonable and easily applicable method in clinical practice.
Comparison between remnant and red-marrow
absorbed dose in thyroid cancer patients submitted to 131I ablative therapy after rh-TSH stimulation versus hypothyroidism induced by L-thyroxine withdrawal.
The gantry angle, measured
absorbed dose (Gy) and % deviation for twelve beams with six inhomogeneous inserts with field size of 22 cm x 25 cm at 0[degrees] was 1.0004, 22.5[degrees] was 0.9981, 45[degrees] was 0.9974, 90[degrees] was 1.0034, 135[degrees] was 0.976, 157.5[degrees] was 1.0082, 180[degrees] was 0.9693, 197.5[degrees] was 0.9722, 215[degrees] was 0.9820, 270[degrees] was 0.9661, 315[degrees] was 0.9708 and 337.5[degrees] was 0.9799 Gy respectively and corresponding % deviation was 0.04, 0.19, 0.26, 0.34, 2.40, 0.82, 3.07, 2.78, 1.80, 3.39, 2.92, and 2.01, respectively [Table 3].{Table 3}
Keywords:
Absorbed dose, Cobalt-60, Gamma radiations, Phantoms, Ion chamber.
Based on the information of the residents using the stream water and the results of paraquat concentrations, dermal
absorbed dose (DAD) value was done after which the hazard quotient (HQ) was calculated.