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[en] This document presents the study that lead to the development of a method for direct iodine dosage by γ spectrometry. This method called differential attenuation dosage permits the dosage of solutions with concentrations in the range 100 μg.cm^-3 - 100 mg.cm^-3. In the medical field, several applications are to consider, for example the iodine dosage in vivo of the tyroid

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[en] Purpose: To study the influence of prostatic edema on postimplant physical and radiobiological parameters using ¹³¹Cs permanent prostate seed implants. Methods and Materials: Thirty-one patients with early prostate cancer who underwent ¹³¹Cs permanent seed implantation were evaluated. Dose-volume histograms were generated for each set of prostate volumes obtained at preimplantation and postimplantion days 0, 14, and 28 to compute quality indices (QIs) and fractional doses at level x (FD_x). A set of equations for QI, FD_x, and biologically effective doses at dose level D_x (BED_x) were defined to account for edema changes with time after implant. Results: There were statistically significant differences found between QIs of pre- and postimplant plans at day 0, except for the overdose index (ODI). QIs correlated with postimplant time, and FD_x was found to increase with increasing postimplant time. With the effect of edema, BED at different dose levels showed less improvement due to the short half-life of ¹³¹Cs, which delivers about 85% of the prescribed dose before the prostate reaches its original volume due to dissipation of edema. Conclusions: Results of the study show that QIs, FD_x, and BEDs at the level of D_x changed from preneedle plans to postimplant plans and have statistically significant differences (p < 0.05), except for the ODI (p = 0.106), which suggests that at the time of ¹³¹C seed implantation, the effect of edema must be accounted for when defining the seed positions, to avoid the possibility of poor dosimetric and radiobiologic results for ¹³¹Cs seed implants.

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[en] The decay of ¹³¹Ba (11.7 day) has been studied with Ge(Li) spectrometers and with a Ge(Li) γ-γ coincidence system. Twelve γ transitions and three levels in ¹³¹Cs at 919, 1170, and 1342 keV have been identified which were not reported previously. Upper limits are given for the γ-ray intensities of previously reported transitions at 323 and 508 keV which were not observed in this experiment. The Q value for the decay of ¹³¹Ba was determined from the (electron capture)/β⁺ intensity ratio to be 1372⁺¹⁰/sub -/₂₀ keV. This value agrees with the latest atomic mass evaluation, but disagrees with the only previous measurement by 207 keV. Our (electron capture)/β⁺ intensity ratio and the Q value deduced from a reaction study suggest that the (electron capture)/β⁺ ratio is not anomalous in contrast to some recent predictions. The ¹³¹Cs level structure and γ transition probabilities are compared to the result of an intermediate-coupling calculation