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[en] The neutron induced cross sections are calculated on Ir- 191 and Ir-193 from 10 keV up to 20 MeV, on (n, tot), (n, n), (n, n'), (n, γ), (n, p), (n, α), (n, 2n), (n, 3n), (n, np) and (n, nα) reactions. Iridium emits intense gamma rays. Specially, Ir-192 is the major gamma ray source material and widely used in the several areas: material assay, nondestructive testing and medical treatment. For the purpose of the above utilization, Ir-192 is mainly produced in the isotopic production nuclear reactor by the neutron capture process from Ir-191. Using threshold reaction with high energy of neutron, Ir-192 can be produced from Ir-194 by the process of the neutron capture and decay as well. Ir- 191 and Ir-193 have 37.3 % and 62.7 % respectively in the natural abundance. Ir-191 and 193 are stable isotopes. Ir-192 has 73.8 days half-life at ground state and 1.45 months at 56.7 keV meta stable state. Ir-192 has the beta decay to produce Pt-192 and the electron capture to produce Os-192. The major emitted gamma rays are 604 keV, 316 keV and 468 keV from the ground state decay. ENDF/B-VI has fairly recent evaluation on Ir-191 and Ir-193, evaluated in 1995 and distributed in 1997 (by R.Q.Wright, ORNL). From 2 to 20 MeV, the capture data was obtained by renormalizing the natural iridium capture to the Macklin data of Ir-191 at 2 MeV energy. ENDF/B-VI has the (n, 2n), (n, 3n), (n, p) and (n, a) cross section data unchanged from the BROND natural iridium evaluation. The evaluations consisted of an optical model potential search followed by a complete nuclear reaction model calculation and a validation for the experimental data. Nuclear reaction cross sections were calculated using the recently released Empire-II code. The direct capture model enhances the capture cross section in the preequilibrium energy region, and the width fluctuation correction influences on the capture and inelastic scattering cross sections in the equilibrium energy region. The calculated cross sections are graphically compared with the experimental data and the evaluated files (ENDF/B-VI and BROND-2). The evaluated results are compiled in an ENDF-6 format and finally, they will be merged with the resonance results to make the full data file

[en] The author describes a new method of treatment combining biliary drainage with radiation using in iridium 192 wire used in patients presenting obstructive jaundice due to cholangiocarcinoma involving hepatic duct at the hilum of the liver, 25 patients have been treated. The one year survival is 48% of patients. This treatment is a reasonable palliation in these patients in whom curative therapy is not possible

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[en] Recent experimental data, including detailed studies of the ¹⁹¹Ir and ¹⁹³Ir metastable states have significantly improved our understanding of the nuclear structure for many iridium isotopes. Combining experimental γ production cross sections with the results of the reaction theory code GNASH, improved evaluations of neutron induced cross sections on several iridium isotopes have been completed. With a focus on improved descriptions of nuclear structure and pre-equilibrium modeling, ¹⁹¹Ir(n,xn) cross sections are presented. (authors)

[en] A level diagram of states and transitions observed by Coulomb excitation of ¹⁹¹Ir with 160-MeV ⁴⁰Ar ions is given. The experimental γ-ray yields are compared with the predictions of the particle-asymmetric-rigid-rotor model for transitions within the rotational-like band based on the 3/2⁺ ground state of ¹⁹¹Ir. Also, the experimental and calculated results are compared for the transitions from the decay of the Ki Ji/sup π/ = 7/2, 7/2⁺ state at 686.3 keV in ¹⁹¹Ir

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