The diminution of the neutron odd-even effect due to prompt neutron emission in low energy nuclear fission

Two fissioning systems [U-235(n(th), f) and Cf-252(sf)] have been studied to see the consequence of prompt neutron emission on odd-even effects. Monte Carlo calculations have been carried out for prompt neutron emission. Fragment and product yields have been analyzed by the Wahl Z(p), Model the Method of Differences and Model Independent Calculations. The result of the wash-out effect of prompt neutron emission on the neutron odd-even effect has been shown: however, this was not seen with the protons

Indoor radon concentrations and radon doses at three districts of Ankara, Turkey and raising public awareness on the issue

Indoor radon concentrations at METU, CIG-DEM and DOSTLAR in Ankara were measured using electrets. The statistical analysis of the data indicated a lognormal distribution of radon concentrations, with no significant difference between CIGDEM and DOSTLAR with geometric means of GM = 87.5 and 54.5 Bq m(-3), respectively. Radon concentrations did not change seasonally at CIGDEM which contain modern buildings, but at the slum district DOSTLAR, with poor insulation of houses a seasonal variation was observed. Annual effective radon doses were estimated (0.4-8.4 mSv). Public awareness about indoor radon was raised

Determination of pre-scission kinetic energy in low energy fission using Isotonic Charge Distribution Model

The parameters of Isotonic Charge Distribution Model have been calculated for several isotones of three law energy fissioning systems. The global charge even-add effects are determined as 0.27 +/- 0.04 for thermal neutron induced fission of U-233(U233T), 0.27 +/- 0.05 for U235T and 0.13 +/- 0.05 for PU239T. The pre-scission kinetic energies for U235T and PU239T are estimated and found to be similar to 16 MeV

Possible exit channel effect on isomer yield ratios

Isomer yield ratio measurements in fission are important in understanding the fission process. With the development of new instrumental techniques, a large number of yield data are now available. The experimental data on isomer yield ratios in the thermal neutron induced fission of U-235 compared with those calculated from the simple statistical model by MADLAND and ENGLAND. The method of calculation has been extended to the isotopes having more than one isomeric state. The results may be explained according to the multi-exit-channel model of fission