Carol J. Burns

Three new uranium species, (C₅Me₅)₂U(N-2,6-ⁱPr₂-C₆H₃)(S), (C₅Me₅)₂U(N-2,6-ⁱPr₂-C₆H₃)(η²-S₂), and (C₅Me₅)₂U(N-2,6-ⁱPr₂-C₆H₃)(SPMe₃) have been prepared.

Isomerisation of buta-1,2-diene to but-2-yne by (Me₅C₅)₂Yb is a thermodynamically favourable reaction, with the Δ_rG° estimated from experimental data at 298 K to be −3.0 kcal mol⁻¹.

This report is an overview of two main publications that provide a comprehensive review of the Los Alamos National Laboratory (LANL) Fission Basis. The first is the experimental paper, “Fission Product Data Measured at Los Alamos for Fission Spectrum and Thermal Neutrons on ²³⁹Pu, ²³⁵U, ²³⁸U,” [Selby, H. D., et al., Nucl. Data Sheets, Vol. 111 2010, pp. 2891–2922] and the second is the theoretical paper, “Fission Product Yields from Fission Spectrum n+²³⁹Pu for ENDF=B-VII.1,” [Chadwick, M. B., et al., Nucl. Data Sheets, Vol. 111, 2010, pp. 2923–2964].

This report is an overview of two main publications that provide a comprehensive review of the Los Alamos National Laboratory (LANL) Fission Basis. The first is the experimental paper, “Fission Product Data Measured at Los Alamos for Fission Spectrum and Thermal Neutrons on ²³⁹Pu, ²³⁵U, ²³⁸U,” [Selby, H. D., et al., Nucl. Data Sheets, Vol. 111 2010, pp. 2891–2922] and the second is the theoretical paper, “Fission Product Yields from Fission Spectrum n+²³⁹Pu for ENDF/B-VII.1,” [Chadwick, M. B., et al., Nucl. Data Sheets, Vol. 111, 2010, pp. 2923–2964].

Occupational studies typically observe a 20% deficit in overall mortality, broadly characterized as the healthy worker effect (HWE). Components of the HWE may be addressed by various analytical approaches. To explore the HWE in a modern industrial cohort. Standardized mortality ratios (SMRs) were calculated for 114,683 US chemical industry employees, who worked at least 3 days between 1960 and 2005. SMRs were 79 (95% confidence interval 78-80) for all causes, 81 (95% confidence interval 79-82) for heart disease, 70 (95% confidence interval 67-73) for non-malignant respiratory disease, 83 (95% confidence interval 81-85) for smoking-related cancers (buccal, cervix, oesophagus, stomach, pancreas, lung, larynx, bladder and kidney) combined and 97 (95% confidence interval 95-100) for other cancers. The low SMRs observed in this study are likely due to differential smoking between the cohort and the background population. Future considerations to control for the HWE should take this into account.

Objective: To evaluate the mortality for an occupational cohort and discuss its suitability as an internal comparison population. Methods: The study included 114,683 employees who worked at 1 of 25 US locations between January 1, 1960, and December 31, 2005. Standardized mortality ratios (SMRs) and 95% confidence intervals (CIs) were calculated based on US rates. Results: The SMRs were significantly favorable for all causes, malignant neoplasms, heart disease, and external causes. The most common cancer sites were lung in men (SMR = 83, 95% CI = 80 to 86), and breast in women (SMR = 94, 95% CI = 80 to 111). Conclusions: Overall, the mortality rates were favorable and robust. Discussed within are topics of historical concern at specific locations that may influence the cohort's appropriateness for future studies.