Unknown Propenylbenzene 1 -Methyl-2-ethylbenzene Propenylbenzene Comment z = -2 z = -2 z = -2 z = o z = o z = -4 z = -4 m / e 96, Z = -2 z = o z = -4 z = -4 z = -2 z = -4 z = f 2 z = -2 , z = -4 z = -4 z = -4 z = -2 z = -2 z = -2 m / e 110, Z = -2 z = o m / e 104 z = o z = o z = o z = o m / e 118 m / e 120 z = -2 m / e 120 m / e 120 z = -4 m / e 118 m,/e 120 m / e 118

An apparatus for continuously de-termining trace concentrations of acidic or basic components of a gas stream is described. The analysis is carried out by scrubbing the gas; stream with an aqueous salt solution and titrating the dissolved species witn electrolytically generated hydronium or hydroxide

Experience with monitoring mixed radiation fields in nuclear reactors is described. Dose rates were measured by the radiation-produced heat in simple calorimeters constructed for this purpose. Principles of construction are reviewed for two types of instruments. Accuracies of about 10 per cent are estimated. One type of calorimeter measured the total reactor radiation. This device embodied a graphite radiation absorber suspended within a hollow cylinder. Heat flowed radially to the wall of the cylinder. Four units of this type were operated in the Materials Testing Reactor. The other type of instrument measured only the gamma portion of the reactor radiation. Neutron sensitivity was minimized by using lead as the absorber. Heat flowed axially along the lead rod to a heat sink. Three versions were built in evolving the final model which was used to determine gamma heat in the Brookhaven graphite reactor.

No abstract

In the study of X-ray absorption fine structure, one is faced with the task of measuring sample absorbance over an extended wavelength region. For the sake of accuracy, these measurements are often carried out on a fixed-count basis. Manual collection of the data at a hundred or more spectrometer settings is a tedious and time-consuming chore. This paper describes an automated system for accumulating absorption data.The equipment is used in conjunction with a Philips wide-range goniometer employed as a single-crystal spectrometer. It consists of: (1) a four-position sample changer, (2) a fixed-count selector for each sample position, (3) a five-digit counter and paper tape printer which register and record sample identification and counting times based on a 60-cps clock frequency, and (4) a programmer. The spectrometer advance is accomplished using the Philips step-scan arrangement. An IBM 7094 FORTRAN program for data reduction and computation will be described. The possibility of using X-ray absorption fine-structure measurements as a quantitative method for determining the various absorbing species will be discussed.