Tritide titanium

Temperatures, Injector, 250°C column, 190°C manifold, 200°C detector, 190°C Detector, titanium tritide operated in the pulse mode at 50V amplitude, l-/usec pulse width, and 100-/usec pulse interval... 

The most common sources are based on the 3H(d, n) reaction. Deuterons are accelerated to 150 keV with currents 2.5 mA and strike a tritium target. They produce 2 x 1011 of 14-MeV neutrons/s under these conditions. The neutrons produced are widely used in fast neutron activation analysis for the determination of light elements. The tritium targets are typically metals such as Ti, which have been loaded with titanium tritide. The accelerators are usually small Cockcroft-Walton machines or small sealed-tube devices where the ion source and accelerator structure are combined to produce a less expensive device with neutron yields 108/s. 

The LDR for the older systems is only about 50, unless a linearizer is used. A modem detector has an LDR of about 1 O. The carrier gas is nitrogen or helium, which must be pure and diy. With packed columns, the detector is sensitive to column temperature changes and, therefore, is difficult to use with temperature programming. However, temperature programming can be done with capillary columns. The P-particle (electron) source for older instmments is 250 mC of tritium as titanium tritide, and this limits the detector temperature to 220 °C. Note A (f particle is the same as an electron, except that it originatedfrom the decay of an atom. 

In their work Barrel1 and Ballinger examined two types of electron affinity detectors. The first was of the parallel plate type equipped with a 100 me titanium tritide source, mounted on a Jarrell-Ash Universal 700 gas chromatograph and the second which was of the cylindrical type consisting of a cylindrical 250 me titanium source cathode and a tubular inlet port anode obtained from Wilkins Instrument and Research Corporation. The latter detector required several modifications to obtain adequate response and stability. The most important modification consisted of a heater (Figure 141) to the detector chamber. The electron affinity detector, while not directly sensitive to aliphatic hydrocarbons, can be blocked and rendered totally insensitive by condensation of a heavy and relatively nonvolatile hydrocarbon film on the ionization source. A heater placed around the detector and maintained at a constant temperature of 150 to 180 0 is necessary for the long term stability of this detector. 

For the detection of the optical absorption of excess electrons in liquid helium, eight interchangeable IR semiconductor lasers immersed in the liquid were employed. A schematic of the setup is shown in Figure 25. Excess electrons were injected into the liquid from a metal cathode on which a titanium tritide P-source was deposited. Concentrations of 10 cm could be produced. The change in laser light intensity was measured by a boron-doped silicon photoresistor. 

Pressure-composition-temperature and thermodynamic relationships of of the titanium-molybdenum-hydrogen (deuterium) system are reported. 0-TiMo exhibits Sieverts Law behavior only in the very dilute region, with deviations toward decreased solubility thereafter. Data indicate that the presence of Mo in the 0-Ti lattice inhibits hydrogen solubility. This trend may stem from two factors for Mo contents >50 atom %, an electronic factor dominates whereas at lower Mo contents, behavior is controlled by the decrease in lattice parameter with increasing Mo content. Evidence suggests that Mo atoms block adjacent interstitial sites for hydrogen occupation. Thermodynamic data for deuterium absorption indicate that for temperatures below 297°C an inverse isotope effect is exhibited, in that the deuteride is more stable than the hydride. There is evidence for similar behavior in the tritide. 

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