Strontium Nitrate Solutions Research Articles

放射性廃水蒸発濃縮処理装置の除染係数

A study was made to determine the decontamination efficiency of a radiochemical waste evaporator system, which consisted of evaporator, cyclone, mist-separator and condenser. The system was designed to handle the liquid radioaetive waste, which ranged in activity from 10/sup 4/ 10/sup -2/ mu c/ml, at the nate of 200 1/hr and to get a volume reduction ratio of 100 ~ 200. The evaporator is single effect and vertical shell-and-tube type, and is operated for non-foaming liquid by fixing the liquid level above the upper tube sheet of the calandria. For foaming liquid, however, the evaporator is operated by lowering the liquid level below the middle of the calandria. In the latter case, the upper part of the tubes above the liquid surface serves as a foam breaker. The decontamination factors of the evaporator, cyclone, and mist-separator and the over-all decontamination factor were measured for the boil-up rates varying from 50 to 300 1/hr. Lithium chloride and strontium nitrate solutions were used as test liquid. The decontamination characteristic of the evaporator is different for the two test liquids and depends on the liquid level. The over-all decontamination factor was measured to be 10/sup 6/ ~ 10/sup 8/ and it was revealedmore » that the required decontamination efficiency was achieved. Discussion is given on the mechanism of the generation of liquid entrainment. (auth)« less

Band Spectra Emitted by Strontium and Barium in Arcs and Flames

Studies have been made of the spectra given by strontium and barium in an oxy-hydrogen flame, in a `vacuum arc' in water vapour, in a `vacuum arc' in heavy-water vapour (D2O), and in an arc in air at atmospheric pressure. For strontium, a band with some structure at 6050 A and diffuse bands with maxima at 6460, 6590, 6675 and 6820 A are attributed to SrOH, in agreement with James and Sugden's suggestion, the assignment being supported by small isotopic displacements with SrOD. Bands at 5950, 6050 and the far red, obtained best in the arc at 1 atmosphere, have a very complex structure suggesting a polyatomic emitter and variation of strength with concentration when strontium nitrate solution is sprayed into a flame supports assignment to the dimer of the oxide, Sr2O2. For barium, bands in the green and photographic infra-red are attributed to BaOH, the assignment again being supported by the isotopic shift. Diffuse complex bands near 4800, 5020 and 5500 A in the arc in air may be due to the corresponding oxide dimer, Ba2O2.