Strontium radio

Strontium Titanate. Strontium titanate [12060-59-2], SrTiO, is a ceramic dielectric material that is insoluble in water and has a specific gravity of 4.81. It is made from strontium carbonate and is used in the form of 0.5-mm thick disks as electrical capacitors in television sets, radios, and computers. 

Comar, C.L. and Georgi, J. 1961 Assessment of ehronie exposure to radio-strontium hy urinary assay. Nature 191 390-391. 

There is bound to be one problem with resin glass polyalkenoate cement. Because the matrix is a mixture of hydrogel salt and polymer, lightscattering is bound to be greater than in the conventional material. Moreover, the zinc oxide-containing glass of class II materials is bound to be opaque. This makes it difficult to formulate a translucent material and is the reason why their use is restricted to that of a liner or base. However, the class II material cited will be radio-opaque because it uses strontium and zinc, rather than calcium, in the glass. 

This useful technique has made many contributions to radio- and nuclear chemistry, although primarily for investigational purposes rather than those of separation for its own ends. Thode and his co-workers have made many investigations into the inert gases produced in fission and it was by these means that the fine structure of fission was first discovered (79), (121). Since then several other elements, the rare-earths, strontium, caesium, zirconium, and molybdenum (35), (50), (132) have been investigated, and the isotopic ratios obtained provide relative values of fission-yields which are more accurate than can be obtained by standard radiochemical means. The latter technique, however, requires rather less heavily irradiated material than the former. 

Radio-strontium tested as treatment for bone cancer, Sc. News Letter, 40,... 

Barium and strontium azides are used in the manufacture of valves in radio technology. 

If the sample contained large quantities of radio-cesium, radio-strontium, and radio-silver would this have an effect on determining 131I in the final product Discuss. 

Vegetation Sample Preparation for Radiochemical Analysis of Radio-strontium... 

This laboratory experiment describes the preparation of a vegetation sample (e.g., grass) for radiochemical analysis. The sample is dried and ashed. In Part 12A, the ash is fused with sodium hydroxide and sodium carbonate to bring it into solution. An alternative method in Part 12B uses a microwave-assisted digestion technique with nitric and hydrofluoric acid. The prepared sample is suitable for radionuclide analysis, notably for radio-strontium or plutonium. 

Step 8. Mix the dissolved sample. Measure its volume and record it. Relate the initial dried sample weight to this volume. Close the bottle, label its content, and save the solution for the determination of radio-strontium (Experiment 13). 

Determination of Radio-strontium Isotopes in Environmental Samples... 

To determine radio-strontium isotopes in ash or water samples by conventional radiochemical separation method and counting beta particles. 

The two fission-produced radio-strontium isotopes of interest in environmental samples are 90Sr and 89Sr. Sr-90 has a fission yield of 5.8 %, a half-life is 28.78 a, and the radioactive daughter 90Y with a half life of 2.67 d, to which it decays by beta-particle emission. Sr-89 has a fission yield of 4.7%, a half life of 50.52 d, and decays to the stable daughter89 Y. The decay schemes given in Figure 13.1 show that these two radio-strontium isotopes for practical purposes can only be measured by beta-particle counting. 

R2 = net count rate in c/s after lengthy interval (typically, about, 18 days) Rj = net count rate in c/s promptly after strontium separation A = activity of radio-strontium in Bq at time of measurement D2 = ingrowth fraction of90Y after lengthy interval (0.996 after 21 days) ... 

You are told that a sample contains 1-week-old fission products in addition to the suspected radio-strontium isotopes. How would you modify the above procedure to respond to the presence of an excess amount of 140Ba and rare earth fission products Also, what other radiostrontium isotopes will be present, how does this presence affect the measurements, and what modifications are needed in the counting protocol Be specific. 

Determination of Radio-strontium in Water with a Strontium-specific Solid-phase Extraction Column... 

To determine 90Sr with solid-phase extraction (SPE) column that is specific for the separation of radio-strontium. 

Di-(2-Athylhexyl)phosphorsaure eignet sich flit die selektive Ab-trennung des Strontiums von Calcium und wurde sowohl in det radio-chemischen Analyse (76) als auch im technischen MaBstab hierzu ver-wendet (359). Die Ttennung des Silbers von Blei gelingt dutch Extraktion als Tributylammonium-silberrhodanid (632), wahrend Eisen als Tri-n-butylammonium-hexarhodanoferrat(III) (625) von Aluminium entfemt wird. 

After fission of uranium 235, the radionuchdes produced in the spent fuel have cesium, strontium, iodine, and other radionuclides of very long half-lives that can be a danger. The other radio wastes include contaminated filters, wiping rags, solvents, protective clothes, hand tools, instruments and instrument parts, vials, needles, test tubes, and animal carcasses. Precautionary and preventive measures include ... 

Use Radiation source in industrial thickness gauges, elimination of static charge, treatment of eye diseases, in radio-autography to determine the uniformity of material distribution, in electronics for studying strontium oxide in vacuum tubes, activation of phosphors, source of ionizing radiation in luminous paint, cigarette density control, measuring silk density, atomic batteries, etc. 

It should be noted that radioactive contaminants are not to be compared with their stable chemical counterparts. For example, because of the unchangeable character of the nuclear disintegration phenomenon, the natural purification processes which restore chemical and biological balances in the environments of living" things, would have no effect on the radio-toxic properties of the radioactive elements. The time required for accumulations of strontium-90 to decay to background levels, would... 

Ben-Josef E, Lucas DR, Vasan S, et al. 1995a. Selective accumulation of strontium-89 metastatic deposits in bone Radio-histological correlation. Nucl Med Commun 16 457-463. 

Finkel MP. 1947. The transmission of radio-strontium and plutonium from mother to offspring in laboratory animals. 20 405-421. 

Watanabe N, Yokoyama K, Kinuya S, et al. 1998. Radio toxicity after strontium-89 therapy for bone metastases using the micronucleus assay. J Nucl Med 39 2077-2079. 

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