Experiment on the Treatment of Waste Extraction Solvent From the Molybdenum-99 Process

2013 ◽  
Author(s):  
Hsien-Ming Hsiao ◽  
Chang-Liang Hu ◽  
Kuang-Li Chien ◽  
Wen-Chen Lee ◽  
Tsong-Yang Wei
Keyword(s):  
Organic Solvent ◽  
Alkaline Solution ◽  
Removal Rate ◽  
Solution Concentration ◽  
Gross Alpha ◽  
Extraction Solvent ◽  
Third Phase ◽  
Extraction Test ◽  
Naoh Solution ◽  
Gross Alpha And Beta

In the Mo-99 (Molybdenum-99) isotope extraction test process for radiopharmaceutical applications, organic solvent is used to extract Mo-99 from an irradiated UO2 dissolution. The extraction solvent was stored when the test work was stopped. A total of about 120 liters of waste solvent was stored at INER (Institute of Nuclear Energy Research, Taiwan). The extraction solvent consisted of 5% di-(2-ethylhexyl)-phosphoric acid (D2EHPA) and kerosene. The radionuclides found in the waste solvent include Cs-137, Am-241, Tc-99, and Sr-90, which give off gross alpha and beta radioactivity of 1898 and 471 Bq/ml, respectively. This study aims to remove radionuclides from the waste solvent using sodium carbonate and sodium hydroxide solutions in different concentrations. After mixing the waste solvent with the alkaline solution followed by settling, a third phase other than organic and aqueous phase appeared which is expected due to the saponification reaction. The experimental results showed that increasing the number of washing and the alkaline solution concentration could enhance the radionuclides removal rate. An optimal removal method was proposed using 2M Na2CO3 solution twice followed by 1M NaOH solution one time for the third phase generated early in the mixing stages. The remaining gross alpha and beta radioactivity of the treated organic solvent was 2 and 3 Bq/ml, respectively. The treated solvent could be stabilized by ashing at 500°C and then immobilized. The alkaline solution would be neutralized by hydrochloric or nitric acid and then treated using a variety of adsorbents or bone char via adsorption to remove nuclides to meet the wastewater discharge limitation.

scholarly journals Photoluminescence as a Complementary Tool for UV-VIS Spectroscopy to Highlight the Photodegradation of Drugs: A Case Study on Melatonin

Molecules ◽  
2020 ◽  
Vol 25 (17) ◽  
pp. 3820
Author(s):  
Monica Daescu ◽  
N’ghaya Toulbe ◽  
Mihaela Baibarac ◽  
Alin Mogos ◽  
Adam Lőrinczi ◽  
...  
Keyword(s):  
Alkaline Solution ◽  
Uv Light ◽  
Chemical Compounds ◽  
Solution Concentration ◽  
Isosbestic Point ◽  
Photoluminescence Excitation ◽  
Vis Spectroscopy ◽  
Naoh Solution ◽  
Drug Solution

In this work, a complementary ultraviolet-visible (UV-VIS) spectroscopy and photoluminescence (PL) study on melatonin (MEL) hydrolysis in the presence of alkaline aqueous solutions and the photodegradation of MEL is reported. The UV-VIS spectrum of MEL is characterized by an absorption band with a peak at 278 nm. This peak shifts to 272 nm simultaneously with an increase in the band absorbance at 329 nm in the presence of an NaOH solution. The isosbestic point localized at 308 nm indicates the generation of some chemical compounds in addition to MEL and NaOH. The MEL PL spectrum is characterized by a band at 365 nm. There is a gradual decrease in the MEL PL intensity as the alkaline solution concentration added at the drug solution is increased. In the case of the MEL samples interacting with an alkaline solution, a new photoluminescence excitation (PLE) band at 335 nm appears when the exposure time to UV light reaches 310 min. A down-shift in the MEL PLE band, from 321 to 311 nm, as a consequence of the presence of excipients, is also shown. These changes are explained in reference to the MEL hydrolytic products.

Seasonally gross alpha and beta activity concentration in bottom and mid-depth water in Sır Dam Pond (Kahramanmaras, Turkey)

Kerntechnik ◽  
2019 ◽  
Vol 84 (3) ◽  
pp. 194-199
Author(s):  
H. Çam ◽  
A. Küçükönder ◽  
B. G. Durdu ◽  
M. Doğru ◽  
S. Karatepe
Keyword(s):  
Activity Concentration ◽  
Beta Activity ◽  
Gross Alpha ◽  
Gross Alpha And Beta ◽  
Depth Water

Formability of Hydroxyapatite on Beta-Type Ti-Nb-Ta-Zr Alloy for Biomedical Applications through Alkaline Treatment Process

2007 ◽  
Vol 352 ◽  
pp. 297-300
Author(s):  
Toshikazu Akahori ◽  
Mitsuo Niinomi ◽  
Masaaki Nakai
Keyword(s):  
Alkaline Solution ◽  
Biomedical Applications ◽  
Treatment Process ◽  
Solution Treatment ◽  
Sodium Titanate ◽  
Alkaline Treatment ◽  
Simple Method ◽  
Metallic Biomaterials ◽  
Naoh Solution ◽  
Bioactive Surface Modification

Titanium and its alloys have been widely used as biomaterials for hard tissue replacements because of their excellent mechanical properties and biocompatibility. However, the bonding between their surfaces and bone is not enough after implantation. The bioactive surface modification such as a hydroxyapatite (HAp) coating on their surfaces has been investigated. Recently, a simple method for forming HAp layer on the surfaces of titanium and its alloys has been developed. This method is called as alkaline treatment process. In this method, HAp deposits on the surfaces of titanium and its alloys by dipping into simulated body fluid (SBF) after an alkaline solution treatment that is followed by a baking treatment (alkaline treatment). This process is applicable to newly developed beta-type Ti-29Nb-13Ta-4.6Zr alloy (TNTZ) for biomedical applications achieving bioactive HAp modification. In this study, the morphology of the HAp layer formed on the surface of TNTZ was investigated after various alkaline treatments followed by dipping in SBF. The formability of HAp on the surface of TNTZ was then discussed. The formability of HAp on TNTZ is much lower than that of commercially pure Ti, Ti-6Al-4V ELI and Ti-15Mo-5Zr-3Al alloys, which are representative metallic biomaterials. The formability of HAp on TNTZ is improved by increasing the amount of Na in the sodium titanate gels formed during an alkaline solution treatment where the NaOH concentrations and the dipping time are over 5 M and 172.8 ks, respectively. The formability of HAp on TNTZ is considerably improved by dipping in a 5 M NaOH solution for 172.8 ks. This condition for alkaline solution treatment process is the most suitable for TNTZ.

PRINCIPLES OF GROSS ALPHA AND BETA RADIOACTIVITY DETECTION IN WATER

2001 ◽  
Vol 81 (5) ◽  
pp. 567-574 ◽  
Author(s):  
Thomas M. Semkow ◽  
Pravin P. Parekh
Keyword(s):  
Gross Alpha ◽  
Gross Alpha And Beta

Preparation of Silicalite-1 Membranes on α-Al2O3 Tubes and its Concentration Performance of Low Ethanol/water Mixtures

2012 ◽  
Vol 608-609 ◽  
pp. 1337-1341
Author(s):  
Hong Liang Chen ◽  
Ji Song Yang ◽  
Yan Wang ◽  
Hui Ying Li ◽  
Xin Xin Li ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Solution Concentration ◽  
High Concentration ◽  
Separation Selectivity ◽  
Naoh Solution

Silicalite-1 membranes were successfully synthesized on α-Al2O3 tubes by in-situ hydrothermal synthesis after filling the tubes with water and glycerol mixtures, and all the membranes show high concentration performance towards ethanol/water mixtures after pretreating tubes with different NaOH solution. The results show that the flux enhances with the enhancement of NaOH solution concentration, but the separation selectivity decreases with the enhancement of NaOH solution concentration. After pretreating the α-Al2O3 tubes with different NaOH solution, the weight of all the α-Al2O3 tube decreases, but the Si/Al ratio increases, which shows that suitable pretreatment of α-Al2O3 is useful for improving the hydrophobicity of silicalite-1 membranes.

scholarly journals Measurement of Gross Alpha and Beta Activities in Mushroom Samples

2016 ◽  
Vol 37 (4) ◽  
pp. 325
Author(s):  
Mehmet Emin KORKMAZ ◽  
Osman AĞAR ◽  
Abdulah KAYA ◽  
Buğrahan EMSEN ◽  
Yasin UZUN
Keyword(s):  
Gross Alpha ◽  
Gross Alpha And Beta
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