A Radionuclide Generator of High-Purity Bi-213 for Instant Labeling

A new two-column 225Ac/213Bi generator was developed specifically for using 225Ac containing an impurity of long lived 227Ac. The parent 225Ac was retained on the first Actinide Resin column, while 213Bi was accumulated on the second column filled with AG MP-50 resin via continuous elution and decay of intermediate 221Fr. The 213Bi accumulation was realized in circulation mode which allowed a compact generator design. It was demonstrated that 213Bi could be quickly and effectively extracted from AG MP-50 in form of complexes with various chelating agents including DTPA and DOTA. The performance of the generator presented and a conventional single-column generator on the base of AG MP-50 was tested and both generators were loaded with 225Ac containing 227Ac impurity. The 213Bi generation efficiencies were comparable and greater than 70%, whereas the developed generator provided a deeper degree of purification of 213Bi from Ac isotopes and decay products of 227Ac.

Optimization of the Composition of Standards in Recognition and Compression Algorithms of Hyperspectral Images

The paper proposes a solution to the problem of minimizing the number of standards in order to increase both the compression coefficient of hyperspectral images (HSI) and the speed of correlation extreme compression methods (CEM). As modifications of the CEM, randomized and differential compression algorithms are offered. The randomized and difference algorithms are based on the hypothesis of spatial compactness of pixels located in local regions of the image matrix. This means that when a new template is formed based on an unrecognized pixel, there is a high probability of using a pixel that lies near the boundaries of the coverage areas of the existing templates, which leads to their increase. In order to reduce the influence of spatial compactness of pixels on the formation of standards, a methodology based on changing the sequence of recognized pixels is proposed. In a randomized algorithm, a row of the matrix is randomly determined for this, on the basis of which a sequence of recognized pixels is generated by a random column generator. In the difference algorithm of compression, the row number of the matrix is determined by the rule for finding the members of an arithmetic progression with a given difference. For the selected line a sequence of recognizable pixels is formed on the same principle. It should be noted that line-by-line pixel recognition in the self-learning mode allows compressing HSI of almost any volume. The effectiveness of the created algorithms is demonstrated on two fragments of real HSI. A comparative analysis of all three compression algorithms in terms of the quantitative composition of the obtained standards is presented.

Preparation and performance of 99Mo/99mTc chromatographic column generator based on zirconium molybdosilicate

Zirconium molybdosilicate (ZrMoSi) gel prepared using

MODIFIKASI,,99MO AUTOMATIC LOADING SYSTEM" GENERATOR 99MO/99MTC BERBASIS PZC

Proses pembuatan generator ~of9"'T c berbasis PZC pada dasarnya terdiri dari 4tahap yaitu penyerapan ~o pada PZC, pengisian komplek ~o-PZC ke dalamkolom, perakitan generator 99Mof9mTcdan pengelusian 99mTcdari kolom generator.Penelitian proses tersebut secara manual menghasilkan radionuklida 99mTcdenganmutu yang sarna dengan generator 99Mof9"'Tcdari hasil fisi. Hasil uji coba secarapre klinis dan klinis juga telah berhasil dilakukan melalui kerjasama dengan beberapaRumah Sakit di Indonesia. Sebagai pengembangan lebih lanjut ke arah tingkatproduksi, melalui kerjasama BATAN dan KAKEN Co. Jepang, telah berhasil dibuatprototipe Automatic loading system yang dapat melakukan tahap penyerapan ~opada PZC, pencucian kompleks serta pemindahan komplek ke kolom perakitansecara otomatis. Sistem ini mempunyai kelemahan sehingga perlu dilakukanbeberapa modifikasi terutarna pada sistem pencampuran 99Mo_PZC.Modifikasi padasub sistem pencampuran seperti pengisian ~o ke vial reaksi dan pengocokancampuran ~o-PZC telah berhasil dikerjakan dan berfungsi dengan baik, walaupunpengisian 20 mllarutan 99Moke vial reaksi perlu dilakukan 2 kali . Hasil modifikasipada sistem pengocokan menunjukkan bahwa sistem ini berjalan dengan baik.Kata Kunci : generator, PZC, 99Mo,99mTc,automatic loading systemAbstractProcess of generator 99Mof9"'Tc based on PZC basically consist of 4 phase that isabsorption of 99Moat PZC, loading 99Mo-PZCcomplex into column, assembling ofgenerator 99Mof9mTcand elution of 99mTcfrom column generator. The research of~rocess manually yielded 99mTcradionuclide with same quality with generator9Mof9mTc from fission product. Pre clinical and clinical tests have beensuccessfully done through cooperation with a few Hospital in Indonesia. Furtherdevelopment towards production rate, through cooperation BATAN and KAKEN Co.Japan, have successfully made the prototype automatic loading system available fordoing work of absorption of 99Moat PZC, washing of complex and also evacuationof complex to assembling column automatically. Existence of weakness from thissystem make require its some modifications especially at 99Mo-PZC mixing systems.Modification results at the filling system of 99Moto reacted vial and mixing systemof ~o-PZC have successfully done. For filling of 20 ml of 99Moreaction vial needto be done 2 times. Modification result at mixing system indicated that this systemrun better.Keywords: generator, PZC, ~o, 99mTc,automatic loading system133

Concept Development of an Oscillating Tidal Power Generator

The Engineering Business Ltd. (EBL) have developed a patented system for generating electricity from oscillating hydroplanes driven by flowing water. The concept started development with the award of a Smart Award from the UK governments Department of Trade and Industry (DTI) in 1998, which led to the development of the Active Water Column Generator (AWCG). The AWCG was a simple, sea / air interface device which demonstrated, through the actuation of hydroplanes in moving water, that power could be generated. However, this concept suffered from inherent size and vulnerability limitations. It was decided to alter the basic form such that it is now seabed mounted, and therefore protected from the worst storm and wave effects. This concept, known as Stingray, is being developed under the New and Renewable Energy Research and Development program run by the DTI. Following the successful conclusion of the first phase of work, a fast-track 15 week feasibility study undertaken in the last quarter of 2001, phase two of the program is well under way. This involves a full design study, for 2002/3, to design, install, operate, decommission and evaluate a 150kW demonstrator — the first of its kind internationally. This paper describes the progression from concept to demonstrator design, focussing on the modelling work undertaken in the initial investigation and plans for its subsequent validation. It outlines mathematical and physical modelling techniques used and then gives a brief summary of the findings to date.