Production of Mg28 in the pile and cyclotron at Harwell

Mellish, C.E.; Crockford, Guy

doi:10.1016/0020-708x(57)90009-1

Cited by 11 publications

(3 citation statements)

References 4 publications

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“…Hollbach and Yaffe (497) have developed a process which recovers 99.8% of sodium-22 in high specific activity, and Perkins (922) reports a procedure for the separation of trace amounts of sodium-24 from reactor effluent water. Production of magnesium-28 both in a reactor and in a cyclotron is described (765,857). For reactor production, an alloy of magnesium and lithium enriched in lithium-6 is used, and the magnesium-28 produced by the (t, p) reaction.…”

Section: Separation and Preparation Op Radioisotopesmentioning

confidence: 99%

Nucleonics

Meinke¹

1958

Anal. Chem.

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Section: Separation and Preparation Op Radioisotopesmentioning

confidence: 99%

Nucleonics

Meinke¹

1958

Anal. Chem.

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“…Various radiochemical separations of 28 Mg from irradiated Li-Mg alloys are known. The separation procedures typically comprise (i) dissolution of the irradiated Li-Mg alloy, (ii) precipitation of some impurities with H 2 S [9,10], (iii) single or repeated precipitation of Mg(OH) 2 [9][10][11][12][13], (iv) dissolution of Mg(OH) 2 and removal of some contaminants with alumina and an anion exchange resin [11 -13] and finally (v) recovery of 28 Mg from the eluate by repeated evaporation to dryness [11,12], Although some of these steps have been omitted occasionally, the hitherto published separations are still rather complex and time-consuming.…”

Section: Introductionmentioning

confidence: 99%

Separation of ²⁸Mg from Reactor-Neutron Irradiated Li-Mg Alloy and Redetermination of its Half-life

Kolář¹,

Velden²,

Vollinga³

et al. 1991

Radiochimica Acta

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Li-Mg alloy target / Reactor-neutron irradiation / 28 Mg / Radiochemical separation / Polyantimonic acid/ 28 Mg half-life Summary A novel method for the radiochemical separation of 28 Mg from reactor-neutron irradiated Li-Mg alloy was developed. It is based on the use of the inorganic ion-exchanger, polyantimonic acid, as a removing agent for both 24 Na and "Mn. The final preparations were free of all y-rays emitting contaminants but containing some tritium. The redetermination of the half-life of 28 Mg resulted in 20.915 + 0.009 hour.

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“…Neutron irradiation of LiMg alloys in a nuclear reactor can produce some tens to hundreds of pCi's by way of the sequential processes 6Li(n,a)t/26Mg(t,p)2gMg, but the final product is of low specific activity (3). A routine procedure for a no-carrier-added product of high specific activity uses a 150 MeV a particle beam for the reaction 27Al(01,3p)~8Mg yielding batches of a few mCi after 6 hours of bombardment (8).…”

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confidence: 99%

Photonuclear production of ²⁸MG(→²⁸AL)

Polak

Wijand

Lindner

1989

Labelled Comp Radiopharmac

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The radionuclide 28Mg ( t 1~ = 20.9 h) decays by p-, yemissions (E 0.46 MeV, E+ = 0.031 i95 %), 0.400 (36 %), 0.942 (36 %), 1.342 (54 %) MeV) to the shor&lGed radioactive daughter Next to 7Mg (t1/2 = 9.9 min), 2*Mg is ?he longest-lived radionuclide of magnesium and therefore of considerable interest as a tracer, notably for physiological investigations (1,2). However, wide-spread application has been hampered by its restricted availability. This is because of difficulties encountered in its production due primarily to 28Mg being neutron-rich and fairly far from the line of p-stability.For its production both neutron and charged particle induced reactions (5-9) have been tested. Neutron irradiation of LiMg alloys in a nuclear reactor can produce some tens to hundreds of pCi's by way of the sequential processes 6Li(n,a)t/26Mg(t,p)2gMg, but the final product is of low specific activity (3). A routine procedure for a no-carrier-added product of high specific activity uses a 150 MeV a particle beam for the reaction 27Al(01,3p)~8Mg yielding batches of a few mCi after 6 hours of bombardment (8).Photonuclear production via the reaction 3oSi(y,2p)28Mg has been investigated earlier by others, who reported yields of 20 pCi of 28Mg using high-energy Bremsstrahlung generated by a 60 MeV e-beam (6).There is an on-going effort to explore the potential of the 500 MeV e-linac of our Institute for producing certain radionuclides of interest for application. The inherent problem associated with this kind of work is the necessity to have bulky targets in order to cope with the high penetrating power of Bremsstrahlung and the low cross sections of photonuclear reactions. We recently reported on the production of 67Cu using a low energy beam (Ee-I 140 MeV) (10). The production of BMg is considered a test case for production at the high energies available, notably at the site where the waste beam of physics experiments is dumped.To this end we measured photonuclear cross sections of a number of production reactions, studied targetry problems and designed procedures for the chemical separation of BMg from the bulk of target material (several tens of grams) and for its final purification. Cross sections (0,) measured are compiled in Table 1. 8A1 (tl13= 2.241 min, E = 2.86 MeV, E = 1.779 (100 %)). Argon has the disadvantages of having a very low cross-section as well as providing a low-density target if gaseous. Notwithstanding its low cross section phosphorus is still preferred over silicon as aptential target. One reason is that the 100 % natural isotopic abundance of 3lP versus 3.09 % for OSi overcompensates the lower cross section of 31P by a factor of about three in yields. Another reason is that some phosphorus compounds allow for elegant and more efficient target chemistry.

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Production of Mg28 in the pile and cyclotron at Harwell

Cited by 11 publications

References 4 publications

Nucleonics

Nucleonics

Separation of ²⁸Mg from Reactor-Neutron Irradiated Li-Mg Alloy and Redetermination of its Half-life

Photonuclear production of ²⁸MG(→²⁸AL)

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Production of Mg28 in the pile and cyclotron at Harwell

Cited by 11 publications

References 4 publications

Nucleonics

Nucleonics

Separation of 28Mg from Reactor-Neutron Irradiated Li-Mg Alloy and Redetermination of its Half-life

Photonuclear production of 28MG(→28AL)

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Separation of ²⁸Mg from Reactor-Neutron Irradiated Li-Mg Alloy and Redetermination of its Half-life

Photonuclear production of ²⁸MG(→²⁸AL)