I. Mahunka

Excitation functions of proton induced nuclear reactions on natRb from 30 to 70 MeV. Implication for the production of 82Sr and other medically important Rb and Sr radioisotopes

Cross-sections and integral production yields of the natRb(p,xn)82,83mg,85mg,87mSr and natRb(p,X)81,82m,83,84mg,86mgRb nuclear reactions have been measured as a function of the proton energy from 30 up to 70 MeV. The standardization of the nuclear data for production of a 82Sr(82Rb) generator system and of the 83Sr radioisotope, their production possibilities, and the impurity levels are discussed.

Excitation Function of the 35Cl(α,n)38K Reaction Using Gas Targets

The /J-emitting radioisotope 3 K (Γ1 / 2 = 7.6 min) is an important tracer for blood flow measurement with PET [cf. 1 —4], For routine production the Cl(oc,n)K nuclear reaction involving a solid NaCl target is used [cf. 3 — 5]. The excitation function of this reaction has been measured using solid targets [4]. We present our results on the excitation function measured with chlorine gas targets. These experiments were carried out in view of the possibility of use of a corrosive gas as target material.

Excitation functions for production of 88Zr and 88Y by proton and deuteron irradiation of Mo, Nb, Zr, and y

Cross sections for production of 88Zr and 88Y were measured for proton and deuteron induced nuclear reactions on Mo, Nb, Zr and Y targets up to 80 MeV proton and 50 MeV deuteron energy. Stacked foil activation technique and high‐resolution γ‐spectrometry were used for irradiation and for detection of the radioactive residuals. The experimental data up to Ep=100 MeV and for Ed=50 MeV were compared with the earlier literature data and with the theoretical calculations based on the ALICE‐IPPE code. Production yields of the different production routes are compared.

Study of the natC(3He,2α)7Be and 9Be(3He,αn)7Be nuclear reactions and their applications for wear measurements☆

Abstract Kapton (C22H10O5N2) and beryllium samples were irradiated with a 28 MeV 3He beam in order to determine the cross section of the natC(3He,2α)7Be and 9Be(3He,αn)7Be nuclear reactions using the stacked-foil technique. Stacks of Kapton-Al and BeAl foil pairs were also irradiated for investigation of the recoil-implantation of the 7Be into a depth of a few micrometers and to determine the implanted activity as a function of the bombarding energy. With this method the wear of materials (e.g., plastics, Al, etc.) can be measured which do not contain a suitable element for charged particle activation.

IODINE-123 PRODUCTION AT A SMALL CYCLOTRON FOR MEDICAL USE

An improved method has been developed to obtain highly enriched [123Te] tellurium for the production of medically important123I. Excitation function of the123Te(p,n)123I reaction, production yields and radionuclidic impurity levels were determined as a function of bombarding energy and target thickness.

Pure iodine-123 production by small cyclotron for medical use

For improvement of radionuclidic purity of123I a method was elaborated to obtain highly enriched [123Te] tellurium. Using this new TeO2 target the optimum irradiation conditions have been investigated for the production of123I via123Te (p,n)123I and the radionuclide impurity levels were also determined.

Trace element analysis by using the direct CPAA method

Abstract Multielemental trace analysis was performed at Turku Cyclotron Laboratory on purified industrial aluminium samples and Ultra-High-Purity aluminium standards, produced by VAW (FRG), by using the direct CPAA (Charged Particle Activation Analysis) method. Both types of Al were expected to contain less than 10 ppm trace element contamination. 8 to 10 MeV proton beams were used for irradiation. The absolute trace quantities were determined for some ten elements by using the cross section curves and calculating the ranges of the bombarding particles in the samples, and measuring the absolute beam current and the intensities of the characteristic gamma-lines of the activated isotopes. The investigated elements are: Ca, Ti, V, Cr, Fe, Ni, Cu, Zn, Ga, Br and Zr. The obtained results were in good agreement with the guaranteed (VAW) data.

Status report on the fast neutron irradiation facility for radiobiological purposes at the debrecen cyclotron

Summary Supported by IAEA, an isochronous cyclotron for protons (2 – 20 MeV), deuterons (1 – 11 MeV), 3 He ions (4 – 28 MeV) and alpha particles (2 – 22 MeV) is operated since 1985 by the Hungarian Academy of Sciences in Debrecen. Fast neutrons for biomedical applications are produced with beryllium and deuterium targets. Dosimetry is performed with ionization chambers, TLD and nuclear track detectors.

Application of an MGC-20 cyclotron and methods of radioecology in solution of problems of forestry and the wood industry☆

Carrier-free 24Na radioisotopes (T12 = 15.06 h) produced via the 27Al (n, α) 24Na reaction using an intense fast neu an MGC-20 cyclotron and a new injection technique were used for in vivo radioecological investigations. An advantage of the method is the measuring possibility of the water transport in healthy and sickened trees with low radioactive hazard and fast decrease of activity in the experimental area. The method was used to obtain information on the reasons for the new type of early and sudden death of trees in oak (Quercus petraea) forests in Hungary.

Excitation functions of proton-induced reactions on natSn and natCd: Relevance to the production of 111In and 114mIn for medical applications

Excitation functions of proton induced nuclear reactions were measured for application purposes up to 80 MeV proton energies on natural Cd and Sn targets. The measured excitation functions were compared with the experimental results reported in the literature and with the results of theoretical calculations using the ALICE‐IPPE code. In the present work we report on the excitation functions, the deduced integral yields and impurity levels related to the production of the medical radioisotopes of indium (111In, 114mIn). High energy production routes by using Cd, In and Sn targets are compared.