Abstract
An apparatus for multiple filling of a cyclotron target with enriched Kr gas is described. The system is based on recycling pressurized gas by cryogenic pumping between the target tube and storage containers. The design and construction makes use of previous experience in the construction and operation of two analogue apparatuses for Xe124 high pressure gas targets, but major modifications have been incorporated, evoked by the different physical properties of Kr, by the character of the nuclear reaction, and by the demand for automation from the side of the end user.
Highlights
Description of the apparatusThe pumping system consists of a diaphragm vacuum pump DP and a turbomolecular pump TMP, which can be separated from the rest of the apparatus by the valve V0
1 Introduction ter Cyclotron – 81mKr (T1/2 produced 81Rb (T1/2 = 4.58 H) and = 13.3 s) constitute a radionuclide its daughgenerator for nuclear medicine used as a common tool for lung ventilation studies
The authors have experience in constructing and operating of filling and recycling apparatus for production of 123I on electron accelerators [1], [2] for gaseous Xe targets
Summary
The pumping system consists of a diaphragm vacuum pump DP and a turbomolecular pump TMP, which can be separated from the rest of the apparatus by the valve V0. The surface temperature of the containers is measured by thermocoax thermocouples T1 and T2, wound along the heating elements in several grooves and connected to two-level comparators. When the nitrogen has been boiled out and the temperature, as measured by thermocouples NBS1 and NBS3, reaches 0 °C the power is automatically reduced to 35 W. At this heating power the temperature is stabilized at about 80 °C. High power heating is switched on by a starting impulse, activated only if there is liquid nitrogen in the Dewar flask. All the electronic blocks are kept at a sufficient distance from the beam to prevent radiation damage
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