1. A gas turbine comprising:
a guide vane assembly; and
a securing ring for axially locking the guide vane assembly in position, the securing ring having a radially outer rim configured in a housing-side groove, a radially inner rim configured outside of the groove, and a slot extending from the radially outer rim to the radially inner rim, and a first flank of the slot having a radially inner rim section and an undercut portion, the radially inner rim section forming an angle of at least 50\xb0 with the radially inner rim.
2. The gas turbine as recited in claim 1 wherein the radially inner rim section forms an angle of at least 85\xb0 with the radially inner rim.
3. The gas turbine as recited in claim 1 wherein the undercut portion forms an angle of at least 85\xb0 with the radially outer rim.
4. The gas turbine as recited in claim 1 wherein the undercut portion forms an angle of at least 110\xb0 with the radially outer rim.
5. The gas turbine as recited in claim 1 wherein the undercut portion has an oblique surface forming an angle of at least 110\xb0 with the radially outer rim.
6. The gas turbine as recited in claim 5 wherein the slot has a second flank facing opposite the first flank in the circumferential direction and configured to be parallel to the oblique surface.
7. A method for manufacturing a gas turbine as recited in claim 1 comprising the step of inserting the securing ring in an elastically deformed state into the groove, while reducing the clearance width of the slot.
8. The method as recited in claim 7 further comprising the steps of forming the undercut portion and forming the radially inner rim section.
9. The method as recited in claim 8 wherein the undercut portion and the radially inner rim section are formed by machining, cutting or thermal removal.
10. The method as recited in claim 9 wherein the undercut portion and the radially inner rim section are formed by thermal removal.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A separation device of radioisotope Tl-201, comprising:
a dissolving unit;
a vacuum unit, said vacuum unit being connected with a first control valve, a second control valve and a third control valve;
a first glass unit, said first glass unit being connected with a fourth control valve at an end of said first glass unit, said first glass unit being connected with said first control valve at another end of said first glass unit, and said first glass unit being connected to said dissolving unit at a side of said glass unit;
a sedimentation unit, said sedimentation unit being connected with said fourth control value at one end and with a three way control valve at the other end;
a second glass unit, said second glass unit being connected with a fifth control valve at an end of said second glass unit, said second glass unit being connected with said second control valve at another end of said second glass unit;
an ion exchange column, said ion exchange column being connected with a sixth control valve at an end of said ion exchange column, said ion exchange column being connected with said fifth control valve at another end of said ion exchange column;
a Pb(lead)-201 collection bottle in communication with said sixth control valve;
a third glass unit, said third glass unit being connected with a seventh control valve at an end of said third glass unit, said third glass unit being connected with said third control valve at another end of said third glass unit; and
a Tl(thallium)-203 collection bottle in communication with said seventh control valve.
2. The device according to claim 1, wherein said three way control valve is connected with an eighth control valve.