DD265538A3 - SHIELDED, LOCATED PORTABLE - Google Patents

Abstract

The invention relates to a shielded, portable container for processing and metered removal liquid, radioactive media, in particular Radiotracern for marking process engineering systems. The container is inventively characterized in that inside a shield vertically above each other, a mixing tank and an accident tank are arranged, which connects a spacer. In the mixing tank at least one Radiotraceraufnahme, a stirrer and the bottom dosing valves are arranged. The shield before an eruption in the spacer is removable. The cover of the damaged tank is designed as a filling platform and has leading into the tank failure leading devices for liquid media. The use of the container is permitted outside of radiation protection rooms; A contamination in case of accidents during the removal is safely prevented. figure

Description

For this 1 page drawing

Field of application of the invention

The invention relates to a shielded, portable container for processing and metered removal of liquid, radioactive media, in particular of rediotracers for marking process engineering system,

Characteristic of the known state of the art Radioactive tracer materials are generally I ^ '"^ know traded Minimum activities. The relation of a large number of Subsets of low activity, as used for example to mark procedural systems in determining their Flow characteristic are needed, is practically not feasible. The assembly of the radiotracer material in

desired activity and number of samples is incumbent, in compliance with appropriate radiation protection

Safety regulations, the user. A simple device for this purpose is a shielded burette whose outlet fills suitable sample containers. A physical or chemical processing of commercially available tracer material must then precede the filling process. Such treatment of the tracer outside appropriate radiation protection room is not permitted. The decor of Radiation protection rooms in production plants for one-off or temporally far apart, repeated Conducting flow investigations in process engineering processes is, however, very costly. For the repeated, distributed over a longer period of confectioning offers in radiochemical laboratories of Use of generator systems for generating short-lived radionuclides, as described in Pippel, W.

Technological fluid dynamics "Akademie-Verlag Berlin 1978 are described.

Such radionuclide generators contain a relatively long-lasting radionuclide, which in another, more short-lived

decays, which then turns into a stable radionuclide. The long-lived radionuclide is fixed on an ion exchanger or the like in a suitable container and the short-lived radionuclide is confused; eluted from this arrangement.

This method is preferred in radiological facilities of medicine for diagnostic or therapeutic purposes

Applied to PI-PS 63005 is a Mo-99 / Tc-99m generator for the direct recovery of sterile radioactive eluate for

Use in medicine known. A shielded transportable container contains a column containing the radionuclide. To Piercing a top closure of the column, a liquid is introduced and the collecting eluate is on Bottom of the column after piercing the lower closure, for example with a syringe, in the required amount

taken.

In case of damage to the lower closure odor at the removal device is an inadmissible contamination of the Site of the tank. Its use is therefore on radiation protection rooms with appropriate safety devices

limited.

As the number of elutions increases, the short-lived radionuclide contamination increases with the long-lived radionuclide,

so that a use as Radiotracer radiation protection technology reasons difficult. This circumstance becomes particularly serious when a large number of subsets of the same activity is produced once, which makes the

Use of Nuclid generators for carrying out tests in constantly changing locations and different Conditions of use for reasons of complex radiation protection measures excludes. In the flow marking, z. In all-electric heated glass furnaces, specific activities of 60-75Bq / g

sought. Since the exemption limit for the delivery of radioactively contaminated material is substantially lower than this value, the entire production incurred during the experimental period must be allowed to settle on this activity concentration by intermediate storage, even if it has been delivered. The cooldown period is 7 to 9 half lives

Radionuciids, which is technologically acceptable, for example, for the daughter arc of the Ba-140 / La-140 generator

Interim storage periods of 12 days results. If the daughter nuclide La-140 is contaminated by the parent nuclide Ba-143, which, as mentioned, is precluded by light, the user runs the risk of temporarily storing the entire production occurring during the examination period about 9 (M 50 days technologically unacceptable. The same applies to the broken circuit.

It is further known a container for transport and metered removal of radioactive media from DE-PS 2649295. By Druckfoeaufschlagung a radioactive test gas contained therein is removed from the shielded container and introduced, for example, in the test section. Quick-acting closures in the inlet and outlet lines should prevent contamination. The flow-marking systems used in glass-melting furnaces, such as La-140 in the form of LaCU and Au-198 in the form of AuCU, can not be converted to the gaseous state, which precludes the use of this device in this case.

For use in the silicate industry also encapsulated mixers for the treatment of tracer materials are known. The radionuclide is added to a certain amount of the feed. The emptying succeeds: once and is done automatically. A packaging of Tracermaterielien is not sought when using this device and is not feasible with the required uniformity.

Object of the invention

The object of the invention is to reduce by Einsau elites shielded, portable container, the cost of the preparation and dcsierbare removal of liquid radioactive media, in particular radiotracers for marking process engineering systems, and to increase the safety at work.

Explanation of the essence of the invention The invention has for its object to provide a shielded, portable container for processing and dosable Taking liquid radioactive media constructively so that its use outside of radiation protection rooms without

additional safety equipment is permitted and safely prevents contamination in the event of a breakdown

The object is achieved according to the invention by a mixing tank and vertically in the interior of the shield of the container

including a damaged tank are arranged. The mixing tank and the waste tank are connected by a spacer. in the

Mixing tank is at least one receptacle for a radiotracer present, preferably as a vial breaker

is trained.

Next is located in the mixing tank an agitator and at its bottom metering valves are arranged. The lid of the Havariete nks is designed as a filling platform. It has inclined to the container axis discharge devices for liquid media

that lead into the disaster tank.

After weitsren features of the invention, the lid of the mixing tank, the recording or recording and the agitator

combined into a unit which is removable from the mixing tank.

Furthermore, it is provided that the ALIeiteinrichtungen In the cover of the damaged tank of a filling platform

surrounding, annular recess go out.

Advantageously, the spacer between the mixing tank and the emergency tank umgobendo shield consists of removable Half shells. Ausführungsbelsplel The invention will be explained with reference to a nichatischen drawing, for example. A cylindrical mixing tank 1 is screwed vertically aligned with an approximately semi-cylindrical spacer 2, which on

a Havarietank 3 is arranged. This arrangement is of the shield 4; 4 'surrounded; Lid 9 and bottom 14 of the

Mixing tanks are dimensioned as a shield; Cover 9 'and bottom 14' of the damaged tank 3 are also made

shielding material.

The mixture 1 occupies a defined volume of a solvent 6 which contains at least one of the contents Radiotracer ampoule β after its fragmentation, with effective homogenization by a motor-driven agitator 8,

dissolves.

The receptacle 7 for din Fladiotracerampulle 6 is advantageously formed ice ampoule breaking device, of which several in the Ceiling '9 can be arranged soin. Cover 9, receptacle 7 and agitator 8 are assembled into a compact assembly,

which is removable from the mixing tank 1 for filling and cleaning thereof.

Dos homogeneously mixed with the radiotracer 5 solvent is in constant operation of the motor-driven agitator 6,

after passing through a sieve filter 10 by actuating two for safety reasons independently boiAtigender

Dosing valves 11 dosed in subset container 12 The subset container 12 are by the, due to the

approximately half-cylindrical shape of the spacer 2 resulting outbreak with suitable manipulators on the

Bottling platform 13 placed. The arranged before the outbreak, consisting of half-shell shield 4 'is this

decreased.

This is harmless to safety engineering as the subsets only account for a fraction of the total activity. The decrease in the shield 4 ° is possible in spite of dense system of shielding in that the upper, the Mix tank 1 enclosing Toil the shield 4 rests on the shoulder 19 of the bottom 14, while uoi unioro, the Havarietank 3 shielding part of the shield 4 of a readily decontaminable base plate 18, on which the

entire container is fixed, is worn. To improve the stability and Abschirmwii effect are the

Shielding elements provided with stepped, cylindrical recesses. As a filling platform 13 is the centric,

used somewhat deeper part of the lid 9 'of the failure tank 3, in which discharge devices are further provided for the liquid medium. Thus, lead from the filling platform 13 at least four gutters 15 in the ring around the filling platform 13 extending recess 1 β. From the bottom at least two outlets 17 direct the medium, if necessary, into the accident tank. These outflows 17, z. B. holes are each at an angle greater than 20 ° to the Behälterachae - the vertical-inclined and the sum of their cross sections is about ten times the outlet cross section of the metering 11. An oblique arrangement of the outflows 17 minimizes the radioactive radiation from the disaster tank. 3 The dosage is achieved by graduation on the partial quantity containers 12 or an automatic control influenced by the level or the activity. The Toilmengenbehälter preferably consist of process-inherent material. After completion of the filling process, the elements of Abschii tion 4 'before the Ausl,. brought and so the shield 4; 4 'completely closed. Any traces of tracer can thus be safely stored until the radioactivity dies down.

With the container according to the invention, the mixing of the radiotracer with a solvent S, the homogenization of the solution and the packaging can be carried out outside of radiation protection rooms at any desired ion, particularly advantageously close to the system to be fluidically investigated. The use of the container does not require any additional safety precautions at the site with regard to the contamination due to the purchase of radioactive medium.

In the case of errors during filling or in the case of accidents, the radioactive liquid is safely completely transferred to the waste tank and can be screened there until the radioactivity dies down or removed for disposal.

Claims (4)

1. Shielded, portable container for processing and metered removal of liquid radioactive media, characterized in that vertically below a mixing tank (1) a damaged tank (3) is arranged, the vorbindet a spacer (2) that in the mixing tank (1) at least one , Preferably as an ampoule breaking device formed receptacle (7) for a radiotracer and a stirrer (8) and at its bottom (14) Dosierarmaturen (11) are arranged and that a lid (9 *) of the Haverielanks (3) as a filling platform (13) is and inclined to the container axis, in the disaster tank (3) leading discharge devices for liquid media has. 2. Behälternach according to claim 1, characterized in that in the cover (9) of the mixing tank (1), the receptacle (7) and the agitator (8) are combined to form a structural unit and this from the mixing tank (1) is removable. 3. Container according to claim 1 and 2, characterized in that the discharge devices in the lid (9 ') of a filling platform (13) surrounded, annular recess (16) go out. 4. Container according to claim 1 to 3, characterized in that the spacer (2) surrounding the shield (4 ') consists of removable half-shells.