Radiant energy – Invisible radiation responsive nonelectric signalling – Optical change type
Patent
1989-11-01
1991-11-19
Hannaher, Constantine
Radiant energy
Invisible radiation responsive nonelectric signalling
Optical change type
G01T 104, G01T 300
Patent
active
050668633
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for ascertaining the integral value of the local dosage of ambient high energy radiation.
The increasing employment in industry of high energy radiation for a large variety of purposes and the undesired appearance of such radiation in, for example, high energy particle accelerators, has justifiably necessitated consideration of monitoring. Here it is particularly important to ascertain the radiation dosage which, for instance, a human body has received on a cumulative basis in order to provide conclusions about possible injuries and possible reduction in quality in products on account of such radiation load.
In conjunction with the foregoing one has ascertained (see e.g. Nuclear Technology Publishing, RADIATION PROTECTION DOSIMETRY, vol. 9, No. 4, pp. 227281 of 1984) that it is practical and reasonable to provide for a measurement technique based on paramagnetic properties of the amino acid alanine. It was found that alanine, when subjected to higher energy radiation, forms long lasting free radical points and loci which constitute an indication of the respective local radiation received.
This general discovery, however, has not yet yielded particularly simple and comparatively economic devices or arrangements for ascertaining the radiation load. Therefore in many instances when high energy radiation has to be used in research or production, uncertainty still exists about the radiation load in any particular area and/or within any specific volume, room or the like. Hence, uncertainty exists concerning the expected use life of the equipment exposed to such radiation under the assumption that certain deterioration continues on a cumulative basis. This includes engineering efforts in the field of electrical cable specifically involving supply decontamination. In the case of damage, consequential damages may arise to a considerable extent.
DESCRIPTION OF THE INVENTION
It is an object of the present invention to provide for the feasibility of ascertaining the existing radiation dosage in any area within any room or in relation to any particular product.
In accordance with the preferred embodiment of the present invention it is suggested to provided a self carrying or integratable, shaped strand, being integratable into strand elongated stock such as electrical cable, tubes, or the like and being made of an extruded material containing substances which provide an optically visible change and/or otherwise detectible modification of its molecular structure when subjected to high energy radiation, thus constituting a radiation integrator. The inventive, elongated radiation integrator or integrating detector will either be associated with stock to be monitored in close proximity thereto; or physically connected or integrated and/or actually be a part of this stock. Such elongated objects generally can be manufactured in any length but can also be installed in areas in which nuclear radiation may appear either as a known fact or on the basis of any assumption. Elongated stock may e.g. be provided as electrical cable, as power supply lines or as decontaminant lines to be installed in guide chutes or the like. The integrating radiation indicator, either separately or as stated in the physically integrated or combined fashion concerning existing tubes, cable or the like may be used in that, from time, to time in that pieces (samples) are simply cut from the shaped strand in order to ascertain the radiation dosage this particular cut-off portion has received. It is not essential in principle to provide for a regular inspection in this fashion, which is particularly so if, on the one hand, the area is accessible and if on the other hand indication of any optical-visual change is additionally provided for as an observable phenomenon. Here then visual inspection may be sufficient in order to determine whether or not there was any kind of radiation exposure at all; if some exposure is visibly detected in this fashion one may cut off a certain portion o
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Chadsey et al., "Radiation-Induced Signals in Cables", IEEE Transactions on Nuclear Science, Nr. 6, Dec. 1976, 1933-1941.
T. Kojima et al., "Alanine Dosimeters Using Polymers As Binders", Applied Radiation & Isotopes, vol. 37, No. 6, 1986, Pergamon Journals Ltd., pp. 517-520.
Hanisch Ferdinand
Schleese Eckard
Glick Edward J.
Hannaher Constantine
Kabelmetal Electro GmbH
Siegemund Ralf H.
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