DE1698017U - FILTER ARRANGEMENT FOR RADIATION MEASUREMENTS. - Google Patents

Description

IM iwJI O ¹ TiJU. J.ÜU

FiIt e r- a η ο r d η u η g for S t r a Ii 1 e ti -

! limber gar, Privatdozent Dr i'elis: T / achsnann)

It is well known that certain bodies, or as ionizing rays, are known chemically or pny si kali see changed ». These effects will exploited the dose and the quality of the incident Rays to hestimraen. 12in such by ionizing Radiation triggered process depends on the radiation quality. Kit help:? of different radiation-absorbing Substances can selectively produce these phenomena influenced veriec. For example in the film dosimetry can make use of this by using i'ilme in easettes includes, in which different i'ilter in the form of different radiation absorber substances are attached, ■ whereby according to the different degrees of hardness of the Radiate various blackenings of the i'ilme at the Irradiation occurs * · mac recognizes from the blackening of the films the radiation dose, from the relative blackening of the individual ij'ilmteiles behind the different! filter " you can determine the hardness of the radiation hit. -"egg The filters correspond to the previously known application arranged »That means radiation-absorbing substances the same half-layer are up according to height and side in the same place in front of and behind the films. This happens, among other things, with irradiation regardless of their I want to create the same physical conditions " LIt this method cannot be determined by which i-iclituna the radiation has entered. It is also known that this method is used with two films

'respectively. Cassette is used. Here Dian is from the Necessity assumed. That a cassette after first time irradiation is submitted for evaluation! While the second Cassette or the zi ^ eito i'ilm should remain with the carrier. Even with this application, the disadvantage ordered that as well the direction of the radiation cannot be determined. An-r on the other hand, the “evaluation of the second film is also very good difficult .. Is the filter in front of the first oil level arranged in such a way that that this must be removed with the film, is so It was impossible to avoid it after the first film was removed the conditions are unequal for the second film. But these are also in the case of a second film when irradiated from both sides Not to be avoided anyway, provided that the first film should be exposed to the same conditions from the front and rear.

These disadvantages are daclurcl? It is impossible for the emitter-absorbing substances acting as a tilter to be offset from one another. This means that depending on the sighting eggs ^! Corresponding radiation that are blackened differently and the same changes occur even when two or more films are used at specific points in each case.

The arrangement is not restricted to the fact that jfilaie can be used as bodies that are chemically or physically changed when exposed to ionizing rays, as all substances can come into question as long as they only change under the influence of ionizing rays (e.g. the phosphor glass dosimeter). The I ¹ O rni of the cassettes can be made arbitrarily.

In the absence of two sketches, there are two possible arrangements the filters included in the invention are shown.

Fig.l shows schematically a Poppelkassette with a rear wall, a front "Jana of the cassette I and a front V. ^{r on} the cassette II in section" The cassettes are attached to each other in some way so that they can be separated from each other and from the - lüekwanß can replace animals, in everyone

The cassette contains a film that - at a certain point from the sides are shielded by a filter. The two filter systems are arranged offset from one another »Both films are received by Muten and from the front in the Filtei-covered field with the same density. Either of the two Film registers the incident radiation in the filter field independently of »others» Since the filters have the same strength, is on the second iilni after removing the first cassette a newly entering radiation is registered in an equivalent manner. From the difference in blackening on film I and II the intensity of the incoming radiation can be seen. The direction of irradiation can be seen from the fact that when exposed to film I from the front, the vision is more pronounced ia filter-free fiaua occurs as in film II »At irradiation from behind, the situation is reversed. Fig »2 shows a lainzelkas full with a front and back wall., In this there is a film that looks like this from both sides from the. The filter is covered with a part on each side of the film remains filter-free. Compared to the filter-covered FeS the i-'ilm is blackened differently on the filter-free field on the side facing the radiation source »From this the direction of radiation can also be seen here»

Claims (2)

PA.19318Ma3.S5 1.) Arrangement for determining the radiation dose and radiation quality with --4.1'fe of bodies that are chemically or physically changed by ionizing radiation using the filtering effect of radiation absorbing ^ η substances, characterized in that the radiation-absorbing substances acting as filters be arranged offset from one another. 2.) Arrangement according to claim. 1, characterized in that the filters on the front and back of the body which can be chemically or physically changed by ionizing radiation have different widths or l ^; have orm. 3 *) arrangement according to claim 1, characterized in that when using two or more changeable bodies, the filters surrounding them relative to one another have different spatial arrangements.