Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1991-12-17
1993-09-07
Willis, Jr., Prince
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
2504831, 25230117, 25230135, 25230133, 25230136, G01T 1203, C09K 1106
Patent
active
052431932
DESCRIPTION:
BRIEF SUMMARY
The object of the invention is a detection material for ionizing radiation, having at least one organic and/or inorganic scintillating compound and primarily intended for detecting radioactive samples that reside on a support material. The detection material is intended for detecting ionizing radiation in an arrangement where radioactive samples situate on a measurement support, such as a filter plate or alike, and into which detection material, such as scintillator, is added before the measurement.
The invention relates in the first place to liquid scintillation counting from a filter plate. A liquid scintillation counter of this type is e.g. that manufactured by the applicant Wallac Oy with the trade name 1205 Betaplate. With this instrument, samples labeled with radioactive markers are measured that situate on a filter plate or on other corresponding plate. The size of the filter plate used by the applicant is 10 cm.times.25 cm. On the plate samples are positioned in 16 rows so that there are 6 samples in each row. The total number of samples on the plate is 96. Every sample situates on an area with the diameter of 9 mm.
According to a known method, the filter plate on which the samples to be investigated situate, is put into a flat plastic bag for the measurement, and about 10 ml of liquid scintillator is added. The bag is sealed e.g. with a heat sealer and is placed in a measuring cassette of 1205 Betaplate liquid scintillation counter. The liquid scintillator converts part of the radiation energy emitted by the samples into light that is measured with the photomultiplier tubes of the scintillation counter.
A drawback of this known method has been that in some cases the samples on the filter plate have been noticed to gradually dissolve into said liquid scintillator. If the samples then get mixed with each other, serious errors are introduced in the measurement.
The object of the present invention is to create a new detection material that is solid at room temperature and e.g. plate-shaped, but can be melted to fluid by heating it to a temperature of about +100 C whereby the material penetrates into the filter plate. The measurement is performed after the detection material has cooled and solidified.
The detection material according to the invention is characterized in that said detection material is solid at room temperature, but for bringing said detection material into intimate contact with said support material and radioactivity thereon, said detection material is optionally meltable to fluid by heating. One essential component in said detection material is a low molecular weight aromatic polymer, preferably a thermoplastic resin that contains low molecular weight polymer molecules of styrene and/or styrene derivatives.
The meltable detection material plate, or scintillator plate, according to the invention, removes the problem described above, because the samples do not dissolve into the solid scintillator plate.
The other characteristics of the invention are presented in the patent claims below.
In the following, detection material according to the invention and its use are described with the disclosed drawings where
FIG. 1 presents the detection material plate and the filter plate on which the sample has been positioned.
FIG. 2 presents the plates of FIG. 1 laid on each other.
FIG. 3 presents the filter plate of FIG. 2 into which the detection material plate has been melted.
The scintillator plate made of the detection material according to the invention is used e.g. in the following way:
The filter plate 1, on which the samples 2 to be investigated situate, is put into a flat plastic bag into which also the solid scintillator plate 3 is added that is of the same size as the filter plate. The thickness of the scintillator plate is e.g. 0.2-2 mm. After this, the solid scintillator plate 3 is melted into the porous filter plate 1 with e.g. a hot metal plate. During the melting period the liquid formed by the material of the scintillator plate penetrates so near the radiation emitting sample molec
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patent: 2745967 (1956-05-01), Ludeman
patent: 3457180 (1969-07-01), Kretz et al.
patent: 3853584 (1974-12-01), Tatsuta et al.
patent: 4375423 (1983-03-01), Cusano et al.
patent: 5155364 (1992-10-01), Fijii
Oikari Timo
Suontausta Jari
Diamond Alan D.
Wallac Oy
Willis Jr. Prince
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