CS235779B1 - Connection of multi-detector measuring equipment for low-energy gamma emitters - Google Patents

Abstract

The principle of the multidetector measuring device for low-energy gamma emitters consists in the fact that sixteen identical nuclear radiation detectors (1) are connected to a high voltage source (2) and to the inputs of sixteen identical linear amplifiers (3) » with inputs of sixteen discriminators (4) whose outputs are connected to a central unit (5) which is further connected and an LED display (6) further with a typewriter (7) and finally with a punch (8). This connection greatly accelerates the measurement of a large number of samples and is particularly suitable in human and veterinary medicine where low-energy radiation, especially 125-iodine, labeling can be used. Connecting the punching punch in ASCII «or CCITT allows direct input for processing computer results or transferring results with a conventional five-track teletype.

Description

BACKGROUND OF THE INVENTION The present invention relates to a multi-detector measuring device for low-energy gamma emitters, particularly suitable for the measurement of samples in radiosaturation analysis in human and veterinary medicine, labeled with these emitters.

Single-detector meters with mechanical sample changers, so-called gamma-automats, are currently used to measure these samples. Their disadvantage is high mechanical failure rate, low measurement speed and the consequent unbearable time for measurement of a larger number of samples.

The above-mentioned drawbacks are eliminated by the connection of a multi-detector measuring device for low-energy gamma emitters according to the invention, which is based on the fact that sixteen identical nuclear detectors are connected to a high-voltage source and inputs to sixteen identical linear amplifiers. identical discriminators whose outputs are connected to a central unit, which is further connected to an LED display, longer to a typewriter and finally to a punch ·

The advantage of the present invention is that with simultaneous measurement of sixteen samples in sixteen nuclear detectors as compared to gamma-autornates, the measurement time is significantly reduced, with up to sixteen samples at the same number of samples. Another advantage is the possibility to use cassettes for 16 samples, which are inserted manually into the measuring device, which eliminates mechanical sample changers and significantly reduces the failure rate. · Used detectors are optimized for measuring low-energy emitters and discriminators have appropriately set lower and upper discriminatory level. reduces background count ·

BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated in more detail by the accompanying drawing, in which an embodiment of the invention in block diagram is shown. The circuit consists of sixteen identical detectors of nuclear radiation 1, which are both connected to the medium voltage source 2 and secondly to the inputs of sixteen identical linear amplifiers whose outputs are connected to the inputs of sixteen identical discriminators 6 whose outputs are connected to the central unit 2. it is further connected to the LED display 6, to the typewriter 2 and finally to the punch 8.

- 2 235 78 »

The nuclear radiation detectors 1 are preferably test scintillation well scalillation detectors Nal / T1, optimized for measuring low-energy emitters. For example, the high voltage source 2 is a conventional converter type with a fixed output voltage and a delayed start-up of the output voltage upon power-up. The amplifiers 6 are broadband linear amplifiers fitted with, for example, integrated operational amplifiers. The central unit 8 is of the processor type with a short cycle time of the order of 10 ^ sec to ensure a short dead time. The LED display 6 consists of five numerals of LEDs, preferably operated in a dynamic mode. has an electrically suppressed listing of insignificant zeros · Punch 8 punches results in either full ASCII or CCITT code, including insignificant zeros; for example, the Consul 333 · 3 is used

The invention is particularly suitable for measuring a large number of samples of radiosaturation analysis in human and veterinary medicine. It is also suitable for other examination methods using low-energy gamma emitters, especially 1-125.

The advantage of the connection according to the invention is the possibility of selecting the output code on the punched tape, which allows evaluation of results by own computer and sending results for evaluation by teletype · Another advantage of the connection is arrangement of descriminators enabling correction for the same efficiency of individual detectors. processing of a large number of samples in a short time - up to 900 samples per hour, low failure rate, small measuring device dimensions and ease of operation.

Claims (1)

SUBJECT OF THE INVENTION 235 779 Connection of a multi-detector measuring device for low-energy gamma emitters, characterized in that eighteen identical nuclear detectors (1) are connected to both a high-voltage source (2) and inputs of sixteen identical linear amplifiers (3) whose outputs are connected to inputs of sixteen of the same discriminators (4) »whose outputs are connected to the central unit (5), which is longer connected to the LED display (6), to the typewriter (7) and to the punch (8)