JPH0525314B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a radioactivity measuring device for a solution in a vial shield and a vial shield used in the device, and in particular, to measuring the radioactivity of a solution in a vial shield without taking out the vial from the vial shield. The present invention relates to a radioactivity measuring device for a solution in a vial shield that is capable of measuring the amount of radioactivity in a vial shield, and a vial shield that is most suitable for the device.

[Conventional technology]

In recent years, in medicine, it has become increasingly popular to inject radioactive compounds into the human body and use the radioactivity concentrated in the affected area to investigate the disease state of the affected area.

To dispense the required amount of radioactivity from a vial into a syringe, the vial is removed from the vial shield, the current amount of radioactivity in the vial is measured using, for example, a Curie meter, and the vial is refilled to avoid exposure. After storing the bottle in the vial shield, I used a syringe to roughly estimate it and then took it out. Then, in order to check whether the amount of radioactivity dispensed into the syringe is the prescribed amount, it is measured with a Curie meter.If it is too much or insufficient, it is returned to the vial or taken out, and the prescribed amount of radioactivity is measured again with the Curie meter. When I measured whether it was being dispensed, I found myself repeating the same process over and over again.

[Problem to be solved by the invention]

However, in this conventional method of dispensing a predetermined amount of radioactivity into a syringe, it is necessary to remove the vial from the vial shield and measure the amount of radioactivity, and to dispense the predetermined amount of radioactivity into the syringe several times. Measuring with a Curie meter had the disadvantage of exposing people to radioactivity as it was done dozens of times a day. Furthermore, radioactivity has a half-life, and the amount of radioactivity changes at that point, so each vial must be removed from the vial shield and measured, which is time-consuming and troublesome work.

The present invention aims to solve the above-mentioned drawbacks, and provides a radioactivity measuring device for a solution in a vial shield that can measure the amount of radioactivity in a vial without taking it out from the vial shield, and a vial shield used in the device. is intended to provide.

[Means to solve the problem]

In order to achieve the above object, the apparatus for measuring radioactivity of a solution in a vial shield of the present invention includes a columnar main body having a recessed part in the center on which a vial shield is placed, and a columnar main body that is movable up and down at least in the recessed part. A main body shutter equipped with one or more engagement pins, a shutter opening/closing mechanism for opening and closing the main body shutter in the vertical direction, a radiation measuring device provided behind the main body shutter, and a radiation measuring device using the radiation measuring device. and a display that displays the amount of radioactivity measured.

Preferably, the recessed portion of the main body on which the vial shield is placed is provided with a guide rail on the mounting table.

In addition, the vial shield has a structure in which a vial is stored inside, and has a guide groove on the bottom that is guided by a guide rail provided on the above-mentioned mounting table, and the vial shield body is made of radioactive shielding material. and a vial shield shutter, which is formed of a radioactive shielding material and has a hole on the side surface of the vial shield body that engages with an engagement pin provided on the main body shutter, and is slidable in the vertical direction. and a lid body having a syringe needle inlet on the upper surface and made of a radioactive shielding material.

[Effect]

When the vial shield containing the vial inside is installed along the guide rail provided on the mounting table of the main body, the engagement pin of the main body shutter engages with the hole provided in the vial shield shutter. When the main body shutter moves downward, the vial shield shutter is also moved downward. Via the open portion of the vial shield shutter, the amount of radioactivity in the vial is measured by a radioactivity detector provided behind the main body shutter.

An embodiment of the present invention will be described below with reference to the drawings.

〔Example〕

Fig. 1 is a perspective view of an embodiment of a radioactivity measuring device for a solution in a vial shield according to the present invention, Fig. 2 is a perspective view of an embodiment of a vial shield used in the device, and Fig. 3 is a bottom portion of the vial shield. 4 is a sectional view taken along the line A-A in FIG. 1 when the vial shield is installed; FIG. 5 is a partial sectional view taken along the line B-B in FIG. 4; FIG. 6 shows the circuit configuration of an embodiment of the radioactivity measuring device used in the present invention.

In FIGS. 1 to 5, a cylindrical main body 1
A recessed portion 2 for placing a vial shield 20 is provided in the center of the container. Below the recess 2 is a mounting table 3 on which the vial shield 20 is placed.
A guide rail 4 is provided on the mounting table 3. At the end of the guide rail 4, a main body shutter 5 is arranged to be movable up and down. A claw portion 5a is provided at the lower end of the main body shutter 5, and the claw portion 5a allows the shutter on the vial shield side, which will be described later, to be opened. Moreover, on the surface of the main body shutter 5, there are 2
engaging pins 6 are provided. A shutter groove 7 for allowing the main body shutter 5 to move downward is provided in the lower interior of the mounting table 3, and a shutter handle 8 is provided on the right side of the main body 1 of the recessed portion 2. By pushing the shutter handle 8 downward, the main body shutter 5 moves downward in conjunction with the shutter handle 8. For example, the shutter handle 8 and the main body shutter 6 are connected by a connecting rod, so that the shutter handle 8 and the main body shutter 6 are interlocked. Behind the main body shutter 5, a radioactivity detector 9 for detecting the amount of radioactivity is arranged along the main body shutter 5, and behind it, the output of the radioactivity detector 9 is appropriately amplified and subjected to predetermined electrical processing. Electric circuit section 10
is located.

A display 11 is provided at the top of the main body 1 to display the amount of radioactivity detected by the radioactivity detector 9.

Note that 12 and 13 are shielding members for shielding radioactivity.

On the other hand, the vial shield 20 placed on the mounting table 3 of the main body 1 is composed of a vial shield main body 21 made of a radiation shielding material such as lead, and a lid body 22.

The vial shield main body 21 has a cylindrical shape with a bottom surface, and a vial is housed in the center thereof. A notch 23 is provided on the side surface of the vial shield body 1, and guide grooves 24 are provided on both end surfaces of the notch 23, respectively. A vial shield shutter 25 is slidably fitted into the guide groove 24. Needless to say, the vial shield shutter 25 is made of a radiation shielding material, such as lead. Holes 26 are bored in the surface of the vial shield shutter 25 at positions to be engaged with the two engagement pins 6 provided on the main body shutter 5 described above. The hole 26 is for sliding the vial shield shutter 25 in response to the vertical movement of the main body shutter 5, and the vial shield shutter 25 also has the function of shielding radioactivity. It is like a hanging hole and does not go through.

A lid 22 is provided at the upper end of the vial shield body 21, and a vial is installed in the vial shield body 1 via the lid 22. When a vial is stored in the vial shield main body 1, by sliding the vial shield shutter 25 downward, the vial can be viewed directly through the opened notch 23.

A circular recess 27 is provided on the outer bottom surface of the vial shield main body 1, and a slide plate recess 28 is further provided in the outer circular recess 27. A slide plate 29 and a spring 30 that is engaged with a protrusion 29c provided on the slide plate 29 are fitted into the slide plate recess 28, and a bottom plate 31 is inserted into the circular recess 27 by screws (not shown). is fixed. Normally, the elastic force of the spring 30 causes the slide plate 2 to
9 protrudes to the position of the vial shield shutter 25 and serves as a stopper. When the end surface of the slide plate 29 facing the vial shield shutter side is pushed, the slide plate 29 retreats.
The vial shield shutter 25 becomes slidable.

When the bottom plate 31 is fixed in the circular recess 27,
The bottom plate 31 and the bottom edge 20a of the main body are configured to be on the same plane, and a guide rail 4 provided on the mounting table 3 of the main body 1 is attached to the bottom plate 31 and the bottom edge 20a of the main body. The guide grooves 32 and 33 guided by the vial shield shutter 25
It is provided in a straight line at the central position passing through.

A vial (not shown) containing a radioactive drug solution is housed in the vial shield main body 21 having such a structure. The vial shield 20 containing the vial is placed on the mounting table 3 of the main body 1, and the guide grooves 32 and 33 provided on the bottom of the vial shield 20 are aligned with the guide rails 4 provided on the mounting table 3. Let, vial shield 20
Slide it toward the main body shutter 5 side and place it. The claw portion 5a provided at the lower end of the main body shutter 5 comes into contact with the end surface of the claw portion 5a of the slide plate 29 provided on the bottom surface of the vial shield 20, causing the slide plate 29 to retreat. By retreating the slide plate 29, the vial shield shutter 25 provided on the vial shield 20 becomes slidable. At this time, the two engaging pins 6 provided on the main body shutter 5 are respectively engaged with the holes 26 provided on the vial shield shutter 25, and the main body shutter 5
The vial shield shutter 25
also move.

When the shutter handle 8 is pushed down,
The main body shutter 5 connected to the shutter handle 8 is lowered, and the vial shield shutter 25 is also lowered accordingly. When the shutter handle 8 is pushed down to the lowest position and stopped at the hook position, the main body shutter 5 and vial shield shutter 25
Both are fully opened, and the vial housed in the vial shield 20 directly faces the radioactivity detector 9. Thereby, the amount of radioactivity of the radioactive drug solution in the vial can be measured with the circuit configuration shown in FIG. That is, in FIG. 6, the symbols 9, 1
0 and 11 correspond to those explained in FIGS. 1 to 5, 35 is a scintillator, 36 is a photodetector,
37 represents an amplifier, and 38 represents an analog-digital converter.

As described above, radioactivity is emitted from the side surface of the vial housed in the vial shield 20 to the radioactivity detector 9. This radioactivity is detected by the scintillator 35 in the radioactivity detector 9, and the scintillator 35 generates photons corresponding to the amount of radioactivity. Photons generated from this scintillator 35 are converted into electrical signals by a photodetector 36, amplified appropriately by an amplifier 37, and then converted into analog signals.
It is digitized by a digital converter 38. Then, it is digitally displayed on the display 11.

When the measurement is completed, the shutter handle 8 is removed from the hook position and is returned to its original uppermost position by the elastic force of a spring (not shown). This causes the main body shutter 5 to return to its original height position.
Accordingly, the vial shield shutter 25 of the vial shield 20 is also returned to its original position and closed. When the vial shield 20 is taken out from the main body 1, the slide plate 29 provided at the bottom of the vial shield 20 moves forward to the position of the vial shield shutter 25 due to the elastic force of the spring 30, It becomes a stop.

[Effects of the Invention] As explained above, according to the present invention, the amount of radioactivity can be measured while the vial is placed in the vial shield. (1) There is no need to take the vial in and out of the vial shield, and radiation The chances of being exposed to radiation are reduced.

(2) When determining the amount of radioactivity, it is not necessary to take out each vial from the vial shield, improving measurement efficiency.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of a radioactivity measuring device for a solution in a vial shield according to the present invention, Fig. 2 is a perspective view of an embodiment of a vial shield used in the device, and Fig. 3 is a bottom portion of the vial shield. 4 is a sectional view taken along the line A-A in FIG. 1 when the vial shield is installed; FIG. 5 is a partial sectional view taken along the line B-B in FIG. 4; FIG. 6 shows the circuit configuration of an embodiment of the radioactivity measuring device used in the present invention. In the figure, 1 is the main body, 2 is the recessed part, 3 is the mounting table, and 4
is a guide rail, 5 is a main body shutter, 5a is a claw part, 6 is an engagement pin, 8 is a shutter handle, 9 is a radioactivity detector, 10 is an electric circuit part, 11 is a display, 20 is a vial shield, 21 is the vial shield body, 22 is the lid body, 24 is the guide groove, 25
is a vial shield shutter, 29 is a slide plate, 30 is a spring, 31 is a bottom plate, 32 and 33 are guide grooves, 35 is a scintillator, 36 is a photodetector,
37 represents an amplifier, and 38 represents an analog-digital converter.

Claims (1)

[Claims] 1. A columnar main body having a recessed portion in the center of which the vial shield is placed, and a central portion of the recessed portion that includes:
A main body shutter that is vertically movable and equipped with at least one engagement pin; a shutter opening/closing mechanism that opens and closes the main body shutter in the vertical direction; a radiation measuring device provided behind the main body shutter; A radioactivity measuring device for a solution in a vial shield, comprising a display device that displays the amount of radioactivity measured by the radioactivity measuring device. 2. The radioactivity measuring device for a solution in a vial shield according to claim 1, wherein the recessed portion of the main body on which the vial shield is placed is provided with a guide rail on its mounting table. 3. A vial shield main body, which has a structure in which a vial is stored, has a guide groove on the bottom surface to be guided by a guide rail provided on the placement table, and is made of a radioactive shielding material, and the vial shield A vial shield shutter made of radioactive shielding material and provided with a hole that engages with an engaging pin provided on the main body shutter and slidable in the vertical direction is provided on the side surface of the main body, and an injection shield is provided on the top surface. A vial shield including a needle injection port and a lid made of a radioactive shielding material.