1. A watch including a case provided with a back cover resistant to ambient pressure, a pressure sensor mounted in an orifice of the back cover with an intermediate ring, and a printed circuit element connected to the terminals of the pressure sensor, said sensor including a rigid substrate provided with said terminals, a tubular casing secured to the substrate in a water-resistant manner and arranged to fit into the intermediate ring, and a pressure-sensitive element, which is mounted on the substrate and located inside the tubular casing,
said watch including a sensor module including at least the intermediate ring, the pressure sensor, the printed circuit element and a sensor support placed against the printed circuit element on the opposite side to said sensor and arranged to withstand the force resulting from the ambient pressure on the sensor, said force being transmitted from said support to the back cover by members for securing the sensor module, wherein the sensor module is mounted in a water-resistant manner and centred in the orifice of the back cover and wherein the intermediate ring includes feet arranged to engage in positioning holes of the printed circuit element without any play.
2. The watch according to claim 1, wherein said feet are further engaged in holes in the sensor support.
3. The watch according to claim 1, wherein said feet are cylindrical.
4. The watch according to claim 1, wherein the tubular casing of the sensor is prominent in relation to a frontal face of the intermediate ring, towards the exterior side of the back cover, and wherein said sensor module is mounted in the back cover in a water-resistant manner by an annular sealing gasket, which is compressed radially between said tubular casing and a wall of the orifice of the back cover, said annular sealing gasket being capable of abutting axially against said frontal face.
5. The watch according to claim 4, wherein the sensor module is centred in said orifice by the annular sealing gasket.
6. The watch according to claim 4, wherein the sensor module is centred in said orifice by driving the intermediate ring into the orifice.
7. The watch according to claim 1, wherein the watchcase includes a middle part, to which the back cover is connected in a water-resistant manner, and a cover covering the back cover externally so as to arrange a chamber between the back cover and the cover in which ambient pressure is transmitted through at least one aperture in the cover.
8. The watch according to claim 7, wherein the cover is secured to the middle part and forces the back cover to abut in a water-resistant manner against the middle part.
9. The watch according to claim 7, wherein the back cover is secured to the middle part in a water-resistant manner and wherein the cover is secured to the back cover.
10. The watch according to claim 7, wherein the back cover includes a first region, in which said orifice and a groove are located on the side of said chamber and which connects said orifice to said aperture in the cover, and a second region having a more flexible part than the first region, said part and said groove being separated by a rigid rib.
11. The watch according to claim 10, wherein a piezoelectric element is secured to said more flexible part to form an acoustic transducer.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A drum-type volume source calibration phantom is placed in a detector, there is an accommodating space inside the detector for receiving a plurality of radioactivity detectors, and the drum-type volume source calibration phantom comprising:
a drum-type container;
a plurality of plate assemblies, stacking inside the drum-type container; and
at least a source plate, located between adjacent plate assemblies, and each source plate having a plurality of sources.
2. As described in claim 1 for a drum-type volume source calibration phantom, the plate material can be metal or non-metal.
3. As described in claim 2 for a drum-type volume source calibration phantom, the non-metal can be paper, wood, plastics, cement and glass.
4. As described in claim 1 for a drum-type volume source calibration phantom, the source is a \u03b3 source.
5. As described in claim 1 for a drum-type volume source calibration phantom, the \u03b3 source can be 57cobalt, 137cesium, 54manganese, 60cobalt or combination of either one.
6. As described in claim 1 for a drum-type volume source calibration phantom, the source is a circular source.
7. As described in claim 6 for a drum-type volume source calibration phantom, the circular source has diameter less than 5 cm.
8. As described in claim 1 for a drum-type volume source calibration phantom, the source plate further comprising:
a bottom cover;
a leak-proof filter layer, formed on the bottom cover, and having a plurality of sources; and
a top cover, formed on the leak-proof filter layer, to protect the sources.
9. As described in claim 1 for a drum-type volume source calibration phantom, the source plate is a circular source plate.
10. As described in claim 1 for a drum-type volume source calibration phantom, the drum-type container is a 55-gallon container.
11. A calibration method for drum-type volume source calibration phantom comprising steps:
providing a plurality of drum-type volume source calibration phantoms, each drum-type volume source calibration phantom having different density, and the drum-type volume source calibration phantom having a drum-type container, a plurality of plate assemblies and a plurality of source plates, and each source plate having a plurality of sources;
performing activity measurement for every drum-type volume source calibration phantom;
using the drum-type volume source calibration phantoms in a detector to obtain correlation between density and counting efficiency; and
measuring energy dependence of different sources as correction factor.
12. As described in claim 11 for the calibration method for a drum-type volume source calibration phantom, the plate can be metal and non-metal.
13. As described in claim 11 for the calibration method for a drum-type volume source calibration phantom, the non-metal can be paper, wood, plastics, cement and glass.
14. As described in claim 11 for the calibration method for a drum-type volume source calibration phantom, the source is a \u03b3 source.
15. As described in claim 14 for the calibration method for a drum-type volume source calibration phantom, the \u03b3 source can be 57cobalt, 137 cesium, 54manganese, 60cobalt or combination of either one.