1. In a radiological measurement system including:
a radiation detector formed of semiconductor crystal;
a high voltage DC supply for applying a bias voltage to the radiation detector;
a controller provided between the radiation detector and the high voltage DC supply to exercise on-off control on the bias voltage supplied from the high voltage DC supply;
an amplifier for amplifying a detected signal supplied from the radiation detector; and
a protection circuit provided between the radiation detector and the amplifier to protect the amplifier from a surge current generated when the bias voltage is subjected to the on-off control,
the radiological measurement system comprising:
a control unit for preventing the surge current from flowing to the amplifier; and
a switch provided in parallel with the protection circuit and controlled in operation state by the control unit,
wherein
the control unit controls the operation state of the switch in synchronism with the on-off control exercised by the control unit to prevent the surge current from flowing to the amplifier.
2. The radiological measurement system according to claim 1, wherein
at time of off-control of the bias voltage, the control unit exercises control so as to bring the switch into an on-state and then exercises off-control on the bias voltage, and
at time of on-control of the bias voltage, the control unit exercises control so as to exercise on-control on the bias voltage and then bring the switch into an off-state.
3. A radiological imaging system comprising a radiological measurement system according to claim 2.
4. A radiological imaging system according to claim 3, wherein the semiconductor crystal comprises cadmium telluride.
5. A radiological imaging system comprising a radiological measurement system according to claim 1.
6. A radiological imaging system according to claim 5, wherein the semiconductor crystal comprises cadmium telluride.
7. In a radiological measurement system including:
a radiation detector formed of semiconductor crystal;
a high voltage DC supply for applying a bias voltage to the radiation detector;
a controller provided between the radiation detector and the high voltage DC supply to exercise on-off control on the bias voltage supplied from the high voltage DC supply;
an amplifier for amplifying a detected signal supplied from the radiation detector; and
a protection circuit provided between the radiation detector and the amplifier to protect the amplifier from a surge current generated when the bias voltage is subjected to the on-off control,
the radiological measurement system comprising:
a control unit for preventing the surge current from flowing to the amplifier; and
a voltage regulator circuit provided so as to be able to be electrically connected to an input side of the amplifier to apply a constant voltage to the amplifier at time of connection,
wherein
the control unit controls an electric connection state between the voltage regulator circuit and the amplifier in synchronism with the on-off control exercised by the control unit to prevent the surge current from flowing to the amplifier.
8. The radiological measurement system according to claim 7, wherein
at time of off-control of the bias voltage, the control unit exercises control so as to bring the voltage regulator and the amplifier into a connection state and then exercises off-control on the bias voltage, and
at time of on-control of the bias voltage, the control unit exercises control so as to exercise on-control on the bias voltage and then bring the voltage regulator and the amplifier into a disconnection state.
9. A radiological imaging system comprising a radiological measurement system according to claim 8.
10. A radiological imaging system according to claim 9, wherein the semiconductor crystal comprises cadmium telluride.
11. A radiological imaging system comprising a radiological measurement system according to claim 7.
12. A radiological imaging system according to claim 11, wherein the semiconductor crystal comprises cadmium telluride.
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 storage system, comprising:
an outer casing having an evacuated inner volume;
a vessel for storage located within the outer casing and having a plurality of protrusions distributed on an outer surface thereof; and
a plurality of filamentary strands spanning the inner volume,
wherein at least some of the plurality of protrusions are essentially tangentially contacted by the plurality of the filamentary strands to secure the vessel in six degrees of freedom relative to the outer casing, and
wherein the filamentary strands have a thermal throughput from the vessel to the outer casing being no greater than 5 mWliter of liquid nitrogen.
2. The storage system according to claim 1, wherein the filamentary strands are in tension.
3. The storage system according to claim 1, wherein the filamentary strands are formed from at least one of Kevlar and Basalt fiber.
4. The storage system according to claim 1, wherein the filamentary strands have a cross section that allows to decrease thermal conduction between the outer casing and the vessel.
5. A thermal insulation device, comprising:
an outer shell exposed to an exterior area;
a storage container located inside the outer shell;
a substantially vacuumized area between the outer shell and the storage container; and
suspended filamentary strands located inside the vacuumized area, each filamentary strand having a first end and second end,
wherein the first end and the second end of each filamentary strand is attached to an inner side of the outer shell to be suspended so that each filamentary strand holds the storage container at a position, and
wherein the filamentary strands have a thermal throughput from the vessel to the outer casing being no greater than 5 mWliter of liquid nitrogen.
6. The thermal insulation device according to claim 5, further comprising:
protrusions attached to an outer surface of the storage container, wherein each filamentary strand engages with a corresponding protrusion for holding the storage container.
7. The thermal insulation device according to claim 5, wherein
each of the filamentary strands does not contact an outer surface of the storage container.