Method and system for calorimetry probe
Radiotherapy is one of the most effective treatments for cancer and its success depends critically on accurate targeting and delivery of the correct radiation dose. Accurate dosimetry is therefore essential to maintain and improve patient survival rates. However, size and long wait times currently limit water and graphite based calorimeters to standards laboratories leaving field-based dosimetry to ionization chamber measurements which depend upon a reference field-specified calibration factor. It would therefore be beneficial to provide radiotherapy equipment operators a direct approach of clinical reference dosimetry wherein the dosimeter provides increased independence on dose, dose rate, radiation energy, and energy type, etc. It would be further beneficial for such novel clinical dosimeters to be compact, function as secondary standards used routinely for measurements and allow radiotherapy doses to be measured directly and in an absolute manner. According to embodiments of the invention novel compact graphite probe calorimeters are provided.
1. A calorimeter comprising:
at least one core;
a jacket surrounding the at least one core to provide thermal isolation of the at least one core from the ambient environment;
a first thermal barrier comprising an aero-gel based material disposed between the at least one core and the jacket; and
a temperature sensing element thermally coupled to the at least one core.
2. The calorimeter according to claim 1 , wherein the calorimeter has a single core with a diameter of approximately 6 mm.
3. The calorimeter according to claim 1 , wherein the calorimeter has a single core with a volume of approximately 0.3 cm 3 .
4. The calorimeter according to claim 1 further comprising a shield surrounding the jacket, wherein the shield has an outer boundary that encloses a volume of approximately 2.2 cm 3 .
5. The calorimeter according to claim 1 , wherein the core, the jacket and the first thermal barrier together have a volume of approximately 0.6 cm 3 .
6. The calorimeter according to claim 1 comprising a plurality of cores, wherein the jacket surrounds the plurality of cores and a temperature sensing element is thermally coupled to each of the cores.
7. The calorimeter according to claim 6 , wherein the plurality of cores are vertically disposed within the jacket.
8. The calorimeter according to claim 6 , wherein the plurality of cores are horizontally disposed within the jacket.
9. The calorimeter according to claim 1 , further comprising a wireless interface configured to transfer dose data from the calorimeter to a microprocessor.