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US 2014/0278261 A1Published application
Algorithm for Wireless, Motion and Position-Sensing, Integrating Radiation Sensor Occupational and Environmental Dosimetry
AssigneeLandauer, Inc.
InventorsP. Alexander WALEROW, Mark R. SALASKY, Daniel J. VALENTINO, Brahim MORENO, Marc MILLION
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Abstract
Described is an apparatus, method and machine-readable medium for determining radiation dosages based on a solution vector for each radiation field and an objective function.
Claims49
An apparatus comprising:
- one or more processors, and
- a machine-readable medium for storing instructions thereon which when executed by the one or more processors cause the one or more processors to perform operations comprising the following steps:
- (a) determining radiation dose values for a response matrix by determining a radiation dose value for each radiation field in a response matrix from a plurality of detector elements of a dosimeter,
- (b) determining a final net radiation dose value for each radiation field in the response matrix, and
- (c) displaying the final net radiation dose value for each radiation field in the response matrix to a user and/or saving the final net radiation dose value for each radiation field to a first storage medium,
- wherein each radiation field has a radiation source,
- wherein step (b) comprises conducting a numerical optimization process comprising the following steps:
- (i) generating an initial solution vector for each radiation field,
- (ii) iteratively updating the initial solution vector for each radiation field until an objective function is minimized to thereby generate an optimal solution vector, and
- (iii) determining a radiation dose value for each radiation field based on the optimal solution vector for the source,
- wherein the objective function is
- s
- j
- =
- ∑
- i
- =
- 1
- 4
-
- (
- G
- ij
- -
- G
- _
- j
- σ
- ij
-
- G
- _
- j
- )
- 2
- where i is the number of detector elements of the dosimeter,
- where j is the number of radiation fields,
- where Gj is are expected values of one or more dose conversion factors for radiation field j,
- where Gij is the dose computed for the ith element of the dosimeter and the jth radiation field, and
- where σij is a total uncertainty of a stored response for the ith detector element of the dosimeter and jth radiation field, and
- wherein each stored response is one of a plurality of stored responses stored on a second storage medium.
38 more elements
A machine-readable medium having stored thereon sequences of instructions, which when executed by one or more processors, cause one or more electronic devices to perform a set of operations comprising the following steps:
- (a) determining radiation dose values for a response matrix by determining a radiation dose value for each radiation field in a response matrix from a plurality of detector elements of a dosimeter,
- (b) determining a final net radiation dose value for each radiation field in the response matrix, and
- (c) displaying the final net radiation dose value for each radiation field in the response matrix to a user and/or saving the final net radiation dose value for each radiation field to a first storage medium,
- wherein each radiation field has a radiation source,
- wherein step (b) comprises conducting a numerical optimization process comprising the following steps:
- (i) generating an initial solution vector for each radiation field,
- (ii) iteratively updating the initial solution vector for each radiation field until an objective function is minimized to thereby generate an optimal solution vector, and
- (iii) determining a radiation dose value for each radiation field based on the optimal solution vector for the source,
- wherein the objective function is
- s
- j
- =
- ∑
- i
- =
- 1
- 4
-
- (
- G
- ij
- -
- G
- _
- j
- σ
- ij
-
- G
- _
- j
- )
- 2
- where i is the number of detector elements of the dosimeter,
- where j is the number of radiation fields,
- where Gj is are expected values of one or more dose conversion factors for radiation field j,
- where Gij is the dose computed for the ith element of the dosimeter and the jth radiation field, and
- where σij is a total uncertainty of a stored response for the ith detector element of the dosimeter and jth radiation field, and
- wherein each stored response is one of a plurality of stored responses stored on a second storage medium.
36 more elements
A method comprising the following steps:
- (a) determining radiation dose values for a response matrix by determining a radiation dose value for each radiation field in a response matrix from a plurality of detector elements of a dosimeter,
- (b) determining a final net radiation dose value for each radiation field in the response matrix, and
- (c) displaying the final net radiation dose value for each radiation field in the response matrix to a user and/or saving the final net radiation dose value for each radiation field to a first storage medium,
- wherein each radiation field has a radiation source,
- wherein step (b) comprises conducting a numerical optimization process comprising the following steps:
- (i) generating an initial solution vector for each radiation field,
- (ii) iteratively updating the initial solution vector for each radiation field until an objective function is minimized to thereby generate an optimal solution vector, and
- (iii) determining a radiation dose value for each radiation field based on the optimal solution vector for the source,
- wherein the objective function is
- s
- j
- =
- ∑
- i
- =
- 1
- 4
-
- (
- G
- ij
- -
- G
- _
- j
- σ
- ij
-
- G
- _
- j
- )
- 2
- where i is the number of detector elements of the dosimeter,
- where j is the number of radiation fields,
- where Gj is are expected values of one or more dose conversion factors for radiation field j,
- where Gij is the dose computed for the ith element of the dosimeter and the jth radiation field, and
- where σij is a total uncertainty of a stored response for the ith detector element of the dosimeter and jth radiation field, and
- wherein each stored response is one of a plurality of stored responses stored on a second storage medium.
36 more elements
-96. (canceled)
Dependencies are inferred from the claim text.