Dose Calculation Device Using V/I Conversion for Radiation Drift
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Solution Overview
Problem
In facilities where radiation dose is high and access is difficult, existing detection devices struggle to accurately and frequently provide radiation dose information, requiring a solution that enhances data acquisition without adding new devices and maintains simplicity and durability.
Innovation Solution
A dose calculation device integrated with a measurement device, utilizing a V/I conversion element, memory, correlation storage, evaluators, and a comparator to estimate cumulative radiation dose based on zero point current and span shift data, allowing for accurate radiation dose calculation without additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a detection device is installed in a radioactively contaminated facility, then radiation dose information can be acquired, but the device requires frequent exchange and repair due to radiation exposure
Solution Approach 1:
The patent performs preliminary calibration actions by storing zero point current and span shift data before the device is deployed to the radioactive facility. This allows the device to self-correct radiation-induced drift without requiring frequent on-site calibration or replacement, thereby extending device durability and reducing replacement time.
Solution Approach 2:
The patent changes the operational parameters by converting the detected physical quantity from voltage to current using a V/I conversion element. Current transmission is less susceptible to radiation-induced noise and drift, allowing the device to maintain accuracy for longer periods in radioactive environments, thus improving reliability and reducing replacement frequency.
2Measurement precision
If calibration is performed frequently to maintain accuracy, then measurement precision is improved, but device complexity and maintenance burden increase
Solution Approach 1:
The patent implements a self-service calibration system where the detection device automatically performs calibration by comparing its output against stored zero point current and span shift data. The microprocessor automatically calculates correction factors and adjusts measurements, eliminating the need for manual calibration operations and reducing maintenance burden while maintaining high measurement precision.
Solution Approach 2:
The patent incorporates feedback mechanisms where the device continuously monitors its own output and compares it against the stored calibration data. When drift is detected, the system automatically applies correction based on the stored zero point and span information, maintaining measurement precision without requiring external calibration interventions.
3Device complexity
If the detection device transmits voltage signals, then the transmission is simple, but noise influence increases with transmission distance
Solution Approach 1:
The patent replaces the voltage-based transmission system with a current-based transmission system using a V/I conversion element. Current signals are inherently more resistant to noise and signal degradation over long transmission distances, improving signal accuracy and reliability without significantly increasing system complexity.
Data Source
AI summary
A dose calculation device 50 includes: a detector 20 detecting a physical quantity as voltage; a V/I conversion element 28 converting the quantity into current; a memory 51 storing a zero point current and a shift amount from a true value caused by radiation; a correlation storage 52 storing zero point shift data in correlation between the zero point current and cumulative dose and span shift data in correlation between the cumulative dose and the shift; a first evaluator 53 estimating cumulative dose of the V/I conversion element 28 based on the zero point current and the zero point shift; a second evaluator 54 estimating cumulative dose of the V/I conversion element 28 based on the shift and the span shift; and a comparator 56 specifying a common cumulative dose as a true cumulative dose by comparing cumulative doses estimated by the first evaluator 53 and the second evaluator 54.