Electron Beam Molybdenum-99 Production
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Solution Overview
Problem
The global supply of molybdenum-99 (99Mo) is uncertain due to the aging of nuclear reactors used for its production, leading to shortages and unreliable medical diagnostic testing, as existing methods for producing 99Mo from molybdenum-100 (100Mo) are inefficient and prone to producing unwanted isotopes.
Innovation Solution
A high-power electron linear accelerator system is used to irradiate molybdenum-100 targets with bremsstrahlung photons, producing 99Mo through a photo-nuclear reaction, with separate cooling systems and shielding to maximize yield and minimize the production of undesirable isotopes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nuclear reactors are used to produce molybdenum-99, then production has been reliable in the past, but the aging reactors lead to uncertain supply and shortages
Solution Approach 1:
The patent changes the fundamental production parameter from nuclear fission (reactor-based) to photo-nuclear reaction (electron beam-based). This parameter change enables a completely different production methodology that avoids the aging reactor problem and establishes a new reliable production approach using linear accelerators to generate electron beams that irradiate molybdenum-100 targets.
2Productivity
If conventional methods are used to produce molybdenum-99 from molybdenum-100, then production is possible, but the methods are inefficient and produce unwanted isotopes
Solution Approach 1:
The patent applies parameter changes by using high-energy electron beams (specifically 30-50 MeV) to induce photo-nuclear reactions in molybdenum-100 targets. This energy parameter range is optimized to maximize the production of molybdenum-99 while minimizing the generation of unwanted isotopes, achieving both high efficiency and selective production.
Solution Approach 2:
The patent replaces conventional thermal neutron irradiation methods with a photo-nuclear reaction system using electron beams. This substitution of the irradiation mechanism (from thermal neutrons to high-energy photons generated by electron beams) fundamentally improves production efficiency and isotopic selectivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method provides a reliable and efficient production of 99Mo with reduced risks of producing other isotopes, enhancing the global supply and ensuring consistent medical diagnostic capabilities.
Implementation Method 1
high-power electron linear accelerators to irradiate molybdenum-100 targets with bremsstrahlung photons
Implementation Method 2
producing 99Mo through a photo-nuclear reaction
Data Source
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AI summary
An apparatus for producing 99Mo from a plurality of 100Mo targets through a photo-nuclear reaction on the 100Mo targets. The apparatus comprises (i) an electron linear accelerator component; (ii) an energy converter component capable of receiving the electron beam and producing therefrom a shower of bremsstrahlung photons; (iii) a target irradiation component for receiving the shower of bremsstrahlung photons for irradiation of a target holder mounted and positioned therein. The target holder houses a plurality of 100Mo target discs. The apparatus additionally comprises (iv) a target holder transfer and recovery component for receiving, manipulating and conveying the target holder by remote control; (v) a first cooling system sealingly engaged with the energy converter component for circulation of a coolant fluid therethrough; and (vi) a second cooling system sealingly engaged with the target irradiation component for circulation of a coolant fluid therethrough.