A nuclear power laboratory shielding project | gamma ray protection

Boron containing polyethylene board has shown excellent performance in medical radiation shielding, and has become a core protective material for BNCT treatment, radiology, and nuclear medicine imaging scenarios due to its dual mechanism of "slowing absorption". It has multiple advantages such as shielding, lightweight, environmental safety, durability, and stability, and is the preferred solution to replace traditional lead boards and concrete.


1、 Core protection mechanism: dual interception, precise**
The neutron absorption of boron element - The boron-10 isotope in boron containing polyethylene sheets (accounting for about 20% of natural boron) has a high thermal neutron absorption cross section (3837 microns), which is 600 times that of lead. Through the nuclear reaction of 10B+n → 7Li+4He, it can convert neutrons into stable lithium-7 and helium-4 particles, completely ending the radiation chain and avoiding neutron ionization damage to matter.
The slowing effect of polyethylene matrix - Hydrogen atoms in polyethylene undergo elastic collisions with fast neutrons, reducing neutron energy from high energy (fast neutrons) to low energy (thermal neutrons), creating conditions for the absorption of boron elements. This synergistic mechanism of "slowing down first, then absorbing" enables the boron containing polyethylene board to form a three-dimensional protective system, with a shielding efficiency of over 99% (10mm thickness)
2、 Medical scenario application: full coverage from treatment to imaging
BNCT treatment (boron neutron capture therapy)
Core function: During the treatment process, scattered neutrons may damage non target tissues. Boron containing polyethylene plates absorb thermal neutrons, significantly reducing the risk of radiation leakage.
Data support: A 15cm thick board containing 15% boron carbide can reduce the neutron flux in the treatment room from 106n/cm2 ⋅ s to 102n/cm2 ⋅ s, with a shielding efficiency of 99.99%.
Structural adaptation: The density is only 1.2g/cm ³ (much lower than concrete's 2.5g/cm ³), making it easy to customize precision structures such as treatment head shields and patient positioning frames.
Radiation therapy and nuclear medicine imaging
Synchronous shielding: In equipment such as linear accelerators and PET-CT, boron containing polyethylene plates can simultaneously shield neutrons and gamma rays. For example, after the nuclear medicine department of a certain hospital adopted this material, the annual dose of medical staff decreased from 2.3mSv to 0.4mSv; In the PET-CT room, the reduction of neutron background noise increases imaging resolution by 15%.
Complex structure adaptation: supports mechanical cutting and other processes, can be quickly assembled into curved protective covers, perforated shielding plates and other shaped parts, suitable for accelerator beam pipelines, BNCT treatment chambers and other needs.
3、 Future trend: benchmark for lightweight and functional integration
With the clinical promotion of BNCT technology in countries such as China and Japan, boron containing polyethylene sheets are accelerating their penetration from the nuclear industry to the medical field. Its core advantages lie in:


Performance optimization: By improving the preparation process (such as hot pressing) and optimizing the boron content (5% -80% customizable), the shielding efficiency and mechanical strength can be further improved.
Green and environmentally friendly: using non-toxic polyethylene matrix, supporting recycling, and complying with medical green safety standards.
Diversified applications: In addition to the medical field, it can also be expanded to aerospace (cosmic ray protection), scientific research testing (neutron spectrometer protection) and other scenarios.
Conclusion: The ideal choice for medical radiation protection
Boron containing polyethylene sheet has become a benchmark material in the field of medical radiation protection due to its core advantages of "* * shielding+lightweight+environmental safety". Whether it is BNCT therapy, radiology imaging, or nuclear medicine equipment protection, it can provide reliable safety barriers while reducing installation costs and improving operational flexibility. With the continuous advancement of technology, its application prospects will become even broader.