Borated Flex-Panel


JC227ATH Borated Flexi-Panel is an improved version of the discontinued JC227A.

JC227ATH Borated Flexi-Panel is typically used for shielding neutrons such as those produced by high-energy accelerators used in physics research and fusion test facilities.  Neutrons not shielded can produce high energy capture gammas by activating components of the concrete and other structural elements.

JC227ATH is a flexible light-weight sheet material with a relatively high boron content of 9% 

(natural isotopic distribution). JC227ATH also includes a hydrogenous additive that helps slow the fast neutrons and can reduce the overall radiation field. 

It is a relatively inexpensive neutron shielding material and is available in standard flexible sheets 8mm x 1219mm x 1219mm (5/16″ thick x 48″ x 48”) or in custom sizes. The strong, rubber-like material is self-extinguishing when exposed to flame.  Each sheet weighs approximately 14.5 kg (32lbs) and is easily handled and installed by non-specialised personnel.  This material can be cut to size using a razor knife and can be bent in a radius as small as 12.7mm (1/2″), depending on the thickness. 

JC227ATH is easily attached to concrete or other wall materials using standard mounting techniques.

  • Inexpensive flexible neutron shielding material
  • Highly flexible neutron shielding material ideal for installation on walls or in doors
  • Contains 9% boron along with hydrogen in a tough flexible elastomer
  • Easily handled & installed by non-specialised personnel
  • Neutron Shielding for Mixed Energy Neutron Sources
  • Medical Radiation Shielding & Particle Accelerators
Flexible Neutron Shielding
Flexible Neutron Shielding

Shielding Effectiveness For Various Types of Radiation:

  • Thermal Neutrons – Excellent
  • Fast Neutrons – Fair
  • Gammas – Fair
  • Capture Gammas – Excellent

Temperature Limit: 180°F (82.2 °C)

Machinability: Cuts easily with razor blade knife or saw

Forms and Sizes of Shielding: 

  • Flexible Sheets – 48″ x 48″ x 5/16″ thick, custom sizes available.
  • Each sheet weighs approx. 31.5 lbs (14.3 Kg)
  • Bend radius as small as a 1/2″

Radiation Resistance (structural and shielding integrity):

  • Accumulated Gamma Radiation Exposure Limit: 1.0 x 109 Rad
  • Accumulated Neutron Radiation Exposure Limit: 5.0 x 1017 n / cm²

Density: 1.2 gram / cm³ (76 pounds / cubic foot)

Thermal Neutron One-Tenth Thickness: 0.19 inch – Thickness of JC227ATH required to reduce the incident flux of thermal neutrons by a factor of 10 (exit thermal flux is 10% of incident thermal flux)



Composition Data 227ATH
Hydrogen atom density/cm³: 3.23 x 10²²
Hydrogen weight percent: 4.44%
Boron atom density/cm³: 6.28 x 10²¹
Boron natural isotope distribution: 19.6% ¹⁰B & 80.4% ¹¹B
Boron weight percent: 9.26%
Total density: 1.22 g/cm³ (76 lbs / ft³)
Radiation Properties
Thermal Neutron 1/10 thickness: 0.2”
Gamma maximum exposure: 10 x 10⁸ rad
Neutron maximum exposure: 5.0 x 10¹⁷ n/cm²
Physical Properties
State: Rubbery Solid
Odour: Mild odour
Colour: Grey/black speckled
Machinability: Poor, but easy to cut
Thermal Properties
Recommended Temperature Limit: 180 °F
Chemical Properties
Chemical Name & Synonyms: Borated Polyurethane
Trade Name & Synonyms: JC227ATH
Chemical Family: Polyurethane plus Boron compound
Solubility in Water: Negligible
Nominal Elemental Analysis  % by Weight No Atoms / CC
Hydrogen 4.44 3.23 x 10²²
Boron 9.26 6.28 x 10²¹
Carbon 37.13 2.27 x 10²²
Nitrogen 6.71 3.51 x 10²¹
Oxygen 32.65 1.50 x 10²¹
Sodium 0.06 2.00 x 10¹⁹
Silicon 0.02 4.91 x 10¹⁸
Aluminium 9.63 2.62 x 10²²
Iron 0.06 7.52 x 10¹⁸
Density 1.22 gram/cm³

Thickness of JC227ATH required to reduce to thermal 90% of an incident neutron flux, as a function of initial neutron energy (exit epithermal flux is 10% of incident neutron flux)

Thickness of JC227ATH required to reduce incident flux of thermal neutrons by a factor of 10 (exit thermal flux is 10% of incident thermal flux)

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