Borated Flex-Panel | John Caunt

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

The standard thickness has been increased to 5/16” (0.31”), which provides the same amount of hydrogen, but improved thermal neutron attenuation and gamma attenuation over the standard thickness JC227A. It has more than twice the thermal neutron stopping power as that typical of 5% borated poly and is used in a wide range of mixed energy neutron shields.

It is effective in a variety of neutron shielding applications including high-energy accelerators (physics research) and neutron test facilities.

It is an inexpensive neutron shielding material and is available in flexible sheets 0.31” thick x 48” x 48” (7 x 1219 x 1219 mm). The strong, rubber-like material is self-extinguishing when exposed to flame. Each sheet weighs only 31.5-lbs (14.3 kg) and is easily handled and installed by non-specialized personnel. This material cuts easily with razor blade knife or saw and can be bent to a radius as small as 1/2” (12.7mm). JC227ATH is easily attached to concrete or other wall materials using standard mounting techniques.

Features at a glance

Inexpensive flexible neutron shielding material
Ideal for installation on walls or in doors
Contains 9.26% boron along with hydrogen in a tough flexible elastomer
Easily handled & installed by non-specialised personnel

Uses

Neutron Shielding for Mixed Energy Neutron Sources
Medical Radiation Shielding & Particle Accelerators

Properties

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)

Specifications

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

Neutron Moderation Characteristics

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)

Gamma Attenuation Characteristics

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)