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Gamma Clay

Gamma Shield

Description

This shielding putty was developed as a replacement for our popular lead based shield clay. The putty is manufactured under careful controls to insure that the Bismuth is evenly distributed throughout the material, thus insuring that there will be no holes apparent to the radiation. The material is in the non-soluble form of elemental bismuth (90% by weight). Its density is 3.8 g/ cc or 238 lb/ ft3. It will not dry out and form a powder, and is supplied in convenient size chunks for shaping.

Medical Application

GammaClay can be used to protect patients during orthovoltage x-ray treatments. In this type of treatment, x-rays of several hundred kvp are used to treat localized skin cancers and similar lesions. It is desirable to protect the surface surrounding skin areas from radiation. In the past this was accomplished by cutting lead sheets or casting molten metals into special molds. EnviroClay is readily pliable, yet has enough consistency to hold it’s shape after placement. It requires no special tools or techniques to produce patient shields. This material permits accurate, reproduceable technique for obtaining small openings in shields molded to fit patients.

Features

  • Non-hardening
  • Re-usable
  • Lead free
  • Temporary gamma shielding
  • Shielding for cable tray penetrations
  • Radiographic film masking to prevent radiation scatter

Specification (click to open)

Specification

 

Composition Data Important Properties
Hydrogen atom density / cm3
3.3 x 1022
Natural isotope distribution
99.98% 1H
Bismuth atom density / cm3
9.9×1021
Weight percent bismuth
90%
Total Density
3.8 g/cm3 (238 lbs/ft3)

Radiation Properties

Macroscopic Thermal Neutron Cross Section cm-1:
0.01 cm-1
Lead Equivalent Thickness (inch):
0.39
Attenuation Factors for 1 inch
200 KeV
1.9 x 104
500 KeV
4.7
1.0 MeV
2.0
Attenuation Factors for 2 inch
Ir-192
30
Cs-137
8.4
Co-60
3.0
Gamma resistance
5×108 RAD
Neutron Resistance
2.5×1017 n/cm2

Physical Properties

Machinability:
poor
State
Putty
Colour
Gray
Odour
No significant odour

Thermal Properties

Recommended Temperature Limit:
45°C (110 °F)