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Harwell Science and Innovation Campus
DIDCOT, Oxfordshire
OX11 0TA
United Kingdom
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Fax:+44 (0)1235 436313
E-mail: Harwell Dosimeters
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Alanine Specification
Harwell RadSpin®
Harwell RadSpin® Dosimeters for the measurement of radiation dose.
When pellets containing the amino acid alanine are irradiated, stable free radicals are produced in a concentration which depends on the exposure. The measured response to microwaves of the pellet placed in the magnetic field of a paramagnetic resonance spectrometer, is quantitatively related to the radiation dose which the pellet absorbed.
Form
White cylindrical pellets of alanine in a wax binder.
Material
Active amino acid L-alpha alanine 90.9%
Binder paraffin wax 9.1%
Dimensions
Diameter 4.825mm ± 0.01 mm
(5mm to special order)
Height 2.8mm ± 0.1 mm
Mass overall 60mg ± 2mg
within a lot ± 0.6mg
standard deviation 0.3mg
Measurement reproducibility
Mass CV 0.5%
Response CV 0.5% (NPL irradiated, not packed)
Dose range
Standard range 100 Gy to 70 kGy
10 Gy to 100 kGy may be achieved
Performance
Each batch is verified by NPL comparison
Packaging
Two formats