The transportability of the instrument allows the user to move the calorimeter to the

measurement site and thus limits the need to move special nuclear material. At the same

time, instrument transportability does not compromise measurement accuracy. The de-

sign has application to a wide range of measurement requirements including international

safeguards measurements, shipper-receiver difference measurements, in-plant accoun-

tancy measurements and anomaly resolution in passive neutron coincidence counting or

segmented gamma-ray scanning. The instrument also has a role in replacing a proportion

of destructive assay.

The modular transportable design facilitates installation, maintenance and the use of the

instrument in a variety of measurement applications. In the standard configuration, the

calorimeter is capable of measuring plutonium bearing samples which can be contained

in a cylindrical canister with internal dimensions 190.5mm (7.70in) in diameter and

355.6mm (14.0in) high. The calorimeter has a variable sample power measurement

range from below 0.025 to 20 watts and an operating temperature range from 20 to 50 c.

Variations to the standard design for different requirements and for special sample types

or sample packaging can be accommodated. In particular the measurement chamber vol-

ume may be reduced or increased in size and measurement precision and measurement

time may be optimised for a specific limited sample power range. Smaller sample di-

ameter custom systems achieve significantly better precision and accuracy at lower meas-

urement powers (e g. <10mW).

Thermal power measurement accu-

Instrument footprint 123cm x 69cm x

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racy better than 0.5% over the operat-

147cm (L xW xH), overall height of

ing range and better that 0.2% at 1.0

the removable hoist is 187cm

Watts power (7.5" diameter sample)

Weight of trolley mounted version is

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Variable Measurement Chambers op-

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approximately 300kG

erating temperature range from 20C

Power consumption 300-600 watts

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to 50C

Measurement range from 20mW to 50

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Measurements approved for use by

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IAEA and WIPP