Critical Mass

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Related to Critical level: Critical region, critical point, Critical value
Radiation safety The minimum amount of material—mass of a particular radioisotope—required for it to reach ‘criticality’ and undergo a spontaneous fission chain reaction, releasing a lethal shower of neutron and gamma radiation
Research A popular term for the minimum number of persons working in related fields in a particular place, below which creative thinking and interaction may be suboptimal
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
References in periodicals archive ?
[A.sub.i] is the result of the soil analysis for each nutrient and [NCRIz.sub.i] the estimated critical level of the soil attribute i.
Four of the country's nine dams reached their critical levels, while the rest were near critical levels in six days since Egay began as a low pressure area in the southern Philippines on Tuesday, said Undersecretary Benito Ramos of the National Disaster Risk Reduction and Management Council (NDRRMC).
WHY are we not surprised that prison over-crowding is now at a critical level?
But what Mr Darling should really do is to allow the stock to fall further; until at a critical level he should give the money that would be spent bailing out reckless shareholders to the workers of the company, allowing them to buyout the business.
Maintaining a critical level in terms of cost and resources is high and experts have said the UK cannot sustain it for more than a few days.
When the bacteria count in the meat reaches a critical level, the orange turns to grey to match the smaller Q on the label.
Although this book is suggested for young children, it also can be read on a critical level for political discussions.
The NHS has been warned that stocks of a common painkiller used by thousands of patients may reach a 'critical level' within weeks.
Anderson said "the critical level is about 26 million s/f of potential (commercial) development." The total plan is 40 million s/f, which includes residential development.
Data from our previous work was included in the more recent paper because we needed "boundary values" between or below which we were looking for a threshold or a critical level. This was a long-term study, and it would have been an inappropriate use of animals to repeat the earlier animal studies for those groups.
However, none of these goals can be realized without a critical level of reading skill, which is really the key to the success of CBI ESL.
The researchers also analyzed cells from patients who had not yet experienced an OI, and discovered that these patients did not get an OI within 4 months of follow-up unless their CD4 T cell count dropped to fewer than 250 cells/mm (3) and IFN-[alpha] production decreased to less than 300 IU/mL, a value subsequently determined to be a critical level for preventing an OI.

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