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THRESHOLD PROBABILITY [4 records]

Record 1 - external organization data 2011-10-13

English

Subject field(s)
  • Radiological Physics (Theory and Application)
  • Radiation Protection
  • Compartment - Canadian Nuclear Safety Commission
DEF

stochastic effects : Biological effects that may occur at random amongst an exposed group of people, with the probability of occurrence being proportional to the effective dose equivalent, usually without a threshold...

CONT

... cancer and inheritable injury are the stochastic effects of primary concern.

French

Domaine(s)
  • Physique radiologique et applications
  • Radioprotection
  • Tiroir - Commission canadienne de sûreté nucléaire
DEF

effets stochastiques : Effets biologiques qui peuvent se produire au hasard dans un groupe de personnes exposées, et dont la probabilité de manifestation est proportionnelle à l'équivalent de dose [efficace], en général sans seuil [...]

CONT

[...] les cancers et les lésions ou maladies héréditaires sont les effets stochastiques les plus importants.

Spanish

Save record 1

Record 2 2001-01-09

English

Subject field(s)
  • Air Pollution
CONT

Evaluation of a "no effect" threshold or an "acceptable effects" threshold will have to take into consideration a probability distribution for the conjunction of sensitive life stages with unusual acid-flushing events which may have a periodicity of one per decade.

Key term(s)
  • no-effect threshold

French

Domaine(s)
  • Pollution de l'air

Spanish

Save record 2

Record 3 1996-05-13

English

Subject field(s)
  • Radiation Protection
  • Nuclear Waste Materials
CONT

Biological effects of ionizing radiation. ... at the upper end of the scale, there is no radiation exposure so high it will guarantee that every exposed individual will suffer the effect. Nor at the lower end is any exposure so low that it will carry no risk to anyone of inducing the effect. These radiation effects are therefore said to have "no threshold." Logically, it follows that any exposure to radiation, no matter how small, carries some risk and that any reduction in exposure, even from an already very low level, confers some benefit. However, it is not always appreciated that the absence of a "safe" threshold is a theoretical assumption and a safety precaution rather than something that can be proven. It is also not well understood that the toxic effects of radiation, for which there is no defined safe level, may not differ fundamentally from those of some chemical toxins for which a "safe" level in the body or in the environment has been declared.

CONT

Complicating the problem of public perceptions of the level of risk associated with radioactive wastes is the confusion induced by two fundamental principles of radio-biological and radiation protection theory. The first is the "no-threshold" hypothesis, and the second is the "as low as reasonably achievable, "or ALARA, principle. The first principle holds that there is no threshold below which exposure to radiation is entirely safe. The "no threshold" hypothesis-that any exposure to ionizing radiation, no matter how small, will increase the probability of a harmful consequence to an exposed individual-is an important scientific concept.... it is generally agreed that it is wise to err on the side of safety and work from the assumption that there is no safe level.

French

Domaine(s)
  • Radioprotection
  • Déchets nucléaires
OBS

Voir aussi le terme anglais «threshold limit value».

Spanish

Campo(s) temático(s)
  • Protección contra la radiación
  • Desechos nucleares
Save record 3

Record 4 1985-05-30

English

Subject field(s)
  • Air Pollution
CONT

Evaluation of a "no effect" threshold or an "acceptable effects" threshold will have to take into consideration a probability distribution for the conjunction of sensitive life stages with unusual acid-flushing events which may have a periodicity of once per decade.

French

Domaine(s)
  • Pollution de l'air

Spanish

Save record 4

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