nTOF air and concrete activation

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Transcription de la présentation:

nTOF air and concrete activation Extrapolation of Measurements of 2001 runs show Air activation: (1 pulse/supercycle 7.1012) 7Be: 230Bq/m3 (limit 330 Bq/m3) Risks: pollution of environmental air and exceeding legal limits. Concrete activation: 22NA (t1/2 =2.6 years and soluble in water) : 192Bq/g (limit d’exemption 3Bq/g) Risks: pollution of earth and water and creation of nuclear waste. . AIR: Renouvellement de l’air 5x par jour.(base sur mesures de 41Ar (t1/2=1.83h) Mesure 70metres apres la cible 33 heures plus tard plus d’activite de 7Be Beton activation Estimation du flux de particules secondaires par 1) Conversion de la dose en flux de la chambre a ionisation PMIBL02 11m apres la cible , 2) par activation du cuivre pres de la chambr a ionisation PMIBL02 3) par l’activation du nylon. PSMB 11.02.2002 G.D.

nTOF air and concrete activation Actions: 2 meetings nTOF, TIS-RP and PS Decisions: Simulations: shows the same values as the measured ones build a shielding round the drift tube of 2mx2.4mx14.4m. Expected gain a factor 10 for 7Be.(=10x below legal authorised limit, but 103 to 104 higher than natural level) Surveillance of the site level when beam to nTOF. Door 203 will be moved Probleme du shielding juste apres le blockhouse (200microSv/h) Ou s’echappe l’air? Mesure contre le grillage a la hauteur des ISR pour mieux comprendre la concentration de 7Be dans l’air. PSMB 11.02.2002 G.D.