Bertin Technologies ALPHAGUARD DF2000 - 16 Calibration Scheme of Alphaguard

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USER MANUAL
16 CALIBRATION SCHEME OF ALPHAGUARD
The AlphaGUARD is traceable to national activity standards. The following Figure
gives an overview of the traceability:
The correctness of the radon concentration values measured with AlphaGUARD
monitors are assured through a multiple reference of the instrument calibration to
recognized calibration standards.
Rn-222
(Bi-214)
Ra
-
226
(Bi-214)
Accumulation
vessel
one-way use
Glass bulb
filled with Rn-
222 in
London.
Activity
specified by
NPS.
repeated use
Gamma
spectroscopic
cross
-
calibration. PTB
radium source
versus Radon
sealed in glass
ampoule.
PTB
NIST (USA)
NPL (GB)
PTB (GER)
Accumulation
vessel
repeated use
PE capsule,
filled with Ra
-
226 solution.
Activity and
emanation
fraction
specified by
NI
ST.
Radon:
2 000 Bq/m³
60 pCi/l
Radon:
30 000 Bq/m³
800 pCi/l
Radon:
600 000 Bq/m³
16 000 pCi/l
Frankfurt Radon
chamber:
Radon to be blown
out inside the
calibration chamber
(remote controlled)
Frankfurt Radon
chamber:
Radon to be blown
out inside the
calibration chamber
(remote controlled)
Frankfurt Radon
chamber:
Radon to be released
by breaking the glass
ampoule inside the
chamber
(remote controlled)
γ