ML021160136
| ML021160136 | |
| Person / Time | |
|---|---|
| Issue date: | 04/30/2002 |
| From: | Bhachu U, Jankovich J NRC/NMSS/IMNS/MSIB |
| To: | Met One Instruments |
| References | |
| Download: ML021160136 (5) | |
Text
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE (AMENDED IN ITS ENTIRETY)
NO.: NR-1124-D-102-E DATE: April 30, 2002 PAGE: 1 OF 3 DEVICE TYPE: Aerosol detector MODEL: E-BAM Beta Attenuation Mass Monitor MANUFACTURER/DISTRIBUTOR:
Met One Instruments 1600 Washington Blvd.
Grants Pass, OR 97526 SEALED SOURCE MODEL DESIGNATION:
Model No. VZ-623 Check Source ISOTOPE:
MAXIMUM ACTIVITY:
Carbon-14 75 microcuries (2.77 MBq)
LEAK TEST FREQUENCY:
Not Required PRINCIPLE USE:
(T) Other CUSTOM DEVICE: _________YES____X_____NO
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE (AMENDED IN ITS ENTIRETY)
NO.: NR-1124-D-102-E DATE: April 30, 2002 PAGE: 2 OF 3 DEVICE TYPE: Aerosol detector DESCRIPTION:
The Model E-BAM device is an automatic continuous ambient aerosol and particulate monitor which involves the measurement of the attenuation of beta rays emanating from a the 60 +/- 15 microcurie (2.22 +/- 0.55 MBq) Carbon-14 source through a roll of adhesive filter paper that has collected ambient particulate matter. This transmission of rays through matter results in reduction in the number of beta particles detected. A scintillation beta radiation detector monitors the degree of attenuation of the beta radiation emanating from the source. The magnitude of the reduction in detected beta particles is a function of the mass of the absorbed matter between the radioactive source and the detector. A microprocessor of Model E-BAM device conducts sample count integration of the ambient aerosol concentrations as a function of the degree of attenuation and corrections are made for background noise.
The source in the device is a Model VZ-623 beta source, manufactured by AEA Technology QSA, Inc. The Model VZ-623 source was subjected to the ISO-2919 tests and the manufacturer reported that the source achieved a classification of C.34242. The maximum activity of the source to be used in the Model E-BAM device is 75 µCi (2.77 Mbq). The activity level in the Model VZ-623 source is less than specified in 10 CFR 30.71, Schedule B, and therefore, no separate sealed source evaluation was conducted for the source. The Model VZ-623 source is registered hereby for use in the Model E-BAM device.
In the device, the source is mounted in a aluminum sleeve source holder. The source is held in place by a threaded tapering plug air deflector. A neoprene gasket is used between the source holder sleeve and the deflector. The joint is secured by adhesive such as Loctite 222. The source holder is housed in solid block of aluminum, called upper block assembly. The adapter nozzle and tamper proof set screws secure the source holder into the upper block. The lower aluminum block also protects the source and serves as a housing for components such as adhesive filter roll, detector and components which are not related to radiological protection.
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE (AMENDED IN ITS ENTIRETY)
NO.: NR-1124-D-102-E DATE: April 26, 2002 PAGE: 3 OF 3 DEVICE TYPE: Aerosol detector DIAGRAM: See Attachments
REFERENCES:
The following supporting documents for the Met One Instruments, Inc. Model E-BAM aerosol monitor are hereby incorporated by reference and made a part of this registry document:
Application dated November 28, 2001 (ML020320240), and March 15, 2002 (Ml20800127) with enclosures thereto.
Documents dated February 07, 2002 (ML020660398), February 14, 2002 (ML020660440), February 15, 2002 (ML020660435),
February 25, 2002 (ML020660368 and ML020800142), February 26, 2002 (ML020800193, February 27, 2002 (ML020660377),
March 04, 2002 (ML020660295), March 06, 2002 (ML020650682),
March 07, 2002 (ML020800186), and March 08, 2002 (ML020800186), and March 15, 2002 (ML020800171) with enclosures thereto.
NOTE:
The numbers in parenthesis above refer to the accession numbers in the NRC Agency-wide Documents Access and Management System (ADAMS)
ISSUING AGENCY:
U.S. Nuclear Regulatory Commission
/RA/
Date: April 30, 2002 Reviewer:____________________
Ujagar S. Bhachu
/RA/
Date: April 30, 2002 Concurrence:___________________
John P. Jankovich
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE (AMENDED IN ITS ENTIRETY)
NO.: NR-1124-D-102-E DATE: April 30, 2002 SOURCE/DETECTOR ASSEMBLY
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE (AMENDED IN ITS ENTIRETY)
NO.: NR-1124-D-102-E DATE: April 30, 2002 MOUNTED E-BAM MODEL