MODIFICATION
66 -- Various Laboratory Equipment & Instruments
- Notice Date
- 6/1/2007
- Notice Type
- Modification
- Contracting Office
- Environmental Protection Agency, Administrative Contract Service Center, 1200 Pennsylvania Avenue, Nw, Washington, DC 20460
- ZIP Code
- 20460
- Solicitation Number
- RFQ-DC-07-00206
- Response Due
- 6/6/2007
- Archive Date
- 7/6/2007
- Description
- NAICS Code: 334519 The purpose of this modification is to provide answers to technical questions received. Question # 1: Regarding Item 3: What efficiency is expected at a useful energy rante of atleast 46 keV? Answer # 1: EPA would consider 46 keV to be in the "useful energy range" for this nominal detector size if the aboslute efficiency at 46 keV for a 2" filter paper placed directly on the detector end cap is not less than .015 (1.5%), and .003 (0.3%) for one liter of liquid in a Marinelli beaker. Question # 2: Regarding Item 3: Would it be possible to obtain manufacturer, model, and a cross sectional drawing of the existing shield that is in use in order to ensure that the proper cryostat is offered to fit the existing shield? You state that this detector is to be used with an existing dewar, is this correct? Does this mean that the contractor should not supply a dewar with the new detector? Answer # 2: This detector is a replacement for an aging detector that is beyond economical repair, therefore no dewar is required. Drawings for the existing shield and dewar are not available. The cylindrical shield was manufactured by Quantum Technologies and has inner dimensions of 12" diameter by 16" high, with a swing-open door on top for sample placement. The base of the shield is supported 29.5" above floor level and is 3.5" thick, which places the bottom of the inner cavity at 33" above floor level. The bottom opening is 3" in diameter. The dewar is 24" high with a 1" thick rubber collar on top, and supported on a shock-absorbing jack stand that is adjustable from 1.5" to 6.5" above floor level. Question # 3: Regarding Item 5: EPA specifically requests a coaxial detector to be provided for this section. May the contractor propose a different type detector that will provide a better detector geometry? Is EPA aware that a detector of this size uses a 4 inch diameter end cap? Answer # 3: EPA is aware that a detector crystal of the dimensions specified will requre a large end cap. EPA included separate statements of intended use, functional requirements, and specifications believed to be necessary to meet the functional requirements, to encourage proposals for equipment that EPA may not be famialr with through the conducted market research. As stated in the combined synopsis/solicitation, EPA will consider exceptions to the specifications if the proposal describes how the equipment will meet the functional requirements. The specification requirement for ratio of crystal diamter to thichness of 2.25 is believed by EPA to be the minimum necessary, but the relative placement of the contacts and whether the detector is classified as planar or coaxial are not important.
- Record
- SN01308790-W 20070603/070604110320 (fbodaily.com)
- Source
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