SNS Facility Background Measurements L. Funk did all the real work.

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Presentation transcript:

SNS Facility Background Measurements L. Funk did all the real work

Use portable 8-pack to map prompt pulse background in Target building and experiment room Effectively a mini-instrument, with TOF Recording capability 3He tubes like HYSPEC’s (similar pressure But smaller diameter and length) Mostly portable; rides on a cart which isn’t all That easy to move around (one LCD terminal Down…). Prefer much more mobile, like atop BL 10 crevice Use partial shielding to -characterize observed spectra -observe some directionality

Sequoia short full 8-pack count rate (ct/s), raw Before extra shieldingAfter extra shielding BL-11 Primary Shutter Closed 3.1 Mezzanine Level

mrem/hr New LPSD. Spring 2012

Effects of position and shielding: overall counts and tail shape

Shielding variations B-10 loaded aluminum 1 mm thick Cadmium 1.5 mm thick 1 gallon of water Lead Maxus plate 1 cm thick Regular density concrete Heavy concrete brick Some potential to estimate distance to moderated source

vary thickness of B-10 aluminum

Cadmium vs. Boron

Limited directionality measurements (shielding behind portable LPSD)

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