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Repeat??XRF Analysis of the Yellow Base of CD V-715 Geiger Counter: 1. Titanium 2. Chromium 3. Lead 4. Iron 5. No Cadmium Detected Chemical Reactions of the earlier rusted piece: - Dissolves in both weak and strong acids, producing a clear yellow solution.?? - Minor effervescence (bubbling) was observed.?? - No detectable hydrogen sulfide (H?S) odor ("rotten egg" smell), ruling out sulfide-containing compounds (e.g., cadmium sulfide).?? Additional Observations: - Visible light transmittance analysis suggests the yellow pigment is chromium-based (e.g., lead chromate or chromium oxide).?? - The absence of H?S further supports the lack of cadmium sulfide pigment, aligning with??new XRF results.?? Comparison with CD V-750 Base Plate: - The CD V-750 features a similar steel framework but includes a??tin coating on the inner surface, absent in the CD V-715.?? - Tin may act as a corrosion-resistant layer Safety Implications: - Lead exposure remains a critical concern, particularly for children and pregnant individuals, due to its neurotoxicity.?? - Vintage devices like these may pose risks if pigments delaminate, rust, or require repainting. Proper handling (e.g., gloves, avoiding abrasion) is essential.?? - Modern regulations now restrict lead and cadmium in paints, but older items like the CD V series?likely predate such safeguards.?? - While unrelated to school buses (which typically use safer modern pigments), this case underscores the importance of verifying pigment safety in all yellow-painted objects, especially antiques.?? Pics and files to follow? Thanks? On Saturday, March 22, 2025, 12:48 AM, taray singh via groups.io <sukhjez@...> wrote:
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