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As a side note, DICOM has a mechanism to support semantics for describing quantities and units.
UCUM is used for units: http://unitsofmeasure.org/trac, and various terminologies are used for quantities. Some examples of quantity definitions are here: http://dicom.nema.org/medical/dicom/current/output/chtml/part16/chapter_D.html#para_5a00de2c-9c86-4b9b-aa0a-19ff0d09d0b0.
As a step towards reconciliation of SEM with DICOM, I would suggest to at least use a separate attribute <units> to explicitly encode the units, instead of hiding it inside <description>.
Here's an example of how quantity/units can be described in DICOM using Real World Value Mapping module.
(0040,9096) SQ (Sequence with explicit length #=1) # 578, 1 RealWorldValueMappingSequence
(fffe,e000) na (Item with explicit length #=8) # 570, 1 Item
(0028,3003) LO [Standardized Uptake Value body weight] # 38, 1 LUTExplanation
(0040,08ea) SQ (Sequence with explicit length #=1) # 86, 1 MeasurementUnitsCodeSequence
(fffe,e000) na (Item with explicit length #=3) # 78, 1 Item
(0008,0100) SH [{SUVbw}g/ml] # 12, 1 CodeValue
(0008,0102) SH [UCUM] # 4, 1 CodingSchemeDesignator
(0008,0104) LO [Standardized Uptake Value body weight] # 38, 1 CodeMeaning
(fffe,e00d) na (ItemDelimitationItem for re-encoding) # 0, 0 ItemDelimitationItem
(fffe,e0dd) na (SequenceDelimitationItem for re-encod.) # 0, 0 SequenceDelimitationItem
(0040,9210) SH [{SUVbw}g/ml] # 12, 1 LUTLabel
(0040,9211) US 32761 # 2, 1 RealWorldValueLastValueMapped
(0040,9216) SS 0 # 2, 1 RealWorldValueFirstValueMapped
(0040,9220) SQ (Sequence with explicit length #=2) # 342, 1 QuantityDefinitionSequence
(fffe,e000) na (Item with explicit length #=3) # 154, 1 Item
(0040,a040) CS [CODE] # 4, 1 ValueType
(0040,a043) SQ (Sequence with explicit length #=1) # 50, 1 ConceptNameCodeSequence
(fffe,e000) na (Item with explicit length #=3) # 42, 1 Item
(0008,0100) SH [G-C1C6] # 6, 1 CodeValue
(0008,0102) SH [SRT] # 4, 1 CodingSchemeDesignator
(0008,0104) LO [Quantity] # 8, 1 CodeMeaning
(fffe,e00d) na (ItemDelimitationItem for re-encoding) # 0, 0 ItemDelimitationItem
(fffe,e0dd) na (SequenceDelimitationItem for re-encod.) # 0, 0 SequenceDelimitationItem
(0040,a168) SQ (Sequence with explicit length #=1) # 68, 1 ConceptCodeSequence
(fffe,e000) na (Item with explicit length #=3) # 60, 1 Item
(0008,0100) SH [126400] # 6, 1 CodeValue
(0008,0102) SH [DCM] # 4, 1 CodingSchemeDesignator
(0008,0104) LO [Standardized Uptake Value] # 26, 1 CodeMeaning
(fffe,e00d) na (ItemDelimitationItem for re-encoding) # 0, 0 ItemDelimitationItem
(fffe,e0dd) na (SequenceDelimitationItem for re-encod.) # 0, 0 SequenceDelimitationItem
(fffe,e00d) na (ItemDelimitationItem for re-encoding) # 0, 0 ItemDelimitationItem
(fffe,e000) na (Item with explicit length #=3) # 172, 1 Item
(0040,a040) CS [CODE] # 4, 1 ValueType
(0040,a043) SQ (Sequence with explicit length #=1) # 60, 1 ConceptNameCodeSequence
(fffe,e000) na (Item with explicit length #=3) # 52, 1 Item
(0008,0100) SH [G-C036] # 6, 1 CodeValue
(0008,0102) SH [SRT] # 4, 1 CodingSchemeDesignator
(0008,0104) LO [Measurement Method] # 18, 1 CodeMeaning
(fffe,e00d) na (ItemDelimitationItem for re-encoding) # 0, 0 ItemDelimitationItem
(fffe,e0dd) na (SequenceDelimitationItem for re-encod.) # 0, 0 SequenceDelimitationItem
(0040,a168) SQ (Sequence with explicit length #=1) # 76, 1 ConceptCodeSequence
(fffe,e000) na (Item with explicit length #=3) # 68, 1 Item
(0008,0100) SH [126410] # 6, 1 CodeValue
(0008,0102) SH [DCM] # 4, 1 CodingSchemeDesignator
(0008,0104) LO [SUV body weight calculation method] # 34, 1 CodeMeaning
(fffe,e00d) na (ItemDelimitationItem for re-encoding) # 0, 0 ItemDelimitationItem
(fffe,e0dd) na (SequenceDelimitationItem for re-encod.) # 0, 0 SequenceDelimitationItem
(fffe,e00d) na (ItemDelimitationItem for re-encoding) # 0, 0 ItemDelimitationItem
(fffe,e0dd) na (SequenceDelimitationItem for re-encod.) # 0, 0 SequenceDelimitationItem
(0040,9224) FD 0 # 8, 1 RealWorldValueIntercept
(0040,9225) FD 0.00037512500000000006 # 8, 1 RealWorldValueSlope
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