Technetium-99m

Property	Value
Decay mode chemrof:decay_mode	IT≈100%; β-=0.0037±0.6%
Half life chemrof:half_life	0.0006852156057494866
Has element chemrof:has_element	{'@id': 'https://vocab.brightway.dev/flow-objects/fo-dc268fb4a63f197d'}
Isotope isotope	{"nuclide":"99Tcm","mass_number":99,"atomic_mass_and_uncertainty_u":"98.906249681 ± 0.000000974","half_life_and_uncertainty":"6.0066 h ± 0.0002","decay_modes":"IT≈100%; β-=0.0037±0.6%","discovery_year":"1958","specific_activity_bq_per_g":"1.9515426033329e+17","specific_activity_bq_per_g_value":1.9515426033329e+17,"half_life_chemlin":"6.0066(2) h (NUBASE2020)","chemlin_url":"https://www.chemlin.org/isotope/technetium-99m","isomer_resolution":{"wanted_nuclide":"Tc-99m","expected_half_life_days":0.25027499999999997,"attempted_slugs":["99","99m","99m1","99m2","99m3"],"attempted_urls":["https://www.chemlin.org/isotope/technetium-99","https://www.chemlin.org/isotope/technetium-99m","https://www.chemlin.org/isotope/technetium-99m1","https://www.chemlin.org/isotope/technetium-99m2","https://www.chemlin.org/isotope/technetium-99m3"],"strategy":"half_life_agrees_with_pubchem","selected_slug":"technetium-99m","selected_half_life":"6.0066(2) h (NUBASE2020)","selected_half_life_days":0.25027499999999997,"half_life_ratio_to_pubchem":1.0,"alternates":[{"slug":"technetium-99","url":"https://www.chemlin.org/isotope/technetium-99","half_life":"2.115(12)e5 years (DDEP-2025 [04])","half_life_days":77250375.00000001}]},"symbol":"Tc","isomeric_state":"m","metastable":true}
Isotope lookup isotope_lookup	{"is_kbq_candidate":true,"matched":true,"matched_on":"Technetium-99m","claimed_nuclide":"Tc-99m","resolved_nuclide":"Tc-99m","state_resolution":{"claimed_state":"m","selected_state":"m","strategy":"state_taken_as_written","candidates":[]},"checks":[{"check":"ground_state_does_not_decay_by_isomeric_transition","passed":true,"detail":"IT≈100%; β-=0.0037±0.6%"},{"check":"half_life_sources_agree","passed":true,"detail":{"pubchem_days":0.25027499999999997,"chemlin_days":0.25027499999999997,"ratio":1.0}}],"reason":"","source":"pubchem_pug_view_annotation_heading","sources":["pubchem_pug_view_annotation_heading","https://www.chemlin.org"],"isomer_resolution":{"wanted_nuclide":"Tc-99m","expected_half_life_days":0.25027499999999997,"attempted_slugs":["99","99m","99m1","99m2","99m3"],"attempted_urls":["https://www.chemlin.org/isotope/technetium-99","https://www.chemlin.org/isotope/technetium-99m","https://www.chemlin.org/isotope/technetium-99m1","https://www.chemlin.org/isotope/technetium-99m2","https://www.chemlin.org/isotope/technetium-99m3"],"strategy":"half_life_agrees_with_pubchem","selected_slug":"technetium-99m","selected_half_life":"6.0066(2) h (NUBASE2020)","selected_half_life_days":0.25027499999999997,"half_life_ratio_to_pubchem":1.0,"alternates":[{"slug":"technetium-99","url":"https://www.chemlin.org/isotope/technetium-99","half_life":"2.115(12)e5 years (DDEP-2025 [04])","half_life_days":77250375.00000001}]}}
Nucleon number chemrof:nucleon_number	99
Relationships relationships	{"parent_element_flow_object_id":"fo-dc268fb4a63f197d","relationship_type":"isotope_of"}
Symbol chemrof:symbol	Tc

Where else this substance is described. Collected while the pipeline resolved it — from ChEBI's cross-references, from PubChem's identifier list, and from the CAS number — so a link here is a record the merge actually read, not a search it suggests.

Resource	URL	Recorded by
CAS Common Chemistry	https://commonchemistry.cas.org/detail?cas_rn=378784-45-3	enrich_references.consensus_cas_link
ChemLin	https://www.chemlin.org	—
ChemLin	https://www.chemlin.org/isotope/technetium-99	—
ChemLin	https://www.chemlin.org/isotope/technetium-99m	—
PubChem	https://pubchem.ncbi.nlm.nih.gov/element/43	—
PubChem	https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/element/43/JSON	—

Flow	Context	Source	Unit
e9623d08-fa4c-450d-9074-0ca7d87cb43e	Environmental → Water → Long-term	EF 3.1	kBq
91d10e9e-1170-4ea9-882a-918e09b9b4a2	Environmental → Water → Ocean	EF 3.1	kBq
bb2496d2b3c1df0462f05e87ebda5f1cf096f209	Environmental → Water → River	bafu algorithm addition	kBq
13e353a4-e56c-477b-abd0-4ede4def91ad	Environmental → Water → Surface water	EF 3.1	kBq
aa28eafd8341dfb6cfa912584037a7b562666b0a	Environmental → Water → Unconfined aquifer	ecoinvent algorithm addition	kBq
d65d60a6-4842-42fe-a206-5c5e5e6e3d15	Environmental → Water → Unknown	EF 3.1	kBq
94b93899-b947-456b-8143-01d6fcbd7512 deprecated	Environmental → Water → Surface water	EF 3.1	kBq

Everything that changed this substance (25 changes)

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Flow object JSON

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    {
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      "@language": "en",
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  ],
  "altLabel": [],
  "properties": {
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      "matched_on": "Technetium-99m",
      "claimed_nuclide": "Tc-99m",
      "resolved_nuclide": "Tc-99m",
      "state_resolution": {
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        "strategy": "state_taken_as_written",
        "candidates": []
      },
      "checks": [
        {
          "check": "ground_state_does_not_decay_by_isomeric_transition",
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        },
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      "specific_activity_bq_per_g_value": 1.9515426033329e+17,
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        ],
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          }
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      },
      "symbol": "Tc",
      "isomeric_state": "m",
      "metastable": true
    },
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  "references": [
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          "prov:wasDerivedFrom": "another row of this source list gives this name"
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  "parent_flow_object_id": null,
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}

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Technetium-99m

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