3f:null 40:["$","title",null,{"children":"Radioactive Decay: Calculating Activity with IAEA ENSDF Data. | Niall Murphy's Workspace | Observable"}] 46:T418,function decayCorrection (endsfDataHalfLifeData, nuSymbol, activity, timeStart, timeEnd) { try { // Filter the data for the given nuSymbol const dataForNuSymbol = endsfDataHalfLifeData.find(d => nuSymbol.includes(d.nusymbol)); // Check if data for the nuSymbol is available if (!dataForNuSymbol) { console.warn(`No data found for nuSymbol: ${nuSymbol}`); return 'n.a.'; } // Extract values from endsfDataHalfLifeData. const halfLifeSec = dataForNuSymbol.half_life_sec; // Calculate time difference in seconds const timeDiffSec = (new Date(timeEnd) - new Date(timeStart))/1000; // Calculate the decay constant lambda (per second). const lambda = Math.log(2)/halfLifeSec; // Calculate the decay-corrected activity const activityDecayCorrected = activity * Math.exp(-lambda * timeDiffSec); console.log(activityDecayCorrected); return activityDecayCorrected; } catch (error) { console.error('Error processing decay half-life:', error); return 'n.a.'; } } 47:T549,viewof decayCorrectedActivityUncertaintyFormula = html`

Uncertainty in the Decay-Corrected Activity

The uncertainty in the decay-corrected activity ${tex`\Delta A(t)`} of a radioisotope at time ${tex`t`} is given by:

${tex.block` \Delta A(t) = A(t) \sqrt{ \left( \frac{\Delta A_0}{A_0} \right)^2 + \left( \frac{\ln(2) \cdot t}{T_{1/2}^2} \Delta T_{1/2} \right)^2 + \left( \frac{\ln(2)}{T_{1/2}} \Delta t \right)^2 } `}

Where:

A(t) is the activity at time t.
ΔA(t) is the uncertainty in the activity at time t.
A₀ is the initial activity (the activity at t = 0).
ΔA₀ is the uncertainty in the initial activity A₀.
t is the elapsed time.
Δt is the uncertainty in the elapsed time t.
T₁/₂ is the half-life of the radioisotope, the time required for the activity to decrease to half of its initial value.
ΔT₁/₂ is the uncertainty in the half-life T₁/₂.

` 48:Tc63,function decayCorrectionUncertainty( decayCorrection, // Function to calculate decay-corrected activity endsfDataHalfLifeData, nuSymbol, initialActivity, deltaInitialActivity, timeStart, timeEnd, deltaTimeSec = 0, // Default value for uncertainty in time verbose = false // Default value for verbose logging ) { try { // Find the data for the given nuSymbol const dataForNuSymbol = endsfDataHalfLifeData.find(d => nuSymbol === d.nusymbol); // Check if data for the nuSymbol is available if (!dataForNuSymbol) { console.warn(`No data found for nuSymbol: ${nuSymbol}`); return 'n.a.'; } // Extract values from endsf data const halfLifeSec = dataForNuSymbol.half_life_sec; // half-life in seconds const deltaHalfLifeSec = dataForNuSymbol.unc_hl; // Uncertainty of half-life in seconds // Calculate time difference in seconds const timeDiffSec = (new Date(timeEnd) - new Date(timeStart)) / 1000; // Time difference in seconds // Calculate activity at time t const decayCorrectedActivity = decayCorrection( endsfDataHalfLifeData, nuSymbol, initialActivity, timeStart, timeEnd ); // Calculate ln(2) const ln2 = Math.log(2); // Calculate uncertainty terms const term1 = Math.pow(deltaInitialActivity / initialActivity, 2); const term2 = Math.pow(((ln2 * timeDiffSec) / Math.pow(halfLifeSec, 2)) * deltaHalfLifeSec, 2); const term3 = Math.pow((ln2 / halfLifeSec) * deltaTimeSec, 2); // Calculate total uncertainty term const uncertaintyTerm = Math.sqrt(term1 + term2 + term3); // Calculate the uncertainty of the decay-corrected activity const activityDecayCorrectedUncertainty = decayCorrectedActivity * uncertaintyTerm; if (verbose) { console.log(`Initial Activity (A0): ${initialActivity}`); console.log(`Uncertainty in Initial Activity (ΔA0): ${deltaInitialActivity}`); console.log(`Time Difference (Δt): ${timeDiffSec} seconds`); console.log(`Uncertainty in Time (Δt): ${deltaTimeSec}`); console.log(`Half-Life (T1/2): ${halfLifeSec} seconds`); console.log(`Uncertainty in Half-Life (ΔT1/2): ${deltaHalfLifeSec}`); console.log(`ln(2): ${ln2}`); console.log(`Term 1 (ΔA0 / A0)²: ${term1}`); console.log(`Term 2 ((ln(2) * t / T1/2²) * ΔT1/2)²: ${term2}`); console.log(`Term 3 ((ln(2) / T1/2) * Δt)²: ${term3}`); console.log(`Total Uncertainty Term: ${uncertaintyTerm}`); console.log(`Decay-Corrected Activity: ${decayCorrectedActivity}`); console.log(`Activity Decay-Corrected Uncertainty: ${activityDecayCorrectedUncertainty}`); } console.log(activityDecayCorrectedUncertainty); return activityDecayCorrectedUncertainty; } catch (error) { console.error('Error processing decay half-life and uncertainty:', error); return 'n.a.'; } } 49:Tb28,// New function to call both decayCorrection and decayCorrectionUncertainty function calculateActivityAndUncertainty( decayCorrection, // Function to calculate decay-corrected activity decayCorrectionUncertainty, // Function to calculate uncertainty in decay-corrected activity endsfDataHalfLifeData, // Data source containing half-life information nuSymbol, // Symbol for the nuclide initialActivity, // Initial activity measurement deltaInitialActivity, // Uncertainty of initial activity timeStart, // Start date and time timeEnd, // End date and time deltaTimeSec = 0, // Default value for uncertainty of time (in seconds) verbose = false // Default value for verbose logging ) { try { // Find the data for the given nuSymbol const dataForNuSymbol = endsfDataHalfLifeData.find(d => nuSymbol === d.nusymbol); // Check if data for the nuSymbol is available if (dataForNuSymbol) { // Extract relevant data const halfLife = dataForNuSymbol.half_life; // Half-life (in original units) const deltaHalfLife = dataForNuSymbol.unc_hl; // Uncertainty of half-life (in original units) const unitHalfLife = dataForNuSymbol.unit_hl; // Unit of half-life const halfLifeSec = dataForNuSymbol.half_life_sec; // Half-life in seconds const deltaHalfLifeSec = dataForNuSymbol.unc_hls; // Uncertainty in half-life in seconds // Calculate activity at time t const decayCorrectedActivity = decayCorrection( endsfDataHalfLifeData, nuSymbol, initialActivity, timeStart, timeEnd ); // Calculate uncertainty in decay-corrected activity const uncertainty = decayCorrectionUncertainty( decayCorrection, endsfDataHalfLifeData, nuSymbol, initialActivity, deltaInitialActivity, timeStart, timeEnd, deltaTimeSec, verbose ); // Return formatted results return `**Decay Calculation Details:** - **Radioisotope:** ${nuSymbol} - **Half-life:** ${halfLife}(${deltaHalfLife}) ${unitHalfLife} - **Half-life (seconds):** ${halfLifeSec} (± ${deltaHalfLifeSec}) seconds - **Initial activity:** ${initialActivity} ± ${deltaInitialActivity} (on ${timeStart}) - **Decay corrected activity:** ${decayCorrectedActivity} ± ${uncertainty} (on ${timeEnd})`; } else { return '**Error:** No data found for the specified nuclide.'; } } catch (error) { console.error('Error calculating activity and uncertainty:', error); return '**Error:** An unexpected error occurred.'; } } 4a:[{"id":"b2a26d09c949eede3ffeb642a77635186231c51bd1318d79124c2ae5c224701913d17e4399b5723f3ca3fd7f4742fc81d6251d59f610d4d2a11994ac8e23e3d7","href":"https://static.observableusercontent.com/files/b2a26d09c949eede3ffeb642a77635186231c51bd1318d79124c2ae5c224701913d17e4399b5723f3ca3fd7f4742fc81d6251d59f610d4d2a11994ac8e23e3d7","name":"iaea_ensdf_2024AUG05.json","type":"application/json","lastModified":1722851926667.018,"size":470490}] 44:{"id":"da98a26715c740c6","slug":"radioactive-decay-calculations","title":"Radioactive Decay: Calculating Activity with IAEA ENSDF Data.","thumbnail":"ca3e0c7595cd085ffd785c7d491f87186f02561d7a3bddd04577720b45f512f3","access_level":"public","create_time":"$D2024-01-08T08:51:46.436Z","update_time":"$D2024-08-14T12:33:05.900Z","view_time":null,"first_public_time":"$D2024-01-08T08:51:46.436Z","has_unpublished_edits":null,"fork":false,"stars":0,"starred":false,"owner":{"type":"team","id":"f8306151feee98aa","login":"niall-murphy-ws","name":"Niall Murphy's Workspace","avatar_url":"https://avatars-next.observableusercontent.com/2db4603194605dd2f5d5c36ac6e1778df64480d2ea968da7fea286523e32dab8","tier":"starter_2024","bio":"","following":false},"version":948,"publish_version":null,"role":null,"authored":false,"authors":[{"type":"individual","id":"0610612da6ec42b6","login":"niall-murphy","name":"Niall Murphy","avatar_url":"https://avatars-next.observableusercontent.com/3e40207538d1a146f54f809649e35d87d949baa7089d0d52650aab00d264fb99","tier":null,"bio":"","following":false}],"members":[{"type":"individual","id":"0610612da6ec42b6","login":"niall-murphy","name":"Niall Murphy","avatar_url":"https://avatars-next.observableusercontent.com/3e40207538d1a146f54f809649e35d87d949baa7089d0d52650aab00d264fb99","tier":null,"role":"editor"},{"type":"team","id":"f8306151feee98aa","login":"niall-murphy-ws","name":"Niall Murphy's Workspace","avatar_url":"https://avatars-next.observableusercontent.com/2db4603194605dd2f5d5c36ac6e1778df64480d2ea968da7fea286523e32dab8","tier":"starter_2024","role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"lapsed":null,"subscribed":null,"forks":0,"collection":null,"type":"notebook","body":{"titling":"auto","title":"Radioactive Decay: Calculating Activity with IAEA ENSDF Data.","cells":[{"id":0,"value":"# Radioactive Decay: Calculating Activity with IAEA ENSDF Data.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":10,"value":"Calculate radioactive decay using **IAEA ENSDF**: International Atomic Energy Agency's Evaluated Nuclear Structure Data Files, April 2022 snapshot available at [IAEA ENSDF API](https://www-nds.iaea.org/relnsd/vcharthtml/api_v0_guide.html#apiset).\n\n\n","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":942,"value":"","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":35,"value":"# Retrieve IAEA ENSDF: Evaluated Nuclear Structure Data Files via API.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":477,"value":"The latest data from the [IAEA ENSDF](https://www-nds.iaea.org/relnsd/vcharthtml/api_v0_guide.html#apiset) is accessible from their API. Due to CORS policy restrictions, a CORS proxy is required to access the IAEA ENSDF API from [ObservableHQ](https://observablehq.com/). We are using the proxy [https://cors-anywhere.herokuapp.com/](https://cors-anywhere.herokuapp.com/) for this purpose. To activate this proxy, please visit [https://cors-anywhere.herokuapp.com/](https://cors-anywhere.herokuapp.com/) and select 'Request temporary access to the demo server'.\n\nAdditionally, the data is provided in this notebook in JSON file format, retrieved from the IAEA ENSDF file (accessed: August 5, 2024).\n","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":19,"value":"GENERAL POLICIES related to IAEA ENSDF: Evaluated Nuclear Structure Data Files can be found at https://www.nndc.bnl.gov/nds/docs/NDSPolicies.pdf. See GENERAL POLICIES to understand how uncertainties are formatted.\n\n","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":765,"value":"The API URL, including the proxy address:","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":17,"value":"apiURL = \"https://cors-anywhere.herokuapp.com/https://www-nds.iaea.org/relnsd/v1/data?fields=ground_states&nuclides=all\"","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":50,"value":"Fetch data from `apiURL` with `d3.csv` function from d3. If you receive a 'Error: 403 Forbidden', ensure that you have enabled a CORS proxy, as detailed above, or use the static data, `staticIaeaEndsf` (accessed: August 5, 2024).\n","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":5,"value":"endsf_data = d3.csv(apiURL)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":52,"value":"Filter the data to include only entries related to half-life information.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":54,"value":"endsf_data_half_life=endsf_data.map(d => ({\n z: Number(d.z),\n n: Number(d.n),\n m: Number(d.n) + Number(d.z),\n nusymbol: (Number(d.n) + Number(d.z))+d.symbol,\n symbol: d.symbol,\n half_life: d.half_life,\n unc_hl: d.unc_hl,\n unit_hl: d.unit_hl, \n half_life_sec: d.half_life_sec, \n unc_hls: d.unc_hls\n}))","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":446,"value":"endsf_data_half_life","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":451,"value":"## Load IAEA ENSDF Half-Life Information via JSON (Accessed: August 5, 2024)","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":606,"value":"staticIaeaEndsf = FileAttachment(\"iaea_ensdf_2024AUG05.json\").json()\n","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":770,"value":"## Display IAEA ENSDF Half-Life Information as a Table\n\nThe following table presents the half-life data from the IAEA ENSDF dataset. The data has been extracted and formatted for easy viewing and analysis.\n","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":610,"value":"staticIaeaEndsf","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":503,"value":"viewof decayCorrectedActivityFormula = html`\n

Formula for Decay-Corrected Activity

The activity ${tex`A(t)`} of a radioisotope at time ${tex`t`} is given by:

${tex.block`A(t) = A_0 \\, e^{-\\lambda t}`}

where:

${tex`A(t)`} is the activity at time ${tex`t`}.
${tex`A_0` } is the initial activity (the activity at ${tex`t = 0` }).
${tex`\\lambda` } is the decay constant, which describes the rate of radioactive decay.
${tex`t` } is the elapsed time.

The decay constant ${tex`\\lambda` } is related to the half-life ${tex`T_{1/2}` } of the radioisotope by:

${tex.block`\\lambda = \\frac{\\ln(2)}{T_{1/2}}`}

where:

${tex`T_{1/2}` } is the half-life of the radioisotope, the time required for the activity to decrease to half of its initial value.
${tex`\\ln(2)` } is the natural logarithm of 2.

\n`\n","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":549,"value":"The decay-corrected activity is calculated using the `decayCorrection` function as follows:","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":64,"value":"$46","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":163,"value":"Test the function (decayCorrection). Date must be in ISO format (yyyy-mm-dd).","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":73,"value":"decayCorrection(staticIaeaEndsf, //ENDSF half-life data.\n '137Cs', //nuSymbol\n 100 , // activity\n '2000-01-01', // timeStart\n '2012-01-01' // timeEnd\n )","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":527,"value":"## Formula for Decay-Corrected Activity Uncertainty Propagation\n","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":534,"value":"$47","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":558,"value":"Test the function (decayCorrectionUncertainty). Date must be in ISO format (yyyy-mm-dd).\n\n","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":846,"value":"$48","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":562,"value":"decayCorrectionUncertainty(\n decayCorrection, // decayCorrection function\n staticIaeaEndsf, // Variable holding the half-life data\n '137Cs', // nuSymbol\n 100, // initialActivity\n 3, // deltaInitialActivity\n '2000-01-01', // timeStart\n '2012-01-01', // timeEnd\n 1, // deltaTimeSec (optional, defaults to 0)\n true // verbose\n);\n","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":745,"value":"This function, calculateActivityAndUncertainty, calculates the decay-corrected activity and its uncertainty for a given nuclide, considering its half-life and measurement errors.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":895,"value":"$49","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":868,"value":"calculateActivityAndUncertainty(\n decayCorrection, // Function to calculate decay-corrected activity\n decayCorrectionUncertainty, // Function to calculate uncertainty in decay-corrected activity\n staticIaeaEndsf,\n '137Cs', // nuSymbol\n 100, // initialActivity\n 3, // deltaInitialActivity\n '2000-01-01', // timeStart\n '2012-01-01', // timeEnd\n 0, // Uncertainty of time\n false) // verbose logging\n","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":926,"value":"Function to add 10 days to the initial End date and time. ","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":924,"value":"function formatDate(date) {\n const year = date.getFullYear();\n const month = String(date.getMonth() + 1).padStart(2, '0');\n const day = String(date.getDate()).padStart(2, '0');\n const hours = String(date.getHours()).padStart(2, '0');\n const minutes = String(date.getMinutes()).padStart(2, '0');\n \n return `${year}-${month}-${day}T${hours}:${minutes}`;\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":930,"value":"now = new Date();\n","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":932,"value":"tenDaysFromNow = new Date(now.setDate(now.getDate() + 10));\n","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":591,"value":"viewof decayCorrectedActivityCalculatorHeading = html`\n

Decay-Corrected Activity Calculator

\n`\n","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":642,"value":"viewof nuclide_selected = Inputs.select(\n staticIaeaEndsf.map(item => item[\"nusymbol\"])// Extract the nuclide symbols\n .sort((a, b) => { // Sort numerically\n const numA = parseFloat(a.replace(/[^\\d.-]/g, '')) || 0;\n const numB = parseFloat(b.replace(/[^\\d.-]/g, '')) || 0;\n return numA - numB;\n }), \n {\n label: \"Select Nuclide\",\n unique: true, \n value: '137Cs' // Set default value\n }\n)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":661,"value":"viewof activity_input = Text({\n label: \"Initial Activity or Activity Concentration\",\n type: \"number\", \n value: 100\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":677,"value":"viewof activity_unc_input = Text({\n label: \"Uncertainty of Initial Activity or Activity Concentration\",\n type: \"number\", \n value: 3\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":681,"value":"viewof begin_datetime = Inputs.datetime({label: \"Begin date and time\", value: new Date().toISOString().slice(0, 16)});","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":685,"value":"viewof end_datetime = Inputs.datetime({label: \"End date and time\", value: tenDaysFromNow});","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":857,"value":"viewof uncertaintyTime = Text({label: \"Uncertainty of time (seconds)\",value: 0});","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":724,"value":"calculatedResult=calculateActivityAndUncertainty(\n decayCorrection, // Function to calculate decay-corrected activity\n decayCorrectionUncertainty, // Function to calculate uncertainty in decay-corrected activity\n staticIaeaEndsf,\n nuclide_selected, // nuSymbol\n activity_input, // initialActivity\n activity_unc_input, // deltaInitialActivity\n begin_datetime, // timeStart\n end_datetime, // timeEnd\n uncertaintyTime, // Uncertainty of time\n true) // verbose logging\n\n","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":773,"value":"# IMPORTS","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":669,"value":"import {Range, Text} from \"@observablehq/inputs\"","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":914,"value":"# TODO","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":916,"value":"- [ ] Update the decay calculator to show the number of days/hours/seconds between the initial time and end time. ","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"}],"files":"$W4a","stdlib":"1"}} 45:"$44:body"