RadioActivity.java
package org.djunits.quantity;
import org.djunits.quantity.def.Quantity;
import org.djunits.unit.AbstractUnit;
import org.djunits.unit.UnitRuntimeException;
import org.djunits.unit.Unitless;
import org.djunits.unit.Units;
import org.djunits.unit.scale.LinearScale;
import org.djunits.unit.scale.Scale;
import org.djunits.unit.si.SIUnit;
import org.djunits.unit.system.UnitSystem;
/**
* Radioactivity is the rate of nuclear decay events, measured in becquerels (Bq).
* <p>
* Copyright (c) 2025-2026 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See
* for project information <a href="https://djunits.org" target="_blank">https://djunits.org</a>. The DJUNITS project is
* distributed under a <a href="https://djunits.org/docs/license.html" target="_blank">three-clause BSD-style license</a>.
* @author Alexander Verbraeck
*/
public class RadioActivity extends Quantity<RadioActivity, RadioActivity.Unit>
{
/** Constant with value zero. */
public static final RadioActivity ZERO = RadioActivity.ofSi(0.0);
/** Constant with value one. */
public static final RadioActivity ONE = RadioActivity.ofSi(1.0);
/** Constant with value NaN. */
@SuppressWarnings("checkstyle:constantname")
public static final RadioActivity NaN = RadioActivity.ofSi(Double.NaN);
/** Constant with value POSITIVE_INFINITY. */
public static final RadioActivity POSITIVE_INFINITY = RadioActivity.ofSi(Double.POSITIVE_INFINITY);
/** Constant with value NEGATIVE_INFINITY. */
public static final RadioActivity NEGATIVE_INFINITY = RadioActivity.ofSi(Double.NEGATIVE_INFINITY);
/** Constant with value MAX_VALUE. */
public static final RadioActivity POS_MAXVALUE = RadioActivity.ofSi(Double.MAX_VALUE);
/** Constant with value -MAX_VALUE. */
public static final RadioActivity NEG_MAXVALUE = RadioActivity.ofSi(-Double.MAX_VALUE);
/** */
private static final long serialVersionUID = 600L;
/**
* Instantiate a RadioActivity quantity with a unit.
* @param value the value, expressed in the unit
* @param unit the unit in which the value is expressed
*/
public RadioActivity(final double value, final RadioActivity.Unit unit)
{
super(value, unit);
}
/**
* Instantiate a RadioActivity quantity with a unit, expressed as a String.
* @param value the value, expressed in the unit
* @param abbreviation the String abbreviation of the unit in which the value is expressed
*/
public RadioActivity(final double value, final String abbreviation)
{
this(value, Units.resolve(RadioActivity.Unit.class, abbreviation));
}
/**
* Construct RadioActivity quantity.
* @param value Scalar from which to construct this instance
*/
public RadioActivity(final RadioActivity value)
{
super(value.si(), RadioActivity.Unit.SI);
setDisplayUnit(value.getDisplayUnit());
}
/**
* Return a RadioActivity instance based on an SI value.
* @param si the si value
* @return the RadioActivity instance based on an SI value
*/
public static RadioActivity ofSi(final double si)
{
return new RadioActivity(si, RadioActivity.Unit.SI);
}
@Override
public RadioActivity instantiate(final double si)
{
return ofSi(si);
}
@Override
public SIUnit siUnit()
{
return RadioActivity.Unit.SI_UNIT;
}
/**
* Returns a RadioActivity representation of a textual representation of a value with a unit. The String representation that
* can be parsed is the double value in the unit, followed by a localized or English abbreviation of the unit. Spaces are
* allowed, but not required, between the value and the unit.
* @param text the textual representation to parse into a RadioActivity
* @return the Scalar representation of the value in its unit
* @throws IllegalArgumentException when the text cannot be parsed
* @throws NullPointerException when the text argument is null
*/
public static RadioActivity valueOf(final String text)
{
return Quantity.valueOf(text, ZERO);
}
/**
* Returns a RadioActivity based on a value and the textual representation of the unit, which can be localized.
* @param value the value to use
* @param unitString the textual representation of the unit
* @return the Scalar representation of the value in its unit
* @throws IllegalArgumentException when the unit cannot be parsed or is incorrect
* @throws NullPointerException when the unitString argument is null
*/
public static RadioActivity of(final double value, final String unitString)
{
return Quantity.of(value, unitString, ZERO);
}
/**
* Calculate the division of RadioActivity and RadioActivity, which results in a Dimensionless quantity.
* @param v quantity
* @return quantity as a division of RadioActivity and RadioActivity
*/
public final Dimensionless divide(final RadioActivity v)
{
return new Dimensionless(this.si() / v.si(), Unitless.BASE);
}
/******************************************************************************************************/
/********************************************** UNIT CLASS ********************************************/
/******************************************************************************************************/
/**
* RadioActivity.Unit encodes the units of radioactivity.
* <p>
* Copyright (c) 2025-2026 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved.
* See for project information <a href="https://djunits.org" target="_blank">https://djunits.org</a>. The DJUNITS project is
* distributed under a <a href="https://djunits.org/docs/license.html" target="_blank">three-clause BSD-style license</a>.
* @author Alexander Verbraeck
*/
@SuppressWarnings("checkstyle:constantname")
public static class Unit extends AbstractUnit<RadioActivity.Unit, RadioActivity>
{
/** The dimensions of radioactivity: /s. */
public static final SIUnit SI_UNIT = SIUnit.of("/s");
/** Becquerel. */
public static final RadioActivity.Unit Bq = new RadioActivity.Unit("Bq", "becquerel", 1.0, UnitSystem.SI_DERIVED);
/** The SI or BASE unit. */
public static final RadioActivity.Unit SI = Bq.generateSiPrefixes(false, false);
/** kBq. */
public static final RadioActivity.Unit kBq = Units.resolve(RadioActivity.Unit.class, "kBq");
/** MBq. */
public static final RadioActivity.Unit MBq = Units.resolve(RadioActivity.Unit.class, "MBq");
/** GBq. */
public static final RadioActivity.Unit GBq = Units.resolve(RadioActivity.Unit.class, "GBq");
/** TBq. */
public static final RadioActivity.Unit TBq = Units.resolve(RadioActivity.Unit.class, "TBq");
/** Curie. */
public static final RadioActivity.Unit Ci = Bq.deriveUnit("Ci", "curie", 3.7E10, UnitSystem.OTHER);
/** milliCurie. */
public static final RadioActivity.Unit mCi = Ci.deriveUnit("mCi", "millicurie", 1.0E-3, UnitSystem.OTHER);
/** microCurie. */
public static final RadioActivity.Unit muCi = Ci.deriveUnit("muCi", "\u03BCCi", "microcurie", 1.0E-6, UnitSystem.OTHER);
/** nanoCurie. */
public static final RadioActivity.Unit nCi = Ci.deriveUnit("nCi", "nanocurie", 1.0E-9, UnitSystem.OTHER);
/** Rutherford. */
public static final RadioActivity.Unit Rd = Bq.deriveUnit("Rd", "rutherford", 1.0E6, UnitSystem.OTHER);
/**
* Create a new RadioActivity unit.
* @param id the id or main abbreviation of the unit
* @param name the full name of the unit
* @param scaleFactorToBaseUnit the scale factor of the unit to convert it TO the base (SI) unit
* @param unitSystem the unit system such as SI or IMPERIAL
*/
public Unit(final String id, final String name, final double scaleFactorToBaseUnit, final UnitSystem unitSystem)
{
super(id, name, new LinearScale(scaleFactorToBaseUnit), unitSystem);
}
/**
* Return a derived unit for this unit, with textual abbreviation(s) and a display abbreviation.
* @param textualAbbreviation the textual abbreviation of the unit, which doubles as the id
* @param displayAbbreviation the display abbreviation of the unit
* @param name the full name of the unit
* @param scale the scale to use to convert between this unit and the standard (e.g., SI, BASE) unit
* @param unitSystem unit system, e.g. SI or Imperial
*/
public Unit(final String textualAbbreviation, final String displayAbbreviation, final String name, final Scale scale,
final UnitSystem unitSystem)
{
super(textualAbbreviation, displayAbbreviation, name, scale, unitSystem);
}
@Override
public SIUnit siUnit()
{
return SI_UNIT;
}
@Override
public Unit getBaseUnit()
{
return SI;
}
@Override
public RadioActivity ofSi(final double si)
{
return RadioActivity.ofSi(si);
}
@Override
public Unit deriveUnit(final String textualAbbreviation, final String displayAbbreviation, final String name,
final double scaleFactor, final UnitSystem unitSystem)
{
if (getScale() instanceof LinearScale ls)
{
return new RadioActivity.Unit(textualAbbreviation, displayAbbreviation, name,
new LinearScale(ls.getScaleFactorToBaseUnit() * scaleFactor), unitSystem);
}
throw new UnitRuntimeException("Only possible to derive a unit from a unit with a linear scale");
}
}
}