src/NuclearMaterial.js

/**
 * Created by austin on 6/16/16.
 */

/**
 * Predefined isotopes:
     Cobalt 60
     Strontium 90 
     Iodine 129 
     Caesium 135 
     Caesium 137 
     Polonium 210 
     Radon 222 
     Radium 226 
     Torium 232 
     Uranium 233 
     Uranium 235 
     Uranium 238 
     Plutonium 238
     Plutonium 239
     Plutonium 240
     Americium 241
     Curium 242
 * 
 * 
 * @type {*[]}
 */
const ISOTOPES = [
    {name: "Cobalt", element: "Co", mass: 60, halfLife: 166349000, decayMode: "beta,gamma,gamma"},
    {name: "Strontium", element: "Sr", mass: 90, halfLife: 908839000, decayMode: "betaminus"},
    {name: "Iodine", element: "I", mass: 129, halfLife: 495444000000000, decayMode: "beta,gamma"},
    {name: "Caesium", element: "Cs", mass: 135, halfLife: 7.25328e+13, decayMode: "beta"},
    {name: "Caesium", element: "Cs", mass: 137, halfLife: 952072000, decayMode: "beta,gamma"},
    {name: "Polonium", element: "Po", mass: 210, halfLife: 11955700, decayMode: "alpha"},
    {name: "Radon", element: "Rn", mass: 222, halfLife: 330350, decayMode: "alpha"},
    {name: "Radium", element: "Ra", mass: 226, halfLife: 50491100000, decayMode: "alpha"},
    {name: "Thorium", element: "Th", mass: 232, halfLife: 443375000000000000, decayMode: "alpha"},
    {name: "Uranium", element: "U", mass: 233, halfLife: 5023860000000, decayMode: "alpha"},
    {name: "Uranium", element: "U", mass: 235, halfLife: 22209800000000000, decayMode: "alpha"},
    {name: "Uranium", element: "U", mass: 238, halfLife: 140996000000000000, decayMode: "alpha"},
    {name: "Plutonium", element: "Pu", mass: 238, halfLife: 2767540000, decayMode: "alpha"},
    {name: "Plutonium", element: "Pu", mass: 239, halfLife: 760837000000, decayMode: "alpha"},
    {name: "Plutonium", element: "Pu", mass: 240, halfLife: 207108000000, decayMode: "alpha"},
    {name: "Americium", element: "Am", mass: 241, halfLife: 13638900000, decayMode: "alpha"},
    {name: "Curium", element: "Cm", mass: 242, halfLife: 13824000, decayMode: "alpha"}
];


/**
 * Provides a few presets of common nuclear material as well as the ability to define a custom material
  */
class NuclearMaterial {

    /**
     *
     * @param {number|string} halfLifeOrName - either
     * @param {number} [atomicMass] - necessary with name if using preset (u)
     * @param {number} mass - Total mass of substance (g)
     * @param {string} [decayMode='']
     *
     * @example
     * // 100 grams of Cobalt-60
     * let cobalt60 = new NuclearMaterial("Cobalt", 60, 100);
     *
     * // 100 grams of Plutonium-238
     * let pu238 = new NuclearMaterial(2767540000, 238, 100);
     */
    constructor(halfLifeOrName, atomicMass, mass, decayMode = '') {
        if (typeof halfLifeOrName === 'number') {
            /**
             *
             * @type {number}
             * @private
             */
            this._halfLife = halfLifeOrName;

            /**
             * @type {number|*}
             * @private
             */
            this._atomicMass = atomicMass;

            /**
             * 
             * @type {string}
             * @private
             */
            this._decayMode = decayMode;

        } else {
            let isotopePreset;
            for (let i of ISOTOPES) {
                if (i.name === halfLifeOrName && i.mass == Math.round(atomicMass)) {
                    isotopePreset = i;
                    break;
                }
            }

            if (!isotopePreset) 
                throw new Error('There is no preset for ' + halfLifeOrName + '-'+ atomicMass);

            this._halfLife = isotopePreset.halfLife; // Map to known substances
            this._atomicMass = isotopePreset.mass;
            this._decayMode = isotopePreset.decayMode;
        }


        /**
         * 
         * @type {number}
         * @private
         */
        this._mass = mass;
    }

    /**
     * 
     * @returns {number}
     */
    get mass() {
        return this._mass;
    }

    /**
     * 
     * @returns {number|*}
     */
    get atomicMass() {
        return this._atomicMass;
    }

    /**
     * 
     * @returns {number|*}
     */
    get halfLife() {
        return this._halfLife;
    }

    /**
     * 
     * @returns {string|*}
     */
    get decayMode() {
        return this._decayMode;
    }
}

NuclearMaterial.PRESETS = ISOTOPES;

export default NuclearMaterial;