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AgeDecay
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**Doc:**     Exponentially decaying particle property based on age with user given decay time scale.    

**short class_name:** AgeDecay

**full class_name :** oceantracker.particle_properties.age_decay.AgeDecay

**Inheritance:** > ParameterBaseClass> _BaseParticleProperty> CustomParticleProperty> AgeDecay


Parameters:
************

	* ``class_name`` :   ``<class 'str'>``   *<optional>*
		Description: Class name as string A.B.C, used to import this class from python path

		- default: ``None``
		- data_type: ``<class 'str'>``

	* ``decay_time_scale`` :   ``<class 'float'>``   *<optional>*
		Description: Particle decays at  exp(-age/decay_time_scale), whee decay_time_scale is the mean lifetime

		- default: ``86400.0``
		- data_type: ``<class 'float'>``
		- units: ``sec``

	* ``description`` :   ``<class 'str'>``   *<optional>*
		- default: ``None``
		- data_type: ``<class 'str'>``

	* ``dtype`` :   ``<class 'str'>``   *<optional>*
		- default: ``float64``
		- data_type: ``<class 'str'>``
		- possible_values: ``['float64', 'float32', 'bool', 'int32', 'int16', 'int8', 'int64']``

	* ``initial_value`` :   ``<class 'float'>``   *<optional>*
		Description: Particle property values at the time of release

		- default: ``1.0``
		- data_type: ``<class 'float'>``

	* ``name`` :   ``<class 'str'>`` **<isrequired>**
		Description: Name used to refer to this particle property in code and output

		- default: ``None``
		- data_type: ``<class 'str'>``

	* ``prop_dim3`` :   ``<class 'int'>``   *<optional>*
		Description: size of a 3d dimesion of particle property

		- default: ``1``
		- data_type: ``<class 'int'>``
		- min: ``1``

	* ``time_varying`` :   ``<class 'bool'>``   *<optional>*
		- default: ``True``
		- data_type: ``<class 'bool'>``
		- possible_values: ``[True, False]``

	* ``units`` :   ``<class 'str'>``   *<optional>*
		- default: ``None``
		- data_type: ``<class 'str'>``

	* ``update`` :   ``<class 'bool'>``   *<optional>*
		- default: ``True``
		- data_type: ``<class 'bool'>``
		- possible_values: ``[True, False]``

	* ``user_note`` :   ``<class 'str'>``   *<optional>*
		- default: ``None``
		- data_type: ``<class 'str'>``

	* ``vector_dim`` :   ``<class 'int'>``   *<optional>*
		- default: ``1``
		- data_type: ``<class 'int'>``
		- min: ``1``

	* ``write`` :   ``<class 'bool'>``   *<optional>*
		Description: Write particle property to tracks or event files file

		- default: ``True``
		- data_type: ``<class 'bool'>``
		- possible_values: ``[True, False]``



Expert Parameters:
*******************

	* ``release_group_parameters``:  *<optional>*
		Description: - In development: release group specific particle prop params

		- a list containing type:  ``[]``
		- default list : ``None``
		- data_type: ``<class 'str'>``
		- possible_types: ``[]``
		- make_list_unique: ``False``
		- min_len: ``0``